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Project

NEC IR Protocol Encoder/Decoder with PIC16F150X Timer1 Gate signal capture (MPLAB XC8, mikroC, mikroBasic)

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Author: Ghanshyam Patel

Last Updated: 2016-02-18

Package Version: 1.0.0.0

Category: Communication

Downloaded: 4159 times

Followed by: 1 user

License: MIT license  

A project to encode (remote) and decode (receiver) InfraRed signals using the NEC protocol. It uses the Timer1 Gate function to continually capture the signal to reduce software load and gives it a fast response. The idea is to reverse polarity on the Timer1 Gate capture as soon as it interrupts so it can capture both the high & low signals.

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Project Blog

Protocol Information:

http://wiki.altium.com/display/ADOH/NEC+Infrared+Transmission+Protocol

NEC IR Protocol Decoder:

Decoding of the IR signal using the Timer1 gate (RA4) function on PIC16F150X microcontrollers to capture the signal with Timer0 used as a timeout indicator. The MPLAB XC8 version is fully tested. The mikroC version is only made for PIC16F1509 and its performance is terrible since it only decodes properly once in a while (reason unknown).

Not all remotes follow this protocol and even if they not the timings are not always the same. The code can be adapted for most remotes by modifying the decoding process in the interrupt function (underneath “LowValue = Timer1Value”).

NEC IR Protocol Encoder:

Very simple remote control IR signal simulation program for PIC18F14K50 on all PORTC pins in mikroBasic.

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