This is a device that can capture the IR signal from most remote controls and send the information via serial port to a computer for display. It provides all the vital information such as on/off durations, pulse counts, and carrier frequency. The captured information can be use to aid development of microcontoller code to respond to or transmit IR codes.
This circuit makes use of LEDs for more that just an indicator. They are also used as a voltage regulator and as an IR detector.
Step 1: Parts and Schematic
Blue LED with Vf of 3.0 to 3.3
Green LED with Vf of 2.0 to 2.2 (not ultra-green or true-green)
Red LED with Vf of 1.8 to 2.0
Infrared LED with wavelength of 940 or 950 nm
1N4148 or similar diode
100 nF (0.1 uF) capacitor
Microchip PIC 12F629 microcontroller
Female DE9 connector
Wire (solid core 20 awg)
PIC Programmer (PicKit 2 or similar)