Hacking Remote Control Light Switch PT2262 / AD2262

A project log for $10 Smart Home

Free and affordable smart home built using affordable off-the-shelf RC switches and hacking 'non-smart' appliances

p-tP. T. 02/13/2017 at 10:260 Comments

A typical inexpensive remote controlled switch remote is based on AD2262 chip, a clone of PT2262. Although a data sheet in Chinese can be found for AD2262, description of original PT2262 seem to have much more details about their application. Both data sheets are available in the project files.

"PT2262 is a remote control encoder paired with PT2272 utilizing CMOS Technology. It encodes data and address pins into a serial coded waveform suitable for RF or IR modulation. PT2262 has a maximum of 12 bits of tri-state address pins providing up to 531,441 (or 3 ) address codes; thereby, drastically reducing any code collision and unauthorised code scanning possibilities. "

Typical remote circuit thus looks as follows:

Taking hardwired address bits and data bits set by pressed buttons the PT2262/AD2262 modulates RF transmitter, supposedly designed to work in ISM band. Modulation frequency is set by resistor connected to pins 15 and 16 forming RC-oscillator circuit together with the chip.

Making switches to operate electronically would permit to use home automation software. to control the remote and, therefore, mains devices wired to the mains module.