green = TX, 3.3V TTL level (connect to RX on MCU side)
blue = RX, 3.3V TTL level (connect to TX on MCU side)
cable assignment:
- red = +5V
- black = GND
- green = TX, 3.3V TTL level (connect to RX on MCU side)
- blue = RX, 3.3V TTL level (connect to TX on MCU side)
white = RX, 3.3V TTL level (connect to TX on MCU side)
yellow = TX, 3.3V TTL level (connect to RX on MCU side)
cable assignment for MH-Z16:
* black = GND
* red = +5V
* white = RX, 3.3V TTL level (connect to TX on MCU side)
* yellow = TX, 3.3V TTL level (connect to RX on MCU side)