Hubitat with Homemade Temperature, Humidity, Pressure and Light sensor

iharyadi · October 24, 2020, 7:27pm

I have notice that there are some interest among community member to monitor power loss. I was going to post some links. However, I found there are many good post about it. If you are interested, you can use the community search function.

Today, I want to share a simple solution to monitor power loss using my sensor. This is an example of using the expand-ability of the sensor.

I make a simple circuit with a single resistor and voltage monitoring IC.

It attached to the expansion pad of the environment sensor. Soldering is optional.

Because the Sensor need to operate during power outage, a LIPO/Li-On battery is required.

I make a power detector child DTH.

github.com

iharyadi/hubitat/blob/master/Environment SensorEx/PowerDetector.groovy

metadata {
    definition (name: "Power Detector", namespace: "iharyadi", author: "iharyadi") {
        capability "PowerSource"
        capability "Sensor"
    }
    
    preferences {    
    }
}

def parse(String description) {  
    if(!description?.startsWith("read attr - raw:"))
    {
        return null;
    }
    
    def descMap = zigbee.parseDescriptionAsMap(description)
    
    def value = descMap.attrInt?.equals(0x0055) ? 
        descMap.value :

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In the Environment Sensor setting page, you can add the Power Detector child like so.

After that, you will a new device that will monitor whether the DC power to the sensor is down. You can use this to indicate power to the same segment you plugin the sensor to is down. You can use it in Rule machine to do anything you like.

I make 10 of the power monitoring circuit. I do not have a lot. I am going to give them as a bonus for those who purchase my sensor on Ebay. Please leave a note if you want one. I apologize for those who had purchased a sensor for me that I can't share it with you. The reason is the shipping cost will be more expensive than the cost of this circuit. But, please do send me your feedback whether you would be interested in such option. If I have gauge that there is enough demand, I could make the attachment circuit as an option to purchase. This should not be an expensive add on.

I hope it is an useful information for everyone. I think for some of us who already have the Environment running, adding a simple attachment that would get another useful information would be a big win.

Thanks
Iman