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JOB: High speed reflected light circuit

Ca4 Case

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High speed reflected light circuit / Adafruit Jobs Board. Maurice writes –

I’m looking for help to design a new Camera Axe sensor. Camera Axe is an open source project that I administer. I’ve designed most of the sensors myself, but this the one I have in mind would benefit from an EE with experience with differential amplifiers.

This new sensor would replace my existing projectile sensor(http://www.cameraaxe.com/wiki/index.php?title=Sensors#Projectile_Sensor). This new design would hopefully be cheaper and easier to use. The idea is to replace the 3 PCB design with a single PCB. On the PCB would be an IR LED to emit light in a fairly dark room, and an IR diode to detect reflected light from the bullet/projectile. The IR diode will need to act quickly. I’m looking for a 1 us or less response time, but it can be a little longer if needed.

I’m open to different designs, but the best idea I’ve had on how to do this was to have a differential amplifier to detect very small changes in the amount of IR light.

I’m looking for someone to help with the circuit design and recommend parts to use. Compensation would be $100 after I’ve verified a working circuit. In addition I plan to open source the design and give you appropriate credit.

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