Use an esp8266 with a photoresistor and a IR transmitter to allow network control of an aircon
You will need to make a file network_conn.h with contents similar to
const char* ssid = "your-ssid";
const char* password = "your-wpa-passwd";
const char* mqttServer = "your-MQTT-server";
const int mqttPort = 1883;
in order to provide details of your network and MQTT server
This code is to make a dumb air-con semi smart.
The idea is to use a photoresistor to detect if there's an
LED lit on the control panel. This means the aircon is "on".
(we can't use power-draw 'cos the aircon has ECO mode, so
it may be "on" but not drawing power.)
We also have a IR transmittor. So we can send the POWER
message to remotely turn on/off the aircon.
We connect to an MQTT server and send on a status channel the
state of the aircon (ON/OFF) every second, and we listen to a
control channel to receive commands
POWER ON (turn on aircon; only sends IR signal if state is OFF)
POWER OFF (turn off aircon; only sends IR signal if state is ON)
POWER (always send IR signal)
The MQTT channels are based off the word "aircon" and the last 6 digits of the MAC
e.g aircon/123456/status
aircon/123456/control
aircon/123456/debug
Uses PubSubClient and IRremoteESP8266 libraries on top of the ESP8266WiFi one
On my NodeMCU
Connect the photoresister between A0 and 3V3
Connect a 10K resister between A0 and GND (to pull-down)
Connect the IR transmitter between D2 and Gnd (IR diode + goes to D2)
My Aircon is a Friedrich CP24F30, so the IR code embedded is
the power signal for that.
See https://github.com/markszabo/IRremoteESP8266 if you want to learn your
own IR message
GPL2.0 or later. See GPL LICENSE file for details.
Original code by Stephen Harris, May 2019