2 layers51.7 × 29.2 mm
AVR LORA-805
tomtor/STM32-RFM95-PCB
STM32 and AVR128 Printed Circuit Board for creating IOT nodes with the RFM95 LORA chip
39 parts20GPL-3.0
2 layers51.7 × 29.2 mm
AVR LORA
tomtor/STM32-RFM95-PCB20STM32 and AVR128 Printed Circuit Board for creating IOT nodes with the RFM95 LORA chip
- Size
- 51.7 × 29.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 39
- Nets
- 37
- Pads
- 143
- Tracks, vias
- 644, 116
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Mar 2017
- Updated
- 30 Mar 2025
Overview
AVR LORA is an open-source printed circuit board by tomtor, from the tomtor/STM32-RFM95-PCB repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 51.7 × 29.2 mm with 39 parts on 37 nets, routed with 644 tracks and 116 vias.
It is built around the AVR128DB28-I/SS and BAT54S. Its parts include 12 capacitors, 5 resistors, 5 connectors, 3 ICs and 2 diodes. It belongs with the radio and wireless boards and the STM32 boards of this library.
Main components
2
AVR128DB28-I/SS
SSOP-28-208mil-40℃~+85℃ 1.8V~5.5V 10bit 128KB 12bit 16KB 23 24MHz 8 Bit AVR Built-in FLASH SSOP-28-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
BAT54S
SOT-231 Pair Series Connection 1V@100mA 200mA 2uA@25V 30V 600mA SOT-23 Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdAVR128DB28
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:
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)
Parts
39| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 1uF | Capacitor_SMD:C_1206_3216Metric | C1, C2, C8, C10, C12 |
| 4 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1, JP2, JP3, JP4 |
| 3 | 100nF | Capacitor_SMD:C_1206_3216Metric | C7, C9, C11 |
| 2 | 10pF | Capacitor_SMD:C_1206_3216Metric | C5, C6 |
| 2 | 1M | Resistor_SMD:R_1206_3216Metric | R4, R5 |
| 2 | 20pF | Capacitor_SMD:C_1206_3216Metric | C3, C4 |
| 2 | 4K7 | Resistor_SMD:R_1206_3216Metric | R2, R3 |
| 2 | CONN_01X14 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J4, J5 |
| 1 | 100R | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | 24MHz | Crystal:Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm | Y1 |
| 1 | 32768Hz | Crystal:Crystal_Round_D3.0mm_Vertical | Y2 |
| 1 | AVR128DB28 | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | U3 |
| 1 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | Batt | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Close when no MCP1700 | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP5 |
| 1 | LED | LED_SMD:LED_1206_3216Metric | D2 |
| 1 | MCP1700-3302E_SOT23 | Package_TO_SOT_SMD:SOT-23 | U1 |
| 1 | RFM95HW | RFM:RFM95 | U2 |
| 1 | SMA | Connector_Coaxial:SMA_Amphenol_132134_Vertical | J3 |
| 1 | Solar | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
The 34 most common of 39 parts.
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Questions
How big is the AVR LORA PCB?
It measures 51.7 × 29.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AVR LORA use?
39 parts, built around the AVR128DB28-I/SS and BAT54S. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the AVR LORA KiCad files?
From the tomtor/STM32-RFM95-PCB repository on GitHub, at the commit this page was made from: the board is AVR-LORA.kicad_pcb and its schematic AVR-LORA-805.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the AVR LORA design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).