USB to Serial
|GPIO04||I2C SDA 1|
|GPIO05||I2C SCL 1|
USB power and FTDI needs to be connected simultaneously to flash device. Press FLASH and RESET and release RESET to initiate flash. You have to flash tasmota-sensors.bin to use the SHT sensor.
Three jumper cables (female-female) for TX, RX and GND. The connectors DTR, CTS and VCC are not used. A special feature: Because the labelling was done in the same order as the FTDI, TX is connected to TX and RX to RX; not crosswise as usual with the UART interface!
Please be aware that the temperature and humidity sensor is located near the heated gas sensor. It is a nice board to play around but do not expect any usable temperature or humidity readings, since these a highly influenced by the heated gas sensor.