Dollhouse_Wireless_Node

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Dollhouse_Wireless_Node

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Wireless nRF24 MySensors IoT node

// repository documentation

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# Dollhouse Wireless nRF24 MySensors IoT node

This sensor node was designed to be used in the MySensors dollhouse display, created for the [Eindhoven Maker Faire 2017](http://www.eindhovenmakerfaire.nl)

<img src="https://raw.githubusercontent.com/Yveaux/Dollhouse_Wireless_Node/master/images/multiple.jpg">
Left-to-right: gesture sensor, door sensor, wind sensor, soil moisture sensor

Original requirements
========
* Very small, so it can be mounted visible in the house without distracting too much 
* 5V supply, or battery powered (CR2032)
* runs at 3V3
* nRF24L01+, SMD version
* 8MHz, internal oscillator
* Optional buffer cap (47..100uF) for battery node
* ATMega328; cheap, stay close to well known Arduino UNO/Pro mini
* ISP connector; small, ProtoProg
* Serial connector; small, pogo pins, GND, RX, TX, DTR (reset)
* At least 1 sensor per node
* On/off switch (for battery sensors)
* Application LED (Pin 4)
* Power LED (d.n.p. for battery sensor)
* IO to support sensors

The resulting node is very small (28.5 x 25.5mm, excluding antenna) and costs roughly E4,30/piece (excluding sensor)

Layout
========
<img src="https://raw.githubusercontent.com/Yveaux/Dollhouse_Wireless_Node/master/images/top.png" height="250"> <img src="https://raw.githubusercontent.com/Yveaux/Dollhouse_Wireless_Node/master/images/bottom.png" height="250">

Addon connector pinout
========
| Pin  | Arduino Pin | Alternate Function |
| ---- | --- | --- |
| 1    | GND | | |
| 2    | VCC |
| 3    | 3 | INT1 |
| 4    | 2 | INT0 |
| 5    | A5 | I2C SCL |
| 6    | A4 | I2C SDA |
| 7    | 5 | |
| 8    | 6 | |
| 9    | 7 | |
| 10   | 8 | |

Pin 1 is next to the FTDI pogo pin connector.

Addon board
========
I created a small addon board to simplify connecting a numer of standard sensors. It can be mounted on the IO connector using male headers.
Supported sensors/actuators:
* 2 servo's
* AM312 Mini PIR
* BME280 Temperature, relative humidty & pressure sensor
* APDS9930 Digital Ambient Light and Proximity Sensor
* APDS9960 RGB & gesture sensor
Please make sure to verify the pinout and supply level of a module before connecting it to the addon board!

Addon proto board
========
Small 10 x 4 proto board to connect other sensors (e.g. the soil humidity & wind-speed reed sensor)

Construction
========
Start with the ATMega, followed by the small SMD's on the top and nRF24. Flip the board and mount either the CR2032 holder, or the AMS1117-3V3.

The switch is optional. Either mount the switch or short solder jumper SJ1.

Mount the power LED (and its resistor R2) if you prefer a visible indication of a node being switched on. Do not mount it on a CR2032 powered sleeping node as it will drain the battery too quickly.

Pull-up resistors R4-R11 can be used for digital inputs to further reduce the power drain. Mount approx. 1Meg ohm and disable internal pullups.

When powered from a 5V supply (and AMS1117 mounted) use the RAW and GND pins to power the board.

Programming
========
To keep the sensor small the ISP and FTDI connectors are scaled down to use pogo pins for programming.
ISP programming requires a [ProtoProg](http://protofusion.org/wordpress/2013/05/open-hardware-pogo-pin-programmer/) adapter.

To flash the bootloader refer to my [Ikea Molgan Hack](https://github.com/Yveaux/Ikea_Molgan_Hack)

The serial connection used by the Arduino IDE is available at a 5 pin FTDI-to-pogo adapter, also included in this repository. Make sure to align the white pin on the adapter to the white pin on the board. I use the node's power when programming at 3V3 serial levels.

Known issues
========
* The buffer capacitor C4 is located after the switch. Powering off a sleeping sensor will take some to actually shut down the sensor as the buffer capacitor will still supply the ATMega for some time.

Dollhouse_Wireless_Node

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