Mems jobs

...webhooks to a custom website dashboard, with critical alerts natively triggering SMS notifications. Key Hardware & Firmware Deliverables: Low-Power Firmware Development: Program the microcontroller to remain in deep sleep, waking instantly via a hardware interrupt (leak sensor) or via a scheduled monthly timer (self-test). Sensor Integration: Interface a physical leak detector and an ultra-low-power MEMS microphone (for audible or ultrasonic mechanical failure signatures) with the main board. Edge Processing (FFT/Edge AI): Implement lightweight local audio processing (e.g., Fast Fourier Transform or a TinyML model via Edge Impulse) so the device analyzes sound profiles locally and only transmits compact frequency/anomaly metrics rather than raw audio streams. Battery Mon...

...needed). - Tip + shaft are removable stainless steel and contain no wiring. ## Form factor - Handle roughly pen-sized (about 12–16 mm diameter), balanced so it feels like a normal handheld instrument. - Tip stays slim (comparable to a fine probe pin). - Total length and weight kept close to a standard handheld probe. ## Suggested starting components (open to substitution) - Force sensor: small MEMS force sensor or micro compression/button load cell. - Signal conditioning: HX711 or ADS1220 ADC. - Controller with wireless: Seeed Xiao ESP32-C3 or nRF52840 (BLE). - Power: small rechargeable LiPo (100–150 mAh) with onboard charging. - Feedback: RGB LED + small coin vibration motor. ## Deliverables 1. Working prototype: probing tip + sliding shaft + force sensor + electr...

Please Sign Up or Login to see details.

Please Sign Up or Login to see details.

...projectiles passing through a target plane by capturing their shock wave. It uses eight high-bandwidth MEMS microphones (digital I2S output, 80 kHz frequency range) arranged in a diamond/plus-shaped mechanical frame. By precisely measuring the arrival time differences (TDOA) of the shock wave at each microphone, the system calculates the projectile’s speed and its exact intersection point with the sensor plane. This point is then projected onto a virtual target to determine the hit coordinates, score, and hit/miss status. All results are transmitted wirelessly (LoRa or WiFi) to a mobile device or scoreboard in real time. System architecture: 8 satellite microphone PCBs, each housing one digital I2S MEMS microphone, mounted at fixed positions on a foldable frame...

The primary challenge in MEMS readout design is capturing microscopic, sub-femtofarad variations in sensor capacitance without the signal being overwhelmed by parasitic noise or electrical interference. While a front-end switched-capacitor (SC) network is highly effective for this capacitance to voltage conversion, its resolution is heavily limited by the non idealities of the internal amplifier. Dynamic amplifiers offer an excellent solution for low-power operation, but they suffer from severe gain variations and performance degradation when moving from theoretical models to practical hardware realization. Key Objectives of this Work: 1. SC Circuit Optimization: Design a switched-capacitor network capable of detecting sub-femtofarad changes while minimizing background noise. 2. Amp...

...OPTICAL SPECTROSCOPY Hamamatsu C12880MA MEMS spectrometer (SPI). Multi-wavelength LED driver: 4 channels (405 / 530 / 625 / 850 nm), sequential, PWM-controlled, current-regulated ±1%. SMA905 fiber optic connector. This project centres on a single-board solution that brings electrical impedance spectroscopy and optical spectroscopy together for chemical and wet-lab work. The heart of the design is a precision 4-wire analog front-end that must resolve phase-angle bioimpedance from 100 mHz up to 200 kHz with very low drift and noise. That accuracy takes priority over every other subsystem, so component choice, guard routing, Kelvin connections and calibration hooks all need special care. Beyond the impedance path, the board has to host a Hamamatsu C12880MA MEMS spe...

...OPTICAL SPECTROSCOPY Hamamatsu C12880MA MEMS spectrometer (SPI). Multi-wavelength LED driver: 4 channels (405 / 530 / 625 / 850 nm), sequential, PWM-controlled, current-regulated ±1%. SMA905 fiber optic connector. This project centres on a single-board solution that brings electrical impedance spectroscopy and optical spectroscopy together for chemical and wet-lab work. The heart of the design is a precision 4-wire analog front-end that must resolve phase-angle bioimpedance from 100 mHz up to 200 kHz with very low drift and noise. That accuracy takes priority over every other subsystem, so component choice, guard routing, Kelvin connections and calibration hooks all need special care. Beyond the impedance path, the board has to host a Hamamatsu C12880MA MEMS spe...

...OPTICAL SPECTROSCOPY Hamamatsu C12880MA MEMS spectrometer (SPI). Multi-wavelength LED driver: 4 channels (405 / 530 / 625 / 850 nm), sequential, PWM-controlled, current-regulated ±1%. SMA905 fiber optic connector. This project centres on a single-board solution that brings electrical impedance spectroscopy and optical spectroscopy together for chemical and wet-lab work. The heart of the design is a precision 4-wire analog front-end that must resolve phase-angle bioimpedance from 100 mHz up to 200 kHz with very low drift and noise. That accuracy takes priority over every other subsystem, so component choice, guard routing, Kelvin connections and calibration hooks all need special care. Beyond the impedance path, the board has to host a Hamamatsu C12880MA MEMS spe...

...for an end-to-end solution: compact hardware layout, firmware that captures rotation data at a useful sampling rate, low-latency Bluetooth communication, a basic cross-platform app for iOS and Android to display live graphs/logs and a big on-screen “Vibrate” button, plus clear assembly files so I can have additional units manufactured. If you have existing experience with BLE, haptic drivers, or MEMS gyroscopes/IMUs, that will help us move fast. Deliverables: • Schematic, PCB files, and BOM • Embedded code flashed and tested • Mobile app source and installable builds • One fully assembled, demonstrated prototype • Short setup and usage guide I will review against stable Bluetooth connectivity, accurate rotation readouts, and respons...

...Document). Key Responsibilities: Schematic capture and Multi-layer PCB Layout design (Target dimensions: within 60x80mm, ultra-thin profile). Integration of Rockchip RV1106 SoC with 8GB eMMC and a 4G LTE modem module. Integration of an I2S audio amplifier (MAX98357A or equivalent) optimized for a high-power inductive coil output. Implementation of a dual-microphone setup (onboard MEMS + wireless receiver circuit) and BLE/2.4GHz links for external modular switches. Optimization for high-density 3.7V Li-Po battery placement and proper thermal dissipation mapping (graphene/copper insulation). Delivering production-ready Gerber files, BOM (Bill of Materials), and CPL files. Requirements: Proven experience with ARM Cortex/Rockchip SoC hardware design...

I have an upcoming product launch and want a series of eye-catching promotional posts tailored specifically for Instagram. The goal is to build anticipation, spotlight key product features, and drive traffic to the launch page on release day. Here’s what I need from you: • 4–6 video ugc videos creatives i want like creative viral video ready for feed placement • 2 complementary 1080 × 1920 px story frames to tease the launch • Short, punchy captions (≈150 characters each) with relevant hashtags • Layered source files (PSD, AI, or editable Canva links) so my team can tweak text later if required Creative direction – Bold, modern visuals that align with our current brand palette (HEX codes and logo files will be provided). – C...

I’m building a tiny, low-profile board—roughly Apple AirTag size—that understands basic voice commands, confirms them with short beeps, and runs entirely from a single CR2032 coin cell. Here’s what I need: • A complete schematic and PCB layout that integrates a low-power voice-recognition IC, an electret or MEMS microphone, and a miniature speaker or ringer tuned for clear beep tones. • Power architecture that keeps quiescent current ultra-low so the CR2032 lasts months, with attention to battery-friendly regulators or boost circuitry if the audio path needs higher voltage. • Component selection guidance; I’m flexible on the exact chipset and audio transducer as long as the overall package stays compact and readily sourced. &bul...

...embedded eSIM support for Jio / Airtel and a GNSS solution that delivers standard 5–10 m accuracy are required. The device must perform reliably both indoors and outdoors. Key elements you will integrate: • Cellular: LTE-M / NB-IoT modem with eSIM footprint pre-provisioned for Indian networks. • Positioning: GNSS (GPS + GLONASS) with a chip or flex PCB antenna that fits the size envelope. • Sensing: MEMS microphone capable of local audio recording to at least 128 MB on-board flash, plus an accelerometer for motion events. • User input: Single, double, and triple-press button detection implemented in hardware with clean debounce. • Power: Li-Po management, magnetic charging pads, and a deep-sleep regime that delivers weeks of standby and hours of ac...

...Mid-mount USB-C plug (sunk into PCB to minimize total Z-height for an 8mm enclosure goal). Privacy/UI: 1x Physical Slide Switch (to hardware-disconnect power to the mics) and 1x WS2812B-2020 RGB LED for status feedback. Control: 2x micro SMD tactile buttons (BOOT/RESET). Engineering & Audio Requirements Acoustic Pathing: Design proper unplated through-holes (min 0.5mm) for the bottom-ported MEMS microphones. Mics must be placed at opposite ends of the 35mm length to optimize Acoustic Echo Cancellation (AEC). Thermal Logic: The BME690 must be thermally isolated from the ESP32 and LDO via PCB cutouts/milled slots to ensure accurate ambient temperature readings. Power Design: N-Channel MOSFET drivers for IR LEDs powered directly from the 5V line for maximum range. Layout:...

Freelance IMU Data Analyst — Ground Truth Validation & Filter Design (BLE Wearable / MEMS IMU) Engagement: Freelance / Contract (remote) Duration: 3–4 weeks Budget: open to fixed-price or hourly proposals Start: immediate ──────────────────────────────────────── ABOUT THE PROJECT ──────────────────────────────────────── We are developing a Bluetooth-LE wearable that streams 9-DOF IMU data over BLE in a fixed 68-byte packet. The firmware runs in two parallel configurations that must produce equivalent output: • Configuration A — Bosch BHI260AP: 6-axis IMU + magnetometer with on-chip sensor fusion (BHY2 virtual sensor engine), sampled at 17 Hz. • Configuration B — Bosch BMI323: 6-axis IMU only, with a Mahony filter running on the MCU for orie...

I need a single 2-layer PCB designed, fabricated, and assembled for a compact ultrasonic microphone jammer demo unit. The device emits a frequency-modulated 24–26 kHz ultrasonic signal that disrupts MEMS microphone recording on nearby phones. This is a privacy/anti-eavesdropping demo unit. The circuit design, schematic, netlist, and firmware are ready — I need PCB layout, fabrication, and assembly. What I Have (Will Be Provided) Complete circuit schematic (PDF, A3) Netlist with all connections and component references Bill of Materials with exact part numbers and footprints Firmware source code (Arduino .ino for ESP32-C3 Super Mini) Reference design from open-source project (mcore1976/antispy-jammer on GitHub) Circuit Summary Signal chain: ESP32-C3 Super Mini → AD98...

...vibration-based condition monitoring solution in place for our industrial machinery. The system must continuously read and log RPM, displacement, and acceleration, then publish the data to a web dashboard where trending, thresholds, and automatic alerts can be configured in real time. Here is what I already have and what I expect from you: • Sensors & acquisition: I can source standard piezo or MEMS accelerometers and an RPM pickup, but I need guidance on the optimal sensor grade, mounting positions, and a compact DAQ (Raspberry Pi, ESP32, NI cDAQ, or similar—open to your recommendation) capable of simultaneous sampling. • Connectivity & protocol: Data has to leave the shop floor securely. MQTT or REST over Ethernet/Wi-Fi is acceptable; if you favour a...

I need a compact 2-4 channel analog MEMS microphone array built around an XMOS processor. The board must perform real-time beamforming, echo-cancellation and noise-suppression, then expose a clean audio output through straightforward header pins so it can be patched into downstream hardware without fuss. Size matters here: the smaller the PCB, the better. I’m expecting you to handle the full hardware cycle—schematic capture, PCB layout, component selection and a ready-to-order BOM—plus the XMOS firmware that brings the DSP features to life. Your code should compile and run on the free tools from XMOS; please include any scripts or tuning utilities you rely on. Deliverables • Production-ready Gerbers, pick-and-place file, annotated schematic • BOM wi...

...monitoring devices. Need exact compaby and specification and to which cloud platform as well as dashboard it would be fit for AI monitoring remotely. No ChatGPT answer please - I want someone who have actually worked on it or knows end-to-end. Next: Sensors + Edge device + AI software - which one to use and how? Wireless Vibration Sensors; Motor Condition Monitoring Advanced Sensing Technology (MEMS & Piezoelectric sensors) gathering precision data Next: How to use - existing IoT dashboards, ThingsBoard or anything convenient? direct integration with Programmable Logic Controllers. It ensures rapid data collection from machine-level control systems, enabling real-time visibility and performance insights. which industry such as Auto/food/pharma to be choose and why? Global...

...gyroscope sensor. I want to receive both the electrical schematic and a finished PCB layout matching my concept and the dimensions according to a drawing I will send. What must be included in the design: • A power supply module operating in the range of 9–24 V DC, protected against overvoltage and reverse polarity. • A communication interface and a programming connector for the ESP32 • Integration of MEMS sensors (accelerometer / gyroscope – the exact model will be agreed after the work starts). • A CAN-BUS interface with a transceiver suitable for industrial environments at 3.3 V. Expected final deliverables: 1. Schematic in KiCad, Altium, or Eagle format (to be agreed). 2. PCB layout with EMC rules applied and a silkscreen/annotation layer. ...

...the Heltec WiFi LoRa 32 V3 (to simplify assembly). Please specify your recommendation in your proposal. Sensors (Interfaces needed for 2 Hives): Weight: 2x Interfaces for Load Cells (4-wire). The PCB must integrate 2x HX711 ADC chips directly (or provide headers for breakout boards, though integrated chips are preferred for reliability). Audio: 2x Interfaces for external I2S MEMS Microphones (e.g., INMP441). Connectors must be pin-compatible. Temperature: Interface for 2x DS18B20 sensors (OneWire). Power Management: Input for 6V Solar Panel. Battery management for 18650 Li-Ion or LiFePO4. Efficient charging IC (e.g., CN3065 or similar appropriate for solar). Crucial: Ultra-low power consumption optimization ...

...• Conceptual architecture for a microscopic machine (think MEMS/NEMS scale) dedicated to quality control measurements. • 3D CAD model with tolerances suitable for lithography or micro-machining. • Simulation or analytical validation showing expected performance, accuracy, and repeatability. • A concise bill of materials and recommended fabrication process flow. • Assembly and calibration guidelines so a research technician can reproduce your design in-house or at a micro-fabrication foundry. Experience with COMSOL, SolidWorks, Ansys, or similar multiphysics tools is highly valued, and familiarity with clean-room fabrication constraints will make your proposal stand out. Please include examples of previous microscopic or MEMS devices you&rs...

...power constraints suitable for wrist-worn devices. This is not a Raspberry Pi project and not cloud-based AI. Scope of Work (What You Will Do) 1. SOM Integration Planning Review Thundercomm W5+ Gen 2 SOM documentation Define: Power requirements Required PMIC connections Boot configuration Identify minimum external components needed for a wearable design 2. Audio System Design Specify: MEMS microphone configuration (I2S / PDM) Speaker + amplifier solution suitable for a watch Ensure compatibility with: Linux / Android audio stack Low-power voice use 3. Thermal Strategy (Critical) Design for burst AI workloads only Ensure: No continuous high-power operation Heat is spread laterally (bezel/mid-frame) Skin-side thermal isolation Recommend: Temperature sensors ...

...Espressif Audio Front-End (AFE) features, such as: - Acoustic Echo Cancellation (AEC) - Noise Suppression (NS) - Automatic Gain Control (AGC) - (Optional / desirable) WakeNet or voice trigger support Establish bidirectional audio streaming via I2S between: - ESP32-S3 ↔ Raspberry Pi - Ensure low-latency, stable audio suitable for real-time VoIP - System Architecture (High-Level) Microphone input: MEMS I2S microphone connected directly to ESP32-S3 Playback reference: Audio playback stream from Raspberry Pi provided to ESP32-S3 as AEC reference (via I2S) Processed output: ESP32-S3 sends filtered/processed microphone audio back to Raspberry Pi via I2S Raspberry Pi: Handles SIP/VoIP, networking, codecs, and call logic (already implemented) Only consumes and provides raw PCM...

...Play, pause, skip, and volume adjustments must work through three parallel input methods—capacitive touchscreen gestures, voice commands, and tactile side buttons. No health tracking or notification features are required at this stage, but the architecture should leave room for them later. What the work involves • Hardware: board layout, component selection (BLE-enabled SoC, microphone array or MEMS mic, haptic motor driver, battery management, low-profile tactile switches, 1.4-1.6" touchscreen), enclosure fit for small-batch 3-D printing or CNC. • Firmware: real-time OS or bare-metal code that handles Bluetooth AVRCP, low-power states, touch controller, physical button debounce, and hotword or on-device voice recognition hooks. • Companion app st...

Overview We are building a rugged field recording system composed of multiple submodules. This project covers only the audio capture + local storage submodule, which will be controlled by a separate master MCU. Your task is to design a low-cost PCB module that: • Captures ≥120 seconds of mono audio from one waterproof MEMS microphone • Stores the audio locally in serial flash as a WAV file • Exposes a simple digital interface so a master MCU can control recording and download audio data All triggering, power management, communications, and backend handling are performed elsewhere and are out of scope. In-scope requirements Electronics design / mechanical / form factor • Small PCBA dedicated to audio + memory o PCB outline provided • 2 × mounting h...

Please Sign Up or Login to see details.

...Play, pause, skip, and volume adjustments must work through three parallel input methods—capacitive touchscreen gestures, voice commands, and tactile side buttons. No health tracking or notification features are required at this stage, but the architecture should leave room for them later. What the work involves • Hardware: board layout, component selection (BLE-enabled SoC, microphone array or MEMS mic, haptic motor driver, battery management, low-profile tactile switches, 1.4-1.6" touchscreen), enclosure fit for small-batch 3-D printing or CNC. • Firmware: real-time OS or bare-metal code that handles Bluetooth AVRCP, low-power states, touch controller, physical button debounce, and hotword or on-device voice recognition hooks. • Companion app st...

أحتاج إلى إعداد محتوى جذاب لمنصات التواصل الاجتماعي في أسرع وقت ممكن. المطلوب هو صياغة منشورات قصيرة تلائم طبيعة علامتي التجارية، مع مراعاة الأسلوب السلس الذي يشجع التفاعل ويحفز المشاركة. التفاصيل الأساسية - نوع الخدمة: كتابة المحتوى - نوع المحتوى المطلوب: منشورات على وسائل التواصل الاجتماعي - الإطار الزمني: ‎ASAP‎ ما أنتظره ضمن التسليم • نصوص أصلية وجاهزة للنشر (بتنسيق .docx أو .txt) • لغة عربية فصيحة مع لمسة ودية تناسب الجمهور على المنصات المختلفة • مراعاة عدد الأحرف المثالي لكل منصة (مثل تويتر، إنستغرام، فيسبوك) • اقتراح وسوم ‎#‎Hashtags‎ ملائمة عند الحاجة سيُراجَع النص للتأكد من خلوه من الأخطاء الإملائية والاقتباس غير المصرح به، وبأن الرسالة التسويقية واضحة ومختصرة. بمجرد الموافقة على الصياغة النهائية، يُعتبر المشروع مكتملً...

...wrist-mounted control module housing microphones, compute, battery, and wireless links The control unit must continuously capture ambient speech, run low-latency AI processing, and stream its voice response back to the earpieces so both voices (ambient and assistant) play simultaneously. Project scope covers electronics, firmware, enclosure design, and a lean software stack. Expect to lean on MEMS mic beam-forming, Bluetooth LE Audio, low-power DSP, and on-device inference with TensorFlow Lite (or an equally efficient alternative). Cloud fallback for heavier language tasks is fine, provided end-to-end latency stays under 300 ms. Acceptance criteria • Speech-to-insight-to-ear latency ≤ 300 ms • Wrist module diameter 38–40 mm with modular mounting plate •...

...wrist-mounted control module housing microphones, compute, battery, and wireless links The control unit must continuously capture ambient speech, run low-latency AI processing, and stream its voice response back to the earpieces so both voices (ambient and assistant) play simultaneously. Project scope covers electronics, firmware, enclosure design, and a lean software stack. Expect to lean on MEMS mic beam-forming, Bluetooth LE Audio, low-power DSP, and on-device inference with TensorFlow Lite (or an equally efficient alternative). Cloud fallback for heavier language tasks is fine, provided end-to-end latency stays under 300 ms. Acceptance criteria • Speech-to-insight-to-ear latency ≤ 300 ms • Wrist module diameter 38–40 mm with modular mounting plate &b...

...four-throw) MEMS switch and am now moving into detailed work. My immediate need is a clear, manufacture-ready schematic that translates the concept into a layout I can take to fabrication with minimal rework. What I’m looking for • A clean, rule-checked schematic capturing all layers, anchors, beams, contact pads, and actuation structures. • A concise mask-layer map that shows how each layer in the schematic will translate to photomasks. .Fabrication and results • A short fabrication note (materials, key steps, and critical dimensions) so I can verify feasibility with my foundry before committing to full masks. Tools are flexible—as long as the final files export reliably to standard GDSII or DXF, I’m happy. If you already work in AutoCAD, So...

I have a XIAO BLE nRF52840 board (21 × 18 mm) with a MEMS microphone that needs to live inside a sleek, rectangular plastic pendant. Your task is to create the full 3D model so I can move straight to printing or injection-molding. The overall look should stay clean and minimal—no decorative flourishes, just smooth lines that highlight the rectangle. Internally, the PCB must sit snugly while leaving a small acoustic opening for the mic and enough clearance for its components. Please add a simple way to attach a chain or cord and design the halves (or cover) so assembly and future access are hassle-free. Deliverables: • Editable CAD file (STEP or similar) • Ready-to-print STL • A brief note on recommended tolerances and assembly method I’ll gi...

The item is of urgent need. My MEMS-microphone circuit is picking up a constant, low-level hum that blankets the entire recording. I have ruled out obvious grounding mistakes and loose cables, yet the static remains, so I’m looking for a fresh set of expert eyes—and ears—to pinpoint the culprit and guide me to a clean signal path. You’ll work from the schematic and board files I provide, walk me through any layout or component-level tweaks, and suggest practical tests I can run on the bench (scope, spectrum analysis, simple A-weighted measurements—whatever gives us clarity). I’m happy to share recorded samples and scope screenshots so you can hear exactly what I’m hearing. The goal is straightforward: identify the source of the hum, recomm...

...project in our university masters research. Project Overview: We're building modular data acquisition hardware for recording environmental parameters. This is one module in our testing setup that needs to interface multiple sensors simultaneously. Technical Requirements: Sensors to Interface: 1x ADXL355 3-axis accelerometer (SPI interface) 4x DS18B20 temperature sensors (OneWire protocol) 1x I2S MEMS microphone interface (INMP441 compatible) Connectivity: Standard 20-pin IDC header with following signals: Power inputs: 3.3V, 5V, GND SPI: MOSI, MISO, SCK, CS I2C: SDA, SCL OneWire data line I2S: WS, SCK, SD 2x GPIO for interrupts The 20-pin header should follow standard ribbon cable pinout with pin 1 clearly marked. Board should be designed to work as a standalone unit or ...

...Electronics are split into 5 parts. 1. Head Unit 2. Belly Unit 3. Interconnect Cable 4. Charging Station 5. Sleeping Sack 1. Head Unit Purpose: Handles processing, audio input, vision, and AI logic. - RK3566 SoC (or RK3576 upgrade) – main processor for AI and system control - 2x TTC016VRS-02C 1.6" MIPI TFT LCDs – animated eyes - MIPI Camera – visual sensing for interaction - 4x ICS-43434 Digital MEMS Microphones – far-field voice pickup - TLV320ADC3140 – multichannel audio ADC - LPDDR4 RAM (2GB) – memory for running AI models - eMMC Flash or RS70B64S16G – OS and data storage - LSM6DS3TR-C IMU – motion and orientation sensing - USB302BMPX – USB interface for development/debug - AP6212 or equivalent Wi-Fi/Bluetooth module...

...Electronics are split into 5 parts. 1. Head Unit 2. Belly Unit 3. Interconnect Cable 4. Charging Station 5. Sleeping Sack 1. Head Unit Purpose: Handles processing, audio input, vision, and AI logic. - RK3566 SoC (or RK3576 upgrade) – main processor for AI and system control - 2x TTC016VRS-02C 1.6" MIPI TFT LCDs – animated eyes - MIPI Camera – visual sensing for interaction - 4x ICS-43434 Digital MEMS Microphones – far-field voice pickup - TLV320ADC3140 – multichannel audio ADC - LPDDR4 RAM (2GB) – memory for running AI models - eMMC Flash or RS70B64S16G – OS and data storage - LSM6DS3TR-C IMU – motion and orientation sensing - USB302BMPX – USB interface for development/debug - AP6212 or equivalent Wi-Fi/Bluetoo...

...software developer to help build a compact voice recording device that can continuously record high-quality audio for 15 to 30 days on a 2000mAh battery. The device should be optimized for low power consumption and designed for long-duration field use. ⸻ Project Requirements Hardware Design: • Selection of a low-power microcontroller (e.g., ESP32, ATmega, STM32) • Integration of a high-quality MEMS or electret microphone • Onboard storage via SD card or internal flash (minimum 10GB recommended) • Power-efficient circuit design to maximize battery life Firmware Development: • Record audio in a compressed format such as IMA ADPCM, MP3, or Opus • Efficient SD card or flash storage management (including file chunking and timestamps) • Use...

...Filter for CT 1kΩ + 100nF 0805 3 Filters CT signal # Component Model/Series Package Qty Description 16 Logic Level MOSFET IRLZ44N or AO3400 TO-220/SOT23 3 Controls siren/relay 17 Relay 12V SPDT - 1 Controls external device 18 SWD Debug Header 4-pin 2.54mm Header 1 For flashing/debugging via ST-Link 19 Buzzer (Optional) 3.3V/5V Buzzer Through-hole 1 Audible local alert 20 Microphone (optional) Digital MEMS (I’S) - 1 Audio input for environment sound monitoring 21 Speaker Driver + Speaker MAX98357A + 8¿ Module 1 Audio output for alarms 22 Power Supply Regulator LM2596 or similar Module 1 12V/5V to 3.3V/5V supply 23 Capacitors (Bypass, bulk) 0.1uF, 10uF, 100uF 0805 20 Power stability 24 LEDs (Status Indicators) Green, Red, Blue 0805 3 Status indication (Power, Fau...

...states of device • Able to process signals and run encryption algorithms Includes a durable, compact, aesthetically pleasing enclosure that's easily openable, and a servo motor that extend and retracts a metallic shaft. Allows easy software development and testing by me (plug-and-code simplicity). Job Details 1. Custom PCB Design: • Embedded microcontroller (ESP32 or STM32) • Audio Components: o MEMS microphone (I2S) o Audio amplifier (MAX98357 or similar) for speaker output • Communication/Programming Interface: o USB-C port exposed inside casing for easy code upload, debugging, and updates • Power Management: o Rechargeable battery circuit o Voltage regulators/stabilizers (3.3V or 5V depending on MCU) o Measure battery voltage via analog to digit...

Schematic showing MEMS microphone connection and SPI connection to STM32H7 module

We are seeking a skilled PCB designer to develop a compact, high-quality audio recording circuit based on the ESP32 platform. The design will include a MEMS microphone array (3 or 4 microphones in a geometric configuration), with the goal of recording individual audio channels for post-processing such as beamforming and voice separation. Project Requirements: ESP32-based circuit design (ESP32-S3 or similar recommended) Support for 3 or 4 MEMS microphones (preferably I²S-compatible) arranged in a triangular or triangular + center layout Microphones must be sample-synchronized for post-processing Output to multi-channel digital audio stream via I2S (preferred) or optionally SPDIF Provision for microSD card storage of multi-channel WAV files Focus on high-fidelity voice c...

...and give real-time biofeedback 2. MEMS Microphone – to detect grinding noise during sleep 3. SpO2, Heart Rate (HR), and Heart Rate Variability (HRV) Sensor – attached to the earlobe 4. Vibration Motor (LRA) – to provide real-time feedback to the user 5. BLE Communication – for data transmission to a mobile application The main goal of the product is to monitor unconscious bruxism/clenching behaviors during sleep, provide feedback to users in real-time, and visualize the data through a connected app. 1. Sensor Configuration and Placement • EMG (Electromyography) Sensor: Attached to the temporal muscle to measure muscle contraction, enabling the detection of bruxism or clenching activities and electric real-time biofeedback using same wire &bu...

...the STM32H7 microcontroller. The system will collect audio from multiple MEMS microphones, process high-frequency audio, and stream data to an ESP32 for server transmission. The project includes hardware design, firmware development, and support for over-the-air (OTA) updates. Scope of Work Hardware Design for Multi-Microphone Audio Streaming Design hardware to interface up to 4 MEMS IM73D122V01 microphones with the STM32H7. Ensure robust audio data streaming with minimal latency and high signal integrity. Select appropriate MEMS microphones and supporting components (e.g., amplifiers, filters) compatible with the STM32H7. High-Frequency Audio Capture Design hardware to capture audio up to 80 kHz from a single MEMS microphone. Implement necessary analog ...

...preferred Optional: 3D board rendering and assembly drawings Hardware Specs: MCU: ESP32-S3 (with native USB support) Display: Circular touchscreen SPI display (~1.28"–1.4") Charging: USB-C port + BQ24074 (LiPo charging and power path) Battery: 3.7V LiPo (via JST or similar connector) Flash: W25Q32 or W25Q64 (SPI) RTC: DS3231 with onboard crystal and coin cell backup Vibration motor: coin-style MEMS Microphone: SPH0645 (I²S) or INMP441 Push button: single tactile input Sensors: MAX30102 (HRM/SpO2) DS18B20 (body temp) MPU6050 (IMU) GSR sensor (analog or module input) SHT31 (humidity/temp) MAX44009 (ambient light) Optional: BMP280 (barometric pressure), CCS811 (air quality/gas) Requirements: Experience designing wearable/wrist-mounted electr...

...and give real-time biofeedback 2. MEMS Microphone – to detect grinding noise during sleep 3. SpO2, Heart Rate (HR), and Heart Rate Variability (HRV) Sensor – attached to the earlobe 4. Vibration Motor (LRA) – to provide real-time feedback to the user 5. BLE Communication – for data transmission to a mobile application The main goal of the product is to monitor unconscious bruxism/clenching behaviors during sleep, provide feedback to users in real-time, and visualize the data through a connected app. 1. Sensor Configuration and Placement • EMG (Electromyography) Sensor: Attached to the temporal muscle to measure muscle contraction, enabling the detection of bruxism or clenching activities and electric real-time biofeedback using same wire &bu...

I need a comprehensive, detailed, and visually appealing research article on 'MEMS devices for harvesting energy from body movements.' The article should be 6-8 pages long and is intended for an audience of academic researchers. The article should cover: - Technical specifications and innovations - Applications and case studies - Challenges and future research directions Deadline is April 30th, midnight. Ideal skills and experience: - Strong background in MEMS technology and energy harvesting - Excellent research and writing skills - Ability to create visually appealing layouts - Experience writing for an academic audience - Least amount of AI usage is preferred

Proposal Provide a rational of the feasibility to design an estimator of the speed of a land vehicle, only based on an inertial sensor (aka IMU, inertial measurement unit) of the MEMS class (micro electro-mechanical system).

...prototype board. After completing the prototype test, the developer must send me at least three boards to test by myself. The hardware design must consider hardware and firmware (software) limitations. If the person has better ideas about components, firmware, or anything else, I have no problem following their advice. MCU unit: Sensor unit: Programming language: C / C++...