Air conditioner controller

Controller for an air conditioner unit

manufacturer: ACOND models: AS-12UR4SYDDA, AS-09UR4SYDDA

IR receiver and display module

connected to main unit via 5 wires:

• YK (orange)
• KEY (yellow)
• SDA1 (greenish)
• +5V (blue)
• GND (purple)

JST-SM 2.5mm connector, male connector view from the key side, cables going up: leftmost = gnd

• YK and KEY seems to be high (5V) all the time, except for some noise spikes
• SDA1 carries a signal, repeating slightly faster than 1Hz, presumably bidirectional, since the front unit needs to know the current temperature.single pulse is 5/6ms. i.e. 1.2kHz

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