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 ...

IR photodiodes are connected in reverse bias as shown in the circuit diagram of the sensor module (Fig. 3). Anodes are commonly connected to the ground and cathodes are connected to the 5V via ...

Let's get started: The purpose of this circuit is to provide a visual indication by activating an LED whenever an object is placed in front of the IR LED and the photodiode. This circuit is really ...