LoraWAN Header Backwards
About the LoraWAN Header Backwards PCB
LoraWAN Header Backwards is an open source AVR/Arduino PCB design by lostangles, published on GitHub. It is a 2-layer board measuring 111.9 × 34.6 mm, with 29 components from 20 distinct parts.
Its main chip is the ATmega32U4-AU, from the AVR/Arduino family. Other key parts include the FGPMMOPA6H, RN2903-I/RM095, SPX3819 and MCP73831. By type, the board carries 9 resistors, 6 capacitors, 5 ICs, 4 diodes, 2 connectors and 1 antenna.
It belongs with the rf & radio and dev boards & breakouts designs in this gallery.
From the project
Microcontroller + GPS Receiver + LoRaWAN radio
The LoraWAN-Stick incorporates the LiPo charging circuitry common to the Adafruit Feather line of dev boards, as well as follows the same pinout for attachment of Adafruit Featherwings. Because both the RN2903 and GPS module use serial communications, serial communications with other nodes may be difficult; the GPS module uses the hardware UART, and communication to the RN2903 uses software serial. From my experience, having multiple software serial interfaces tends to work in unexpected ways, and should probably be avoided without thorough testing.
Main components on the LoraWAN Header Backwards
LoraWAN Header Backwards bill of materials (BOM)
29 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | FGPMMOPA6H | FGPMMOPA6H | U1 |
| 1 | ATmega32U4-AU | TQFP-44_10x10mm_Pitch0.8mm | U2 |
| 1 | RN2903-I/RM095 | XCVR_RN2903-I%2fRM095 | U3 |
| 1 | SPX3819 | SPX3819 | U4 |
| 1 | MCP73831 | MCP73831 | U5 |
| 1 | JST_2PIN-SMT | adafruit-JST-PH-2-SMT | CN1 |
| 1 | USB_OTG | USB_Mini-B | P1 |
| 1 | CON-SMA | CON-SMA-EDGE | ANT1 |
| 1 | CONN_01X16 | Pin_Header_Straight_1x16 | JP1 |
| 1 | SPST | SW_PUSH_SMD | SW1 |
| 1 | DIODESCH | D_0805 | D1 |
| 1 | LED-BAT | D_0805 | D2 |
| 1 | LED-RED | D_0805 | D3 |
| 1 | LED-POW | D_0805 | D4 |
| 4 | 10uF | C_0603_HandSoldering | C1, C2, C5, C6 |
| 2 | 1uF | C_0603_HandSoldering | C3, C4 |
| 2 | 22 | R_0603_HandSoldering | R1, R2 |
| 3 | 100k | R_0603_HandSoldering | R3, R6, R7 |
| 3 | 1k | R_0603_HandSoldering | R4, R8, R9 |
| 1 | 10k | R_0603_HandSoldering | R5 |
LoraWAN Header Backwards design files
The KiCad project lives in the lostangles/LoraWAN-Stick repository on GitHub; these links point at the commit this page was built from.
LoraWAN Header Backwards: common questions
What microcontroller does the LoraWAN Header Backwards use?
The LoraWAN Header Backwards is built around the ATmega32U4-AU, from the AVR/Arduino family.
How big is the LoraWAN Header Backwards PCB?
The LoraWAN Header Backwards measures 111.9 × 34.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the LoraWAN Header Backwards?
29 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the LoraWAN Header Backwards design files?
From the lostangles/LoraWAN-Stick repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the LoraWAN Header Backwards design in my own project?
The repository has no license, so all rights stay with lostangles. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the LoraWAN Header Backwards without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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