AVR RFM95 805 board

tomtor·STM32-RFM95-PCB

AVR RFM95 805 board layout, top view — open source board by tomtor

About the AVR RFM95 805 board

AVR RFM95 805 board is an open source PCB design by tomtor, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 51.7 × 29.2 mm, with 34 components from 20 distinct parts.

Other key parts include the MCP1700-3302E_SOT23, RFM95HW and AVR128DB28. By type, the board carries 12 capacitors, 5 connectors, 5 jumpers, 5 resistors, 3 ICs and 2 crystals.

It belongs with the rf & radio, iot & wireless and power & battery designs in this gallery.

From the project

STM32 and AVR128 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.

AVR RFM95 805 board, from the project README — From the project README

Main components on the AVR RFM95 805 board

MCP1700-3302E_SOT23 RFM95HW AVR128DB28

AVR RFM95 805 board bill of materials (BOM)

34 components, 20 distinct parts.

Qty	Part	Footprint	Refs
1	MCP1700-3302E_SOT23	SOT-23	U1
1	RFM95HW	RFM95	U2
1	AVR128DB28	SOIC-28W_7.5x17.9mm_P1.27mm	U3
1	24MHz	Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm	Y1
1	32768Hz	Crystal_Round_D3.0mm_Vertical	Y2
1	Batt	PinHeader_1x02_P2.54mm_Vertical	J1
1	Solar	PinHeader_1x02_P2.54mm_Vertical	J2
1	SMA	SMA_Amphenol_132134_Vertical	J3
2	CONN_01X14	PinHeader_1x14_P2.54mm_Vertical	J4, J5
4	SolderJumper_2_Open	SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm	JP1, JP2, JP3, JP4
1	Close when no MCP1700	SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm	JP5
1	BAT54S	SOT-23	D1
1	LED	LED_0805_2012Metric	D2
5	1uF	C_0805_2012Metric	C1, C2, C8, C10, C12
2	20pF	C_0805_2012Metric	C3, C4
2	10pF	C_0805_2012Metric	C5, C6
3	100nF	C_0805_2012Metric	C7, C9, C11
1	100R	R_0805_2012Metric	R1
2	4K7	R_0805_2012Metric	R2, R3
2	1M	R_0805_2012Metric	R4, R5

AVR RFM95 805 board design files

The KiCad project lives in the tomtor/STM32-RFM95-PCB repository on GitHub; these links point at the commit this page was built from.

LayoutAVR-LORA-805.kicad_pcb
SchematicAVR-LORA-805.kicad_sch

AVR RFM95 805 board: common questions

How big is the AVR RFM95 805 board?

The AVR RFM95 805 board measures 51.7 × 29.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the AVR RFM95 805 board?

34 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the AVR RFM95 805 board design files?

From the tomtor/STM32-RFM95-PCB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the AVR RFM95 805 board design in my own project?

Yes, under the terms of its GPL-3.0 license, which tomtor chose for the repository.

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