ahmednuaman / rpi-nest-radiator-switch

A nodejs project to get a Raspberry PI to control a towel radiator using the Nest API

rpi-nest-radiator-switch

A nodejs project to get a Raspberry PI to control a towel radiator using the Nest API

Setting up the hardware parts

You'll need:

• A Raspberry PI, I'm using v3 (with OS installed, plus git, daemontools, and node)
• A 10A 240V relay (eg this one from eBay)
• GPIO connectors (I've used female-to-female)

This is my hardware set up:

I use PINs 12 (BCM 18), 1 (5V), and 14 (Ground) to connect to the relay (you're able to change this in the code). Here's a handy chart: https://pinout.xyz/

Getting your auth settings

This project uses the config.json to hold your access token. Thankfully Nest uses non-expiring tokens so to get your access token simply follow these steps:

1. Do everything as root (I know, I know)
2. Open /etc/rc.local and add svscan /service & before exit 0
3. Make a folder /service
4. cd into /service and clone the repo, this'll create a folder within called rpi-nest-radiator-switch
5. cd into the repo folder, run chmod +x run
6. Register a new Nest project for yourself: https://developers.nest.com/products
7. Create a whack 'Redirect URI'
8. Take note of the Product ID and Product Secret and hit the Authorization URL
9. Take note of the code in the URL once you've authed
10. Make the CURL request displayed here: https://developers.nest.com/documentation/cloud/sample-code-auth
11. Copy and paste the response into config.json (it ought to look like { "access_token": "xxx", "expires_in": 315360000 })
12. Don't forget to set your target_thermostat too, this is the ID (key) under devices > thermostats object: https://developers.nest.com/documentation/api-reference