Once I had worked out which board I was using - it was called nodemcu - (I had actually chosen "Espressif ESP8266 ESP-12E" from the Project builder in PlatformIO) I could set the pins in the ...

espressif / arduino-esp32 Public. Notifications You must be signed in to change ... I2C SDA and SCL Pull-Ups Can't Be Disabled #4887. Copy link. ... is called, the SCl and SDA GPIOs stay high no ...