https://github.com/ptz0n/ctc-controller

https://github.com/ptz0n/ctc-controller

arduino home-automation smarthome

Last synced: 11 days ago
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• Host: GitHub
• URL: https://github.com/ptz0n/ctc-controller
• Owner: ptz0n
• Created: 2021-11-25T07:45:29.000Z (about 3 years ago)
• Default Branch: master
• Last Pushed: 2021-11-25T10:08:24.000Z (about 3 years ago)
• Last Synced: 2024-10-31T02:23:03.928Z (about 2 months ago)
• Topics: arduino, home-automation, smarthome
• Language: Python
• Homepage:
• Size: 344 KB
• Stars: 4
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# CTC Controller

Retrofitting of an old CTC Ecoheat geothermal heat pump to act on electricity price fluctuations.

## Interfaces

### Output: Heat pump

Our heat pump does support an external control switch to be connected for activating a feature they call "Night drop". When activated, the target indoor temperature is dropped according to the setting. If Night drop is set to -5° C and activated, the target will drop from 22 to 17° C until deactivated.

![CTC Ecoheat terminal block](/ctc-io.png)

### Input: Electricity price

We're using [Tibber](https://tibber.com/se/invite/fb7a2cc5) and they have a great API to get the current prices.

```json

{

  "total": 0.2328,

  "energy": 0.1658,

  "tax": 0.067,

  "startsAt": "2021-11-23T00:00:00.000+01:00"

}

```

### Controller: USB controlled relay

I could have used a RaspberryPi (or similar) but wanted to try out the [Adafruit MCP2221A Breakout](https://www.adafruit.com/product/4471), which I hooked up to my home server via USB. Using a compatible one channel relay module and some Python logic to analyze the current prices to know when we should activate the Night drop.

## Installation

First, make sure to setup the required hardware and environment vars:

- TIBBER_TOKEN

- INFLUXDB_HOST

- INFLUXDB_USERNAME

- INFLUXDB_PASSWORD

- INFLUXDB_DATABASE

```bash

pip3 install -r requirements.txt

python3 main.py

```