Hi Everyone,
I have a quick update. Here is another device that I am working on that harvest energy from heat as its power.
As you may have seen on the original video, I made a BLE sensor that can be used to detect whether your Gas stove is on or off. I have consider many pro and cons. I decided to support Zigbee rather than BLE. Going this route require me to design a hybird power source rather than pure autonomous sensor that is powered from the heat. However, for Hubitat users (all of us here), it is just much more convenient as ZigBee is natively supported.
Here are some pictures of the board.
Here is my test setup. I plan to hide the module under the stove in the future.
One thing that it can do is to do rough measurement to the heat in voltage. It is not precise but we would be able to tell how high is the burner is set to. The sensor use 2 AA battery. Since I will try to hide it and it may not be convenient to replace the battery every couple of years if I use smaller battery, I would go all the way with much higher capacity battery for long battery life. I expect that it should last 10+ years with the battery alone. The harvester will add to the battery life especially if the stove is use frequently.
One of the thing that I can do with Hubitat is to have it announce when the stove is in use on google home.
Thanks
Iman
