Badge Edition. Expansion module

There are two types of the expansion module available.
The first one is a bare-bone pin-to-pin cable. The second one is populated with MPU-9250 IMU sensor and MSM261 MEMS microphone.

The module occupies a miniature slot on the T-Echo main board.

Just plug it in like that and you are all set.

Certain pads of the cable have direct match to pinout of most I2C sensors on the market. One can use it to connect a BMP280 air pressure sensor (if your T-Echo variant does not have it built-in)

When a sensor is connected properly - it gets detected at boot time.

ATTENTION: the basic IMU support is a part of Release 1.2 firmware update.

The data from air pressure and/or IMU sensors gets displayed on the Baro and G load UI pages respectively.

There is an option to connect an external RS-232C device to UART pins of the T-Echo MCU.

Function	Pin
TxD	P0.06
RxD	P0.08

Signal levels: 3.3 Volt
Transfer settings: 38400 bps, 8N1

Use the SoftRF Configuration Tool then to alter direction of data output.

Bill of materials

Number	Part	Qty	Picture	Source
1	LilyGO® T-Echo  Expansion module	1		AliExpress
2	Bosch BMP280 pressure sensor	1		AliExpress