MySensor board

After reading about the MySensors project, I decided to design a small circuit board to hold the Arduino and radio module.

Status:

Nov 25th: I've assembled two working boards. Imgur photos
Nov 24th: I received the boards, Yay!!
Nov 7th, 2014: I'm waiting on the PCB's from Dirtypcbs.com, slow but cheap.
Oct 2014: Designed the PCB, Schematic
Oct 2014: I have some component libraries available here for the Arduino mini pro and the NRF24L01+ module.

Components and layout

I'm using prebuilt modules for the Arduino mini pro and the NRF24L01+ module. SOT-23 3.3V voltage regulator. 0805 resistors and capacitors (Soldered on a thru-hole capacitor until the 0805 tantalums arrive)

Connections

1 x I2C
2 x 1-wire
2 breakout connectors for most of the remaining IO pins

Qty	Device	Package	Parts	eBay search
1	ARDUINO_MINI_PRO_5V	ARDUINO_MINI_PRO_5V	IC1	New Pro Mini atmega328 5V 16M Replace ATmega128 Arduino Compatible Nano
1	NRF24L01	NRF24L01	IC2	NRF24L01+ Module
1	MIC5219 3.3V	SOT23-5	U3	MIC5219-3.3
1		MOLEX-1×2	JP1	0.100' crimp connector 2 pos
2		MOLEX-1×3	JP2 ,JP3	0.100' crimp connector 3 pos
3		MOLEX-1×4	JP4, JP5, JP6	0.100' crimp connector 4 pos
4	4k7	0805	R1, R2, R4, R5	0805 4.7k
1	10k	0805	R6	0805 10k
omit		0805	R3
1	470pf	0805	C1	0805 470pf
1	2.2uF	0805	C2	2.2uf 0805 tantalum

Board measures 1.2“ x 1.5”, mounting holes are at 0.925“ x 1.3”

Future Design notes

Correct the silkscreen for the I2C connector
Counterset the breakaway tabs slightly
Verify pricing on components before ordering board - 0805 Tantalum caps are pricey
Molex connectors slightly too close to arduino board

Arduino code

Also, visit the MySensors project for the MySensors library, gateway, and other code.
AM2320 - Sensor node for AM2320/AM2321 I2C temperature and humidity module Also reports transmission failure as VAR_2
Counter - Testing node, increments a counter once a second as VAR_1, and reports transmission failures as VAR_2
EEPROM reader - for debugging purposes, to find the node ID, parent, route, etc…