arduino-flasher-33
esp32 (lolin32) based "USB-to-UART converter" for 3.3V powered arduino boards
For flashing a small arduino board (e.g. arduino-pro-mini) which:
- is powered by 3.3V
- doesn't have its own USB plug
you generally need a simple and cheap USB-to-UART converter supporting 3.3V TTL logic. However if you don't have one, but have an esp32 based board, it's possible to turn it into a such converter.
Serial1 pins used:
- RX - GPIO27
- TX - GPIO26
Note: reset pin isn't connected, use the hardware Reset button on the target board instead