This firmware uses LightTracker 1.1 433MHz open source code from https://github.com/lightaprs/LightTracker-1.1-433 and ports it for use on a Ebyte E77 mcu - lora 433 mhz module. The development board can be purchased for about $10 from China.
It is able to report location, altitude, temperature and pressure to the internet via LoRa APRS gateways or direct to another LoRa radio module with a solar panel/super capacitors or just 3xAAA batteries. Because it is open source you can add your own custom sensors via I2C pins.
Important : This may require an amateur radio license to operate if 433 MHz is not ISM band in your country. So check regulations before using it.
- Software : Open Source
- Weight : 6.5 grams without E77 dev board with antenna and no gps (with pins and sma connector manually removed)
- Weight : 1.3 grams with only the gps module and the E77 module (aluminum shield removed)
- Dimensions : x mm x x mm
- IDE : Platformio
- Platform : STM32 Cortex-M4 with a SX1262 built in to the chip
- CPU : STM32WLE5CCU6
- Flash : 256 kB
- Ram : 64 kB
- Operating Frequency : 48 Mhz but could be reduced for more energy savings
- Operating Voltage : 3.3 Volt
- Input Voltage :
- Sensor : HP303B (pressure and temperature) sensor not on board, but can be added
- Power Consumption : TBD
- LoRa STM32 dev board : EBYTE E77 dev board (SX1262)
- LoRa Radio Module : EBYTE E77 module (SX1262)
- LoRa Operating Frequency : 410~510MHz (configurable by code)
- LoRa Max Power : 22dBm (configurable by code)
- LoRa Power Consumption (TX) : ~110 mA (22dBm)
- GPS : Ublox CAM-M8Q (GPS-GLONASS) or MAX-M8Q
- Extended Pins : many
