In Progress

Design A Timing / Speed Circuit

I am building a speed detection system using laser gates but I need a schematic designed for me that will show me how to build this and what chips and other electronic devices I will need. I did find an existing design online which I am basically going to copy except I need some modifications made to this design. Here is a link to the design I found.....

[url removed, login to view]

HOWEVER....I do not want to display / record the time.... I want to display Miles Per Hour (mph). So, for the schematic that is shown in the above mentioned link, I would like an extremely accurate timing circuit instead of the stopwatch he uses in his design. I believe a crystal oscillator will be required for this but I am open to your suggestions. I would like this device to be extremely accurate so I am assuming the timing circuit will need the ability to time in 1/1000th of seconds. I need this circuit to calculate the mph based off the time recorded and distance between "Point A" and "Point B". Here is my explanation in simpler terms....

1. I want a laser and photo-sensor at "Point A". When an object passes through this laser beam, it should start the timer.

2. I want a laser and photo-sensor one inch away from "Point A" which I will call "Point B". When the object passes through "Point B" it needs to stop the timer.

3. I then need this circuit to take the time recorded for the object to pass from "Point A" to "Point B" and calculate the MPH. I would like the MPH reading to display on a 3 digit LED number display.


The max speed of objects passing through the beams will be no faster then 150mph. I would like the MPH reading to remain displayed on the LED display until another object passes through "Point A" & "Point B" which time the new MPH reading will show up on the display. I would like this to be a battery operated circuit. Please give me your quote for the DESIGN schematic only. I do not need you to physically build this circuit. I can build it and test it myself.

Skills: Circuit Design, Electronics, PCB Layout

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( 2 reviews ) Hastings, United States

Project ID: #5541481

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Hi! Suggest using Arduino. Here units that you need: - Mega-2560-R3-Mega2560-REV3-ATmega2560-16AU-Board - LCD-Keypad-Shield-LCD1602-LCD-1602-Module-Display - LM2596-BUCK-DC-DC-adjustable-high-efficiency-of- More

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+10 years experience in electronics designs. Developed several systems in industrial field. Used most of measurement sensors. I hope i can help you :)

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I have big experience with microcontrollers and digital schematics. So I can do this. Especially since it is a simple project.

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