File lennox.c runs on a pi and listens for IR commands directed at a Lennox minisplit
air conditioner.  It decodes them as info on-screen, prints the hex code packet, and
sends the hex code packet to my home automation controller where it is fully decoded
and used to keep track of the current internal state of the air conditioner.

(lennox.c uses a python program to capture the IR bits and their timings.  The
python code is embedded in lennox.c so all you need is python2 to execute it)

The home automation system also accepts commands for air conditioner control, from
various sources - the linux command line, a web page, or Alexa voice control.  It
assembles a remote control packet from the data in the command plus the knowlege
of the airco internal state, and sends the 5-byte control packet to a raspberry pi
located in the same room as the air conditioner, which in turn sends that packet
over IR to the airco, using send-lennox-code.c

The code in the home automation program that is relevant to the air condition has
been extracted and saved in encoder_decoder.c (but is not something you should
expect to use verbatim, it's just there as reference material for decoding and
encoding IR packets)

The IR receiver hardware I'm using is an off-the-shelf module bought at
Amazon: https://www.amazon.com/gp/product/B08X2MFS6S/

The IR transmitter is breadboarded from components:
PN2222 transistor
Vishay IR LED
2xresistors
- basically, the same as this: https://tasmota.github.io/docs/IR-Remote/

(home-made because the IR transmitter in the product via Amazon above was useless)


Any questions to gtoal@gtoal.com