bretti_kivi
Member
So I've been thinking about this winter. Yes, we already have frost...
We have the DEFA Termini in the car(s). They are plugged into the wall and run around 2kW of heat into the cabin. I don't want to run this any longer than necessary. I do want to run it long enough for the cabin to be warm in the morning before leaving.
We currently have a Clas Ohlson switch for this and it's pretty good. But it has its own clock, so it's always wrong and I think I can do better.
Right now, I'm thinking about using ZigBee with some Arduinos (or more likely a Wemos D1) to monitor temperature. And then to have a server service running which says "departure time is at 0730, it's -15C, so the car needs to start preheating at 0530. It is 0530, turn the socket on".
This isn't as trivial as I hoped - I picked up an Ikea Trådfri gateway, but it won't do what I was hoping for, certainly not with the thermometer input. I also want a display and override, along with a feedback loop so if the car is "too warm", the heater is turned off again.
Not 100% sure how I'm going to do this, but I figure a temperature sensor in the car and another outside is going to be a starting point. That and a remote-controllable socket. I think I have those things with Zigbee connectivity. The next bit is going to be the automation, after I've connected everything up.
To be continued...
We have the DEFA Termini in the car(s). They are plugged into the wall and run around 2kW of heat into the cabin. I don't want to run this any longer than necessary. I do want to run it long enough for the cabin to be warm in the morning before leaving.
We currently have a Clas Ohlson switch for this and it's pretty good. But it has its own clock, so it's always wrong and I think I can do better.
Right now, I'm thinking about using ZigBee with some Arduinos (or more likely a Wemos D1) to monitor temperature. And then to have a server service running which says "departure time is at 0730, it's -15C, so the car needs to start preheating at 0530. It is 0530, turn the socket on".
This isn't as trivial as I hoped - I picked up an Ikea Trådfri gateway, but it won't do what I was hoping for, certainly not with the thermometer input. I also want a display and override, along with a feedback loop so if the car is "too warm", the heater is turned off again.
Not 100% sure how I'm going to do this, but I figure a temperature sensor in the car and another outside is going to be a starting point. That and a remote-controllable socket. I think I have those things with Zigbee connectivity. The next bit is going to be the automation, after I've connected everything up.
To be continued...