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APRS Nanomodem

motivemachine·APRS_Nanomodem·kicad/AX25_TNC_modemmodule.kicad_pcb

APRS Nanomodem PCB layout, top view — open source AVR/Arduino board by motivemachine

About the APRS Nanomodem PCB

APRS Nanomodem is an open source AVR/Arduino PCB design by motivemachine, published on GitHub under the MIT license. It is a 2-layer board measuring 31.8 × 29.5 mm, with 33 components from 24 distinct parts.

Its main chip is the ATmega328P-AU, from the AVR/Arduino family. By type, the board carries 14 resistors, 9 capacitors, 2 diodes, 1 IC, 1 transistor and 1 crystal.

It belongs with the rf & radio designs in this gallery.

From the project

My PCB design for an APRS TNC, based on Mark Qvist's excellent MicroModem design. Can be used as a standalone TNC or controlled by several serial protocols. This repo is a mirror for:

My PCB design for an APRS TNC, based on Mark Qvist's excellent MicroModem design. Can be used as a standalone TNC or controlled by several serial protocols. Castellated and through-hole design allows space-saving mounting on larger boards SMD style, or easy use with perfboard, breadboard, or jumper wires.

APRS Nanomodem, from the project README
From the project README

Main components on the APRS Nanomodem

ATmega328P-AU

APRS Nanomodem bill of materials (BOM)

33 components, 24 distinct parts.

QtyPartRefs
1
ATmega328P-AU
U1
1
BSS138
Q1
1
16Mhz
Y1
1
gen2
J14
2
Conn_01x01_Female
5v, g2
1
R_POT_TRIM_US
RV1
1
gen1
g1
1
tx
D2
1
rx
D3
2
.1uf
C1, C2
1
1uf
C3
2
18pf
C4, C5
2
100nf
C6, C8
1
4.7uf
C7
1
10uf
C9
3
100k
R1, R2, R3
2
4k7
R4, R9
1
8k2
R5
1
3k9
R6
1
2k2
R7
Show 4 more
QtyPartRefs
2
1k
R8, R12
2
10k
R10, R13
1
270
R11
1
200k
R14

APRS Nanomodem design files

The KiCad project lives in the motivemachine/APRS_Nanomodem repository on GitHub; these links point at the commit this page was built from.

APRS Nanomodem: common questions

What microcontroller does the APRS Nanomodem use?

The APRS Nanomodem is built around the ATmega328P-AU, from the AVR/Arduino family.

How big is the APRS Nanomodem PCB?

The APRS Nanomodem measures 31.8 × 29.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the APRS Nanomodem?

33 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the APRS Nanomodem design files?

From the motivemachine/APRS_Nanomodem repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the APRS Nanomodem design in my own project?

Yes, under the terms of its MIT license, which motivemachine chose for the repository.

Can I test firmware for the APRS Nanomodem 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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