AVR128DB28

AVR Printed Circuit Board for creating IOT nodes with the RFM95 LORA chip.

See:

• https://www.thethingsnetwork.org/forum/t/avr128db28-pcb-with-rfm95/50864
• https://www.thethingsnetwork.org/labs/story/a-cheap-stm32-arduino-node

for background and old software samples.

This repository now has tested LMIC (https://github.com/tomtor/STM32-RFM95-PCB/tree/master/AVR128DBLora) and RadioLib (https://github.com/tomtor/STM32-RFM95-PCB/tree/master/AVR128_RadioLib) Arduino code for the AVR128DB board with the RFM95W.

Schema: https://github.com/tomtor/STM32-RFM95-PCB/raw/master/AVR-LORA.pdf

Note that most components are optional:

• A LED to flash
• I2C 4K7 pull up resistors
• A lot of capacitors (mounting a single 1uF will do in most situations)
• 32.768kHz crystal
• 24MHz crystal
• MCP1700 regulator with 1uA idle current
• Schottky diode for charging NiMH batteries from a solar panel
• Voltage divider for measuring battery voltage

Aisler link for producing 1206 board: https://aisler.net/p/EAZHDDHF

Aisler link for producing 0805 board: https://aisler.net/p/ZRKAROVP

STM32-RFM95-PCB

STM32 Printed Circuit Board for creating IOT nodes with the RFM95 LORA chip

See:

• https://www.thethingsnetwork.org/labs/story/a-cheap-stm32-arduino-node
• https://gist.github.com/tomtor/c754355f1b98370e78b4025f236d990e (Arduino sketch)

You can order this board here:

https://aisler.net/p/CZGCIFFH

Credits:

https://github.com/myelin/myelin-kicad-libraries (STM32 module KiCad library)

https://github.com/mysensors-kicad/mysensors_symbols (RFM95 KiCad library)

https://github.com/novirium/ESPilot/blob/master/lib/ESPilot.pretty/RFM95.kicad_mod (RFM95 KiCad footprint)