Hampton Bay Air Conditioner IR Remote Control Reverse Engineer


Posted on Feb 6, 2014

Electronics Nerd shows us how to reverse engineer an IR remote control signal. By understanding what type of signal is being transmitted out of the remote control allows a microcontroller to simulate the code to control the Hampton Bay Air Conditioner. `In the NEC protocol, the initial start pulse prepares the receiver IC for a data transmission a


Hampton Bay Air Conditioner IR Remote Control Reverse Engineer
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t a particular rate, adjusting its AGC circuitry for the signal level excursions of what is to follow. After the standard 9ms equalization pulse, there`s a 4. 5ms pause, and the receiver then accepts data at a predefined baud rate. If one weird spike were to occur at a particular moment during the transmission, the air conditioner might turn off instead of lower the setpoint temperature of the unit, without a means for detecting glitches in a transmission. Simple error checking like this provides for disallowing invalid input, while providing near-failsafe transmission of valid control data. "




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