Edit: not sure why...but it works now. Hello, I'm having trouble using GPIO3 and GPIO1 (uart tx and rx pins) on an ESP8266 for basic discrete input & output when I'm already using other pins for SPI. On an ESP8266 (nodeMCU), I have the following: SPI OLED display (4 pins, SPI) Color sensor (5 pi…

[solved] Using uart pins tx & rx and SPI with ESP8266

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