You can read more for this project here (Bulgarian): http://f-e-n.net/ur

In my office I have some cheap AC named Chunlan which I want to operate remotly. So I make this IR remote control with ESP8266. It works via MQTT and also have WEB interafce.

Settings for MQTT and WIFI are in include/user_config.h.

IR protocol is like this:

 0 \ 11 Heat | 00 Cool
 1 / 10 Dry
 2
 3 - 1 On | 0 Off
 4
 5
 6
 7

 8 | Temp 9
 9 |
10 |
11 |
12 |
13 |
14
15

16 \ 00 Fan auto | 01 Fan 2
17 / 11 Fan 1    | 10 Fan 3
18
19 - Vane
20
21
22
23

Temp = Temp + 9

I try to use PWM, but I failed, so I make it with delays. You can see code in user/ac.c - ir_send().

You can use the following template and just set bits which you want: 000000000000000000000000001001001110000000000000000000000000000000110000

You can change settings via JSON and MQTT on topic /office/service/ac. And on /office/service/ac/settings you will receive new settings: {"power":"on","mode":"heat","temp":"18","fan":"3","swing":"off","dht_temp":"2000","dht_humid":"3900"}

You can get settings via JSON: curl -u user:pass http://ip.address/load.tpl {"power":"on","mode":"heat","temp":"18","fan":"3","swing":"off","dht_temp":"2000","dht_humid":"3900"}

You can set settings: curl -u user:pass http://ip.address/save.cgi?power=on&mode=heat OK

Valid settings are: power: on/off mode: heat/cool temp: 15-30 fan: 1/2/3/auto swing: on/off

This code was tested with ESP SDK 0.9.3.

Schematics is something like: http://alexba.in/blog/2013/06/08/open-source-universal-remote-parts-and-pictures/