I’m trying to use my Arduino to interact with a cheapo HDMI switch. It has 3 LED’s indicating which of the 3 HDMI inputs is active. I would like to ‘read’ the state of each of these LED’s on the digital input pins.
With my trial and error attempts the pin reads high whenever it is connected, regardless of weather the LED is on or not.
Can anyone point me in the right direction?
Attached photo to show the HDMI switch circuit and the grey and purple wires I’m using to attempt to read from.