Understanding IR Remote Protocols to build your own IR Signal Decoder using TSOP and PIC Microcontroller

This project functions by capturing infrared light signals sent from a standard NEC remote and translating them into readable data using a TSOP1838 IR Receiver and a PIC16F886 Microcontroller. When you press a button on the NEC remote, it emits a modulated burst of infrared light at a specific frequency. The TSOP1838 receiver detects this light, filters out ambient room illumination, and demodulates the signal into a clean digital pulse train. This stream of pulses is sent directly into the PIC16F886 microcontroller, which is programmed using the XC8 compiler within the MPLAB X IDE to measure the timing of the pulses and spaces. By interpreting the duration of these high and low states against the NEC protocol standards, the microcontroller decodes which specific button was pressed. Finally, the decoded data is transmitted serially via an FTDI UART module, allowing you to view the resulting commands on a computer terminal using jumper wires and a breadboard for circuit assembly. A 4.7K resistor is utilized in the circuit configuration to ensure proper pull-up or current-limiting behavior for reliable signal transmission and component protection.