HardLabs

Postman

boanjo·myhome·postman_rfm95/KiCad/postman/postman.kicad_pcb

Postman PCB layout, top view — open source AVR/Arduino board by boanjo
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About the Postman PCB

Postman is an open source AVR/Arduino PCB design by boanjo, published on GitHub. It is a 2-layer board measuring 92 × 110 mm, with 31 components from 25 distinct parts.

Its main chip is the ATmega328P-A, from the AVR/Arduino family. Other key parts include the MCP1700x-330xxTT and RFM95W-868S2. By type, the board carries 9 capacitors, 4 resistors, 3 ICs, 3 connectors, 3 battery holders and 3 test points.

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

From the project

A collection of mysensors nodes, gateways and HW from my home

The weather station is connecting 3 different sensors with water protected connections and casing. I've used a Adafruit PermaProto 1/2 sized board which works well here since it's mainly soldering of connectors we need to do and a few resistors.

The focus for this model is to protect the GX12 connections and the PCB but this with easy access. The box has plenty of room for the homemade 433MHz antenna: http://www.byvac.com/downloads/RLnn/How-to-make-a-Air-Cooled-433MHz-antenna.pdf.

Postman, from the project README
From the project README

Main components on the Postman

ATmega328P-AMCP1700x-330xxTTRFM95W-868S2

Postman bill of materials (BOM)

31 components, 25 distinct parts.

QtyPartRefs
1
ATmega328P-A
U1
1
MCP1700x-330xxTT
U2
1
RFM95W-868S2
U5
1
ISS55EP06LMXTSA1
Q1
1
Crystal
Y1
1
Jack-DC
J1
1
ISP MEGA
J6
1
FTDI MEGA
J7
1
Antenna
AE1
3
Battery_Holder_1xAA
BT1, BT2, BT3
1
~
JP1
1
RESET ATMEGA
SW3
1
3.7V
TP1
1
3.3V
TP2
1
GND
TP3
1
BLUE
D4
1
1uF
C1
1
4.7uF
C2
1
470uF
C8
4
0.1uF
C10, C11, C12, C15
Show 5 more
QtyPartRefs
2
22pF
C13, C14
1
1k
R10
1
10k
R12
1
100k
R14
1
560k
R16

Postman design files

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

Postman: common questions

What microcontroller does the Postman use?

The Postman is built around the ATmega328P-A, from the AVR/Arduino family.

How big is the Postman PCB?

The Postman measures 92 × 110 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Postman?

31 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Postman design files?

From the boanjo/myhome repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Postman design in my own project?

The repository has no license, so all rights stay with boanjo. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Postman 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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