In order to help his friend prepare for a talk at DEFCON this weekend, [Craig] built an IR photodiode amplifier circuit. The circuit extended the detection range of the hack from a few inches to ...

arduino UNO and Arduino MEGA 2560 and works (precision not tested) TODO: use pin change interrupt to allow every pin. TODO: integrate with pool controler to detect water flows through pH and ORP ...

This circuit is really simple and is only using a few components like a battery, an IR LED, photodiode, LM324 op-amp IC ... We made again the schematic from the Arduino schematic website. Before We ...