J

I tried your suggestion of enabling it in the constructor and it had the same erratic/floating behavior. I then re-enabled the explicit pullup in the setup() func and it worked...

The Nano ESP32 is ESP32-S3 based I believe. From this doc: https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/api-reference/peripherals/gpio.html SPI0/1: GPIO26-32 are usually used for SPI flash and PSRAM and not recommended for other uses. So I...