Battery Sensor / Voltage Monitor

[jeylites]

Guys,

This sketch compiled but doesn't work. I wondering if some one could have a look at it and see what I have done wrong. Cheers!

Serial Logs

sensor started, id 1
send: 1-1-0-0 s=255,c=0,t=17,pt=0,l=5,st=ok:1.4.1
send: 1-1-0-0 s=255,c=3,t=6,pt=1,l=1,st=ok:0
send: 1-1-0-0 s=255,c=3,t=11,pt=0,l=13,st=ok:Battery Meter
send: 1-1-0-0 s=255,c=3,t=12,pt=0,l=3,st=ok:1.0
send: 1-1-0-0 s=20,c=0,t=38,pt=0,l=5,st=ok:1.4.1
1023
Battery Voltage: 3.44 V
Battery percent: 102 %
send: 1-1-0-0 s=255,c=3,t=0,pt=1,l=1,st=ok:102

// This is an example that demonstrates how to report the battery level for a sensor
// Instructions for measuring battery capacity on A0 are available in the follwoing forum
// thread: http://forum.micasaverde.com/index.php/topic,20078.0.html

#include <SPI.h>
#include <MySensor.h>

#define CHILD_ID_BATT 20
int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point

MySensor gw;

MyMessage msgBattery(CHILD_ID_BATT, V_VOLTAGE);
unsigned long SLEEP_TIME = 900000;  // sleep time between reads (seconds * 1000 milliseconds)
int oldBatteryPcnt = 0;

void setup()  
{
   // use the 1.1 V internal reference
   analogReference(INTERNAL);
   gw.begin();

   // Send the sketch version information to the gateway and Controller
   gw.sendSketchInfo("Battery Meter", "1.0");
   
  gw.present(CHILD_ID_BATT, V_VOLTAGE);
}

void loop()
{
   // get the battery Voltage
   int sensorValue = analogRead(BATTERY_SENSE_PIN);
   Serial.println(sensorValue);
   
   // 1M, 470K divider across battery and using internal ADC ref of 1.1V
   // Sense point is bypassed with 0.1 uF cap to reduce noise at that point
   // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts
   // 3.44/1023 = Volts per bit = 0.003363075
   float batteryV  = sensorValue * 0.003363075;
   int batteryPcnt = sensorValue / 10;

   Serial.print("Battery Voltage: ");
   Serial.print(batteryV);
   Serial.println(" V");

   Serial.print("Battery percent: ");
   Serial.print(batteryPcnt);
   Serial.println(" %");

   if (oldBatteryPcnt != batteryPcnt) {
     // Power up radio after sleep
     gw.sendBatteryLevel(batteryPcnt);
     oldBatteryPcnt = batteryPcnt;
   }
   gw.sleep(SLEEP_TIME);
}

[AWI]

@jeylites From what I see the sketch is working fine except that it is reporting a 102% battery level So it could be that your controller is not interpreting the message or that you are expecting the Voltage to show up as a sensor. To do the last you have to send it with your the 'msgBattery' message. Which controller are you using?

[Sweebee]

Everything looks fine.

this is send to the gw send: 1-1-0-0 s=255,c=3,t=0,pt=1,l=1,st=ok:102

Maybe the controller doesn't accept higher than 100.

Your voltage is higher than 3.363V so thats why its 102%.

add this just after int batteryPcnt - sensorValue / 10;

if(batteryPcnt > 100)
{
   batteryPcnt = 100;
}

or

batteryPcnt = min(batteryPcnt, 100);

[jeylites]

@ AWI

good to hear from you Yes, I will like it to show up as a sensor, I'm using Vera Edge.

@Sweebee

I'm going to make the change and see if it works. Will report back guys!

[jeylites]

It actually comes up as Arduino Door... very odd. Still can't get voltage or battery level to show up.

[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;