ESP-01S No input on GPIO3(RXD) PIN
Posted: Sat Oct 07, 2017 6:19 pmI'm working on a small project and want to use the RXD pin(3) as an input. I have done the TX_ONLY startup for Serial.begin and added the pinmode as INPUT_PULLUP, however it appears to be dead. The kicker is that if I use gpio2 or even gpio0 as an input, it works. I'm baffled, I've used this INPUT on a blue ESP-01(512k) without an issue. I am stumped, any help would be awesome! The RXD pin works, as I use it to flash the device when it's in bootloader mode...