I’m working on building a web enabled remote control for our window AC units. Thanks to AnalysisIR I have a basic sketch that lets me send arbitrary NEC IR codes via the core (github). The IR controls are fairly limited though, on/off is a toggle and setting the temp is done via increment/decrement codes.
Opening up the AC unit I’ve verified I can use an optoisolator to read the status of the power LED with the core. I was hoping for an easy to read pinout on the 2 digit 7 segment display but it is a 10 pin package. I’m assuming that the pinout is something like the image below but I won’t know for sure until I get a chance to use a scope on it.
So with all that, does anyone have any ideas on how I can read the state of this display via a core? I guess it will depend on what frequency the display is getting switched at. My only idea so far is to listen to ds1 and ds2 via interrupts and read the state of the segment pins in the interrupt method. My guess is that approach will depend on how fast the chip controlling this display is switching between digits.