MCP23017 Notworking if pico externally powered
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Edit: My MCP23017 for some reason worked when connected to USB, I changed it to a New one, and it worked fine, Sorry for the inconvenience.
Hello,
I have a really strange situation the MCP23017 library works fine when connected to a USB port but when the Pico is connected to external power it just stops, at the beginning I thought it was an I2C /frequency issue, but I have other connected devices working fine with same multiplexer tca9548a with no errors on external power.
My system is PICO PI connected to a TCA9548A I have 3 LCDs SSD1306 and 3 potentiometers from Pimorony the 7's channel in TCA is connected to MCP23017.
I have stripped the system till only the MCP23017 is connected, my challenge is? , I cannot debug or get any response, until I connect the USB which then the MCP works fine.
I'm using from the MCP23017 one port as an input (no load), I've checked the power usage, and I have no problem.
did anybody get a similar issue? any suggestion?
Kind regards