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IR decoder

Decodes long IR codes, for example from air conditioner / heat pump devices.

Shows the timings, the symbols, and also the decoded signal for certain air conditioners.

Required hardware:

• Arduino (any compatible will do, but Arduino Uno or Nano is easiest for prototyping)
• Infrared receiver, for example VS1838 will do fine, see also https://arduino-info.wikispaces.com/IR-RemoteControl
• Breadboard, wiring
• IR remote control from the aircon/heatpump you plan to decode

Build instructions

Defines for the different brands were introduced to limit the memory footage on a Arduino UNO. Uncomment, in the beginning of the sketch, the define for your remote brand. You will get a compiler error if you forget to uncomment!

• //#define MITSUBISHI_ELECTRIC
• //#define FUJITSU
• //#define MITSUBISHI_HEAVY
• //#define DAIKIN
• //#define SHARP_
• //#define CARRIER
• //#define PANASONIC_CKP
• //#define PANASONIC_CS
• //#define HYUNDAI
• //#define GREE
• //#define GREE_YAC
• //#define FUEGO
• //#define TOSHIBA
• //#define NIBE
• //#define AIRWELL
• //#define HITACHI
• //#define SAMSUNG
• //#define BALLU
• //#define AUX
• //#define ZHLT01_REMOTE
• //#define PHILCO

Arduino IDE

• Open the sketch from subdirectory 'rawirdecode' in Arduino IDE and build

PlatformIO

• platformio.ini contains build definitions for Arduino Mega, ESP32 (both tested on M5STACK ATOM LITE) and ESP8266 (tested on nodemcu)
• On Mega, connect the receiver data pin to GPIO 2
• On ESP32, connect the receiver data pin to GPIO 25
• On ESP8266, connect the receiver data pin to GPIO 5

Instructions

• Connect an IR receiver into the Arduino
• Start the sketch, and enter 1, 2, 3, 4 or 5 into the 'Serial Monitor', to select which timings to use
  • Try out the alternatives until you get sensible output
  • The signal should always start with 'Hh', and within the signal there should only be a couple of 'Hh' pairs (if any)
  • 'H' and 'h' should be there only in pairs 'Hh'
  • 'H' stands for 'header mark' and 'h' for 'header space'
• Point your IR remote to the IR receiver and send the code
  • If the symbols are known, then the decoder shows its meaning on the serial monitor
  • If the symbols are unknown, then you can help by writing a decoder for the unknown remote

-> Mode '9' can be used to decode known signals, in that case you can send the symbols from the terminal, like entering this:

Hh001101011010111100000111001001010100000000000111000000001111111011010100000001000111001011