Battery Sensor / Voltage Monitor

[jeylites]

After restarting the node, I do see the battery % on Arduino Node . Question is, how do you make it to show up as a sensor. It will be great to have it show voltage too.

[AWI]

@jeylites You are presenting the sensor as V_VOLTAGE (value=38). The sensor should present itself with a S_.... message. eg S_POWER (value=13) to be recognized correctly. Have a look at the API/ Serial spec

[hek]

S_VOLTAGE has not been implemented on vera (someone needs to create the device-files).

But I don't think you need to present anything at all. The Battery level is added to the Node-device which is automatically created.

[jeylites]

@hek That explains why it's not working

Here is a screen shot of my setup.

[hek]

Sidedote: Hmm.. the gui looks awful on UI7. Why doesn't it break the text into lines?

[jeylites]

@hek
I couldn't agree more. I saw somewhere in My Sensor someone posted a way to make that go away but I can't seem to find it.

[hek]

You are running the UI7 branch right?
https://github.com/mysensors/Vera/tree/UI7

[jeylites]

@hek Yes sir!

I added all these files below into Luup

[jeylites]

@hek
I did not know what this does so I did not add....

[hek]

@jeylites said:

I did not know what this does so I did not add....

No they should not be added.

If someone has the time to adjust the UI7 GUI a bit I would appreciate it. There are a lot of whitespace above the icon. I hope that space is available to use by the device. If not, is sucks.

[jeylites]

@hek out of curiosity, I was checking out the sketch for Sensebender and saw that it had a Child Id for Battery Sensor and Voltage sensor. How does this work as a Child id?

Since Voltage is not available on Vera at this time , I'm assuming I will not be able to use this feature... correct?

[hek]

I think it is supported in Domoticz. But we better ping @tbowmo for a better explanation. It will simply be ignored in Vera.

[tbowmo]

@jeylites @hek

That battery ChildId is a leftover, from some earlier monitoring that I did, to monitor batteryvoltage decrease. Back then I used pidome as controler.

For a long time it has only reported battery percentage with the following routine

/********************************************
 *
 * Sends battery information (battery percentage)
 *
 * Parameters
 * - force : Forces transmission of a value
 *
 *******************************************/
void sendBattLevel(bool force)
{
  if (force) lastBattery = -1;
  long vcc = readVcc();
  if (vcc != lastBattery) {
    lastBattery = vcc;
    // Calculate percentage

    vcc = vcc - 1900; // subtract 1.9V from vcc, as this is the lowest voltage we will operate at
    
    long percent = vcc / 14.0;
    gw.sendBatteryLevel(percent);
  }
}

There are a couple of variable references back in the code at github, for the old battery voltage childId. These where removed last night, while I did some cleanup of the code. The changes are not pushed to github yet, as I haven't tested it yet.

[stamag]

How can I present the value in Voltage (for example 3.06 V)? I don't like the "Battery monitor".

I have got the multiple temperature meter (DHT + Dallas) working very well. Would be nice to have battery level in volts also.

Cheers!

[mikemayers]

@stamag That depends on the kind of controller employed.

There is no plugin for Vera according to @hek .

S_VOLTAGE has not been implemented on vera (someone needs to create the device-files).

But I don't think you need to present anything at all. The Battery level is added to the Node-device which is automatically created.

[AWI]

@stamag I don't know exactly which sensors are supported in vera but you could possibly 'trick' the voltage on a custom V_VAR type.

[stamag]

This post is deleted!

[jeylites]

If I'm measuring a 5.2 volt battery, what value should R1 and R2 be?

If the measuring voltages goes beyond the set voltage will that destroy the Arduino's input (A0)?

[stamag]

@jeylites You may change R1 and R2 and you don't destroy (A0).

An other way is to change the multiplicator (0.003363075) in the formula:
float batteryV = sensorValue * 0.003363075;