ethereum-smartplug

How to integrate Arduino, NODE-RED, RPi3 and Ethereum

Ethereum Smart Plug is the prototype of a smart charging point based on a smart-contract, RPi3 and NODE-RED. The plug receives a transfer from the user and it allows the charging of a device for as many Wh as they wer purchased.

INTRODUCTION

This project relies on:

Johnny-five http://johnny-five.io/
Node.js https://nodejs.org/en/
web3.js https://github.com/ethereum/web3.js/
Geth https://github.com/ethereum/go-ethereum/wiki/geth
Ethereum token contracts https://github.com/ConsenSys/Tokens
MQTT http://mqtt.org/
NODE-RED https://nodered.org/

Equipment:

Smart Plug: Electrical Outlet Box, Electrical Outlet, Electrical Outlet Box Cover Plate, 3/8″ NM/SE Connector, Power Strip, SRD-05VDC-SL-C 5V Relay, Signal, Vcc and Ground Wires
Arduino UNO
emonBase (RPi3) + emonTx https://guide.openenergymonitor.org/

STEPS

First of all, we need to set up the relay and the Arduino to control the plug. Instructions: (http://www.circuitbasics.com/build-an-arduino-controlled-power-outlet/)
Set up the metering device Instructions: emonBase + emonTx https://guide.openenergymonitor.org/setup/
Geth node needs to be installed on the emonBase (or emonPi). Instructions: https://github.com/GregSimo/geth-emonpi
Upgrade (or install) NODE-RED and Node.js latest versions. Instructions: http://nodered.org/docs/hardware/raspberrypi.html
Install J5 module on NODE-RED Instructions: https://timchooblog.wordpress.com/2016/06/14/configuring-the-johnny-five-robotics-library-to-work-in-node- red/

Install web3.js library Add to the main settings.js file under the functionGlobalContext property:

functionGlobalContext: {
//  osModule:require('os'),
    web3:require('web3')
}

then install the library

pi@emonpi(ro):~$ rpi-rw  
pi@emonpi(rw):~$ cd .node-red
pi@emonpi(rw):.node-red$ npm i web3

Restart NODE-RED

Finally, let's open the port so that NODE-RED can connect to the local node (http://localhost:8545)

pi@emonpi(rw):~$sudo iptables -A INPUT -p tcp -m tcp --dport 1880 -j ACCEPT
pi@emonpi(rw):~$apt-get install iptables-persistent

Choose yes to save rules, if needed edit the persistent rules:

pi@emonpi(rw):~$ sudo nano /etc/iptables/rules.v4

Once finished all the steps, the configuration is ready. Import the flow available at http://flows.nodered.org/flow/6fb801127cfbfb81b3e629b5d336900c into NODE-RED to get started.

kuip/ethereum-smartplug

ethereum-smartplug