⚙️Hardware

Components... Assemble!

🛆 Overview

The 'Mini RAK-Tracker' is based on the RAK3172 microcontroller from RAKwireless. This board computer encapsulates an STM32WLE5CC and all the components needed to run it.

The board is equipped with LoRa communication integrated into the RAK3172, a geolocation chip and several environmental sensors.

Features

• MCU : STM32WLE5CC

• Operation frequency : up to 48 MHz

• Flash Memory : 256 Kbyte

• Ultra Low Power Device

• GPS : on board chip antenna + uFL connector

• LoRa : on board chip + uFL connector

• Three environmental sensors

• Additionnal Flash Memory for data logging

• Embedded battery protection

• Embedded battery charging with status LED

• Two user LEDs

• A switch ON/OFF

• Bulky board for easy debugging

• Tiny size : 24x18x6mm

Main components

Function	Component	Note
µControler	RAK3172	On-board computer with LoRa features
USB To UART	CH340E	For programming with Arduino
GNSS chip	MAX-M10S	For Geolocalisation
GNSS antenna	W3011	Small SMD Antenna
Sensor #1	BMP280	Pressure
Sensor #2	LSM303AGR	Accelerometer + Magnetometer
Sensor #3	VEML6040	RGBW Light
Flash Memory	MX25R8035F	8Mbit for data logging
Voltage Regulator	TPS7A02	Linear 3.3V Regulator
LiPo Charger	MCP73831	Charging current set to 100mA
Battery Protection	XB6042I2SV	-
LEDs	VLMB1500	Two LEDs on-board
Power Switch	PCM12SMTR	Power ON or Power OFF

---

🛆 Conception

The board is connected to three mouse bits. This allows information to be displayed for a better understanding of the board. It's always handy to be able to pull out this piece of board instead of a documentation to find the component. Separating the board from the panel is easy.

Front Side

On the front of the board are the components that bring the board to life: the sensors. To the right are the three environmental sensors and the power switch. To the right are the flash, indicator LEDs and a reset button with a jumper for bootoloading. In the centre of the board is the essential element, the GNSS chip.

Back Side

The back of the board contains the microcontroller and a user LED. At the bottom is the chip that communicates with the on-board computer and the power assembly: the voltage regulator, the battery charger and its slot.