Teapot BWLR3D is an Asset Tracker and Environmental Sensor with Solar Energy Harvesting. The device is capable of sensing temperature, humidity, air pressure, air quality, light intensity using the on-board BME688 plus VEM7700, and calculate device's AHRS using the LSM6DSOX as accelerometer and gyrometer with LIS3MDL as magnetometer. Equiped with low-power L86-M33 GNSS module, the device is capable to locate itself anywhere in the world. With STM32WLE MCU as it's core and AEM10941 for solar charging, the device is capable ultra-low power operation with the possibility of indefinite battery-life by utilizing the solar charging capability.

Teapot BWLR3D is part of Teapot open-hardware project.

This Project is the same as this, but uses RAK11720 and external antenna via IPEX

The images and documentation here does not reflect these changes.



Specification

• RAK11720: an Ambiq Apollo3 Blue SX1262 LoRa Bluetooth Module
• AEM10941: Solar energy harvesting chip
• 3.3V only power/pin.
• 12uA Deep-Sleep
• Switchable TX Power. 14 dBm(50mA) or 22 dBm(140mA) ( on 915MHz frequency )
• Supports LoRaWAN 1.0.3
• 1KM+ Range
• UART2 breakout for Arduino progamming
• SWD breakout for Mbed OS/STM32Cube programming
• IPEX antenna connector
• 3.7 Volts LiPo Battery

On-board sensors:

• L86-M33: GNSS module
• LSM6DSOX: Accelerometer and Gyrometer
• LIS3MDL: Magnetometer
• VEML7700: Ambient Light Intensity meter
• BME688: Environmental sensor

Schematics

Schematic revisions:

• Revision 1: Initial design
• Revision 2: Swap BATT_MEAS and IMU_INT pin, and add 0.1uF to voltage divider

Boards

Built using KiCAD, the board is design to be as small as possible with all components placed on both side of the PCB. The following design are based on the latest revision.

For more detail please visit the GitHub project here!