Hampton Bay Air Conditioner IR Remote Control Reverse Engineer

  
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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 - schematic

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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