Wi-Fi relays for controlling ventilation — WeMos D1, MQTT, and Home Assistant

Wi-Fi relays for controlling ventilation — WeMos D1, MQTT, and Home Assistant

We recently got balanced ventilation installed, and I have interfaced it with Home Assistant. However — the ventilation unit have three “special modes” that can not be enabled through the Modbus interface; fireplace, kitchen, and override. These can only be set on the touch panel, mobile app, or through inputs terminals on the controller.

So I repurposed an old project and made a three-relay Wi-Fi controlled module, using MQTT to send commands and receive statuses.

Then used Home Assistant to automate it 🙂

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Making a manual security alarm in Home Assistant

Making a manual security alarm in Home Assistant

Using a few cheap sensors, a wireless keypad, Zigbee2MQTT and Home Assistant; I was able to get a basic security alarm up and running during a free afternoon 🙂

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Controlling the Raspberry Pi HDMI port — with MQTT and Home Assistant

Controlling the Raspberry Pi HDMI port — with MQTT and Home Assistant

We have a Raspberry Pi driven digital calendar in the kitchen. I’m currently using crontab to turn the HDMI port off at night, and when we’re at work.

But a much more flexible solution is to control it using MQTT and Home Assistant. That way it can easily be automated to turn on when we’re home, if there is movement in the kitchen, or any number of conditions.

It’s really quite easy to do, here’s how 👇

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Two channel traffic lights controller — using Wemos

Two channel traffic lights controller — using Wemos

My kids wanted traffic lights for their LEGO city, so first I had to build a traffic lights controller.

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Kids alarm module, Raspberry Pi Zero, and MQTT

Kids alarm module, Raspberry Pi Zero, and MQTT
A kids alarm module, with buttons and lights. Powered by a Raspberry Pi Zero, connected to WiFi and MQTT.
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