Hello guys,

I have a ESP32-Cam module, which cannot use the analog pins and wifi simultaneously. In the project which I want to realize a photo must be shot when it is bright .

I use a photoresistor and wanted to ask you guys if the following circuit could work:



Both pins are set high.
If it is bright the resistance of the LDR is low and the transistor is switching which leads to the right pin becoming low.

I would be grateful for any advice or help

 

That would work, but the switching from off to on would be somewhat slow (the transistor would slowly change from off to on, depending upon how fast the light changes intensity).

Is that a concern?

 

thank you very much

 

Just connect the LDR between the right pin and ground, then enable the internal pull-up resistor. You don't need the transistor.

 

Are the inputs Schmidt trigger? It will work better if they are. On Pics, some are and some not.

Bob

 

Are the inputs Schmidt trigger? It will work better if they are. On Pics, some are and some not.

Bob

And on some you can set them to be schmidt or not.