Stamp size MySensor node

My first attempt at a full smd version of a minimal node. This one is just for testing the combination of an all smd node with a CR1620 battery.

Boards were made at OSH Park.

Node board:

https://oshpark.com/shared_projects/EO8F3MPe

Battery board:

https://oshpark.com/shared_projects/dZVILUiz

Still missing the 1M Ohm pull up resistors and the ATSHA204A (on order).

This node now runs as a switch detector node in my Domoticz network. The battery can handle the short bursts of transmission, but can not keep the LED on for more then a few seconds before you can see it dimming.

Mounting this node was as follows:

Start with soldering the MCU, the resistors and capacitors, then add the ISP and FTDI header. Program the mcu with the boot loader. Then check with a blink sketch if FTDI also works. After that, solder the NRF24L01+ on the bottom.

On each side there are 8 pins which each time include a VCC and a GND pin.

If the dual row header is like in the family picture below (furthest away from you), then the left hand side pin row (starting from furthest away towards you) has following signals:

GND - D2 - D3 - D4 - D5 - D6 - D7 - VCC

The right hand side has following pins:

VCC - A5 - A4 - A3 - A2 - A1 - A0 - GND

This means there are also I2C pins available:

A5 is also SCL A4 is also SDA

Power consumption without ATSHA204A and using internal Pull Up on D2 is measured as follows:

In deep sleep: 1.61 uA Sleep with Watchdog Timer running: 5.33 uA

Sending of voltage and pin status uses around 19mA for a short while (could not yet measure that timing).

Battery capacity is around 130 mAh. With an average consumption of around 10uA, this node should reach 380 days. If that would be true, I would be happy. In any case a year seems possible so I will set this node in a corner and let it signal it's battery voltage every hour. It's a dumb minion anyway, so it should be happy with any task :-).

My little stamps with their narrow brother all boot loaded and ready for duties:

My little stamps with their narrow brother

Images

Design Files

Source Code

NameSize# Downloads
optiboot_atmega328_08M_038400_D8.hex1.35 kB225

Bill of Material

PartValueDevicePackageDescription
C1100nFC-EUC0805C0805CAPACITOR, European symbol
C2100nFC-EUC0805C0805CAPACITOR, European symbol
C3100nFC-EUC0805C0805CAPACITOR, European symbol
C41uF-10uFC-EUC0805C0805CAPACITOR, European symbol
FTDI6 pin headerPINHD-1X61X06PIN HEADER
H11X08HEADER1X08HEADER1X08ROUND
H21X08HEADER1X08HEADER1X08ROUND
ICSP6 pin headerPINHD-1X61X06PIN HEADER
LED0805LEDSML0805SML0805LED
NRFWIRELESS-NRF24L01SMDWIRELESS-NRF24L01SMDWIRELESS-NRF24L01-SMD2.4 GHz Wireless Module based on NRF24L01 chip
R110KR-EU_M0805M0805RESISTOR, European symbol
R2330R-EU_M0805M0805RESISTOR, European symbol
R31MR-EU_M0805M0805RESISTOR, European symbol
R41MR-EU_M0805M0805RESISTOR, European symbol
U1ATMEGA328P_TQFPATMEGA328P_TQFPTQFP32-08
U2ATSHA204AATSHA204ASOT23-R
BATKeystone 3013Through hole versionCR1632 battery holder by Keystone Technologies

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