Hoval Gateway (CAN Bus)

This repository contains a simple Gateway for Hoval ventilations and other applicances. Most of the logic and the idea is from this repository: https://github.com/zittix/Hoval-GW

Thanks a lot!

It is configured for a Hoval ventilation (HV) (mostly in German - i will change that soon). If you have another device you have to configure the datapoints in the gateway/settings.py and also change the device, datapoints can be read in docs/datapoints.csv. If you need help setting up your devices make a new issue, i will help you.

Features

• Read data and publish to mqtt server
• Create periodically task (needed e.g. for temperature sensors) for data requests
• Set data, subscribed by mqtt server

Important

This repository is simply a demo and not for production use. Use with caution!

If you found any issues or improvements feel free to add pull requests or an issue!

Setup required

Hardware

1. Raspberry PI
2. CAN Transceiver and adapter (or simply a complete board e.g. PiCAN2 or CanHat)

Pinout of RJ45 CAN

1: CAN-HIGH
2: CAN-LOW
7: GND

Instructions

1. Install Raspbian
2. Install and setup CAN

# Update Raspbian
sudo apt-get update 
sudo apt-get upgrade 
sudo reboot 

sudo vim /boot/config.txt

# Add these 3 lines to the end of the file
dtparam=spi=on 
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25 
dtoverlay=spi-bcm2835-overlay
#### or for 2ch-CanHat
#dtparam=spi=on
#dtoverlay=mcp2515-can1,oscillator=16000000,interrupt=25
#dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=23
#dtoverlay=spi-bcm2835-overlay

3. Install and setup can-utils and python3

sudo apt-get install -y can-utils python3

4. Clone repository
5. Install dependencies and add your own .env

cd hoval-gateway
pip3 install -r requirements.txt
vim .env

# Add these Environmentals and replace them with your values
MQTT_BROKER=IP_OF_YOUR_BROKER
MQTT_BROKER_USERNAME=USERNAME
MQTT_BROKER_PASSWORD=PASSWORD

# not needed, default is hoval-gw
MQTT_TOPIC=

6. Setup CAN Interface to be up at boot time

sudo vim /etc/rc.local

# Add this line bevor exit(0)
ip link set can0 up type can bitrate 50000

7. Reboot
8. Start Script python3 . -s settings.yml

After Install

MQTT

• To use this script you need to setup a mqtt server or use a public one

Home Assistant

• the dashboard seen above is released under docs/configuration.yml and docs/automations.yml

Topics

MQTT-Topics are standardized in the structure:

• for requesting data: MQTT_TOPIC/DATAPOINT_NAME/status
• for setting new values: MQTT_TOPIC/DATAPOINT_NAME/set

e.g. hoval-gw/temperature_outside_air/status