Let's Control It

Hi all

I have my esp configured to use I2C with a MCP23017. My question is how could I use a MCPGPIO as "high" sensor?

Currently I connect a switch to GND and when closed to the GPIO of the MCP. That works and I can send the data to domoticz.
But I would like to use the switch on +3,3V instead of GND. Means if I put 3,3V to the GPIO, it should trigger the switch to domoticz.

I think I have to configure the MCP23017 somehow, but I cannot find the solution.

Hope you understand the probem

Roman

The MCP23017 has a internal pull-up to 3,3V of about 100 KOhm
If you want to have it permanently low, you need to add a pull-down resistor between GPIO and Ground.
Try with 4.7 or 10 KOhm

Thank you. Works