Here is the diagram of my Arduino infrared close proximity sensor. As you can see, the core part of my experimental setup is an Arduino UNO, but other compatible microcontrollers can also be employed.

This circuit uses invisible ... people are moving. Two Infrared LEDs always emit continuous infrared beam to the Photodiode. The IR LEDs and Photodiode are placed on the opposite frames of the door ...

Messing around with Arduino can lead to some ... controlling the current in an electrical circuit. This is particularly important if your project uses LEDs, or is complex enough to otherwise ...

[Computergeek] made an Arduino Shield in order to use ... he should probably have invited a resistor to the party the two IR LEDs are having.

We love little tricks like this. Suppose that you want to generate an IR remote’s signal. It’s easy, because most of the codes are known. But it can be slightly harder because most IR remotes ...

Typically, reflective-type infrared ... circuit works off a 9-V dc supply and can be powered by a compact PP3/6F22-type battery. On power-up, current flows through resistor R1, and the LED inside ...