Reporting Battery Level

[Fat Fly]

How to add to sketch this feature? I use Domoticz controller and serial gateway. Nodes is Arduino mini pro 3,3V with batteries. Today i use door open/close sensor, elecricity meter, moisture sensor.

[bjacobse]

I don't have my sketch available, but I used this code below for measuring 2xAA. I have changed #define MIN_V 1900 (milliVolt) since I have disabled BOD, so Arduino runs to 1,8V, bur NRF24L01+ is working down t0 1,9V
NOTE: This is only showing battery measuring, it's not a full sketch...

  void loop() 
  {
  #define MIN_V 2700
  #define MAX_V 3200
  int batteryPcnt = min(map(readVcc(), MIN_V, MAX_V, 0, 100), 100); // Convert voltage to percentage
  gw.sendBatteryLevel(batteryPcnt); // Send battery percentage to gateway
   
  } 
  long readVcc() {
    // Read 1.1V reference against AVcc
    // set the reference to Vcc and the measurement to the internal 1.1V reference
    #if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
      ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
    #elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
      ADMUX = _BV(MUX5) | _BV(MUX0);
    #elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
      ADMUX = _BV(MUX3) | _BV(MUX2);
    #else
      ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
    #endif  
   
    delay(2); // Wait for Vref to settle
    ADCSRA |= _BV(ADSC); // Start conversion
    while (bit_is_set(ADCSRA,ADSC)); // measuring
   
    uint8_t low  = ADCL; // must read ADCL first - it then locks ADCH  
    uint8_t high = ADCH; // unlocks both
   
    long result = (high<<8) | low;
   
    result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
    return result; // Vcc in millivolts
  }

[Fat Fly]

Okay. I understand but how to add this piece from software to each sketch? Each what arduino powerted from batteryes.

[AWI]

@Fat-Fly Easiest way is to use the Vcc library by @Yveaux

[Fat Fly]

This is better. I need cut off Arduino voltage regulator and power led ?

[AWI]

@Fat-Fly To save power you can... but not needed for the Vcc library to work if you power your pro-mini from the vcc pin

[Fat Fly]

Ok. I try to write sketch.

[Fat Fly]

 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * DESCRIPTION
 *
 * Simple binary switch example 
 * Connect button or door/window reed switch between 
 * digitial I/O pin 3 (BUTTON_PIN below) and GND.
 * http://www.mysensors.org/build/binary
 */


#include <MySensor.h>
#include <SPI.h>
#include <Bounce2.h>
#include <Vcc.h>


#define CHILD_ID 3
#define BUTTON_PIN  3  // Arduino Digital I/O pin for button/reed switch

MySensor gw;
Bounce debouncer = Bounce(); 
int oldValue=-1;

// Change to V_LIGHT if you use S_LIGHT in presentation below
MyMessage msg(CHILD_ID,V_TRIPPED);


//battery voltage
const float VccExpected   = 3.0;
const float VccCorrection = 2.860/2.92;  // Measured Vcc by multimeter divided by reported Vcc
Vcc vcc(VccCorrection);

static int oldBatteryPcnt = 0;

void setup()  
{  
  gw.begin();

 // Setup the button
  pinMode(BUTTON_PIN,INPUT);
  // Activate internal pull-up
  digitalWrite(BUTTON_PIN,HIGH);
  
  // After setting up the button, setup debouncer
  debouncer.attach(BUTTON_PIN);
  debouncer.interval(5);
  
  // Register binary input sensor to gw (they will be created as child devices)
  // You can use S_DOOR, S_MOTION or S_LIGHT here depending on your usage. 
  // If S_LIGHT is used, remember to update variable type you send in. See "msg" above.
  gw.present(CHILD_ID, S_DOOR);  
}


//  Check if digital input has changed and send in new value
void loop() 
{
  debouncer.update();
  // Get the update value
  int value = debouncer.read();
 
  if (value != oldValue) {
     // Send in the new value
     gw.send(msg.set(value==HIGH ? 1 : 0));
     oldValue = value;
  }
  {
    int batteryPcnt = (int)vcc.Read_Perc(VccExpected);
    if (oldBatteryPcnt != batteryPcnt)
    {
        gw.sendBatteryLevel(batteryPcnt);
        oldBatteryPcnt = batteryPcnt;
    }
}
  
  
}'''

[Fat Fly]

Verification successful says codebender. I do not know working this or not. I can't try. Only in home after working day.

[Fat Fly]

https://codebender.cc/sketch:337094 This is modified electricity meter sketch with battery level .

[Nuubi]

@Fat-Fly Nice, interested to try this also.
Any idea how long the batteries will last? Electricity meters tend to blink quite often, so not that much sleep..

[Fat Fly]

At the moment i try this with 2xAA recargeable batteryes but no luck. Gnd and vcc pin. Not working , not reported. if i find batterys.... I search. All remotes is AAA 2.68volts from recargeable AA's. where is the fish ?

[Fat Fly]

From recargeable 2x AA and 2,68V not working.

[Fat Fly]

I bought 2AA batteries. Working.Domoticz devices page report battery level 3. How to see battery level graph ?

[AWI]

@Fat-Fly to report battery voltage you have to create a S_MULTIMETER sensor and send the voltage with V_VOLTAGE.

Sendbatterylevel only changes the battery level in Domoticz in % and can not be shown separate.

Tot use your arduino with low voltages you need to change the fuse settings (BOD) with an ISP programmer.

[Fat Fly]

How to i do this ?

[AWI]

@Fat-Fly I will post some code later when I get to a pc.

[Fat Fly]

@AWI said:

@Fat-Fly I will post some code later when I get to a pc.

This is great. I do not find from google search. My mother tongue is Estonian

[AWI]

@Fat-Fly "Estonia: Between East, West and the World"

These are the lines of code which should do the trick... you need to put them in the right spot yourself

#define VOLTAGE_CHILD_ID 		5

MyMessage voltageMsg(VOLTAGE_CHILD_ID, V_VOLTAGE);	// Node voltage

gw.present(VOLTAGE_CHILD_ID, S_MULTIMETER, "Battery " );
	
float voltage = vcc.Read_Volts() ;
gw.send(voltageMsg.set(voltage,2));				//send battery in Volt 
		

[Fat Fly]

Estonia between world and russia.

[alexsh1]

@Fat-Fly I am not sure how you intend to arrange your electricity pulse meter reading, but in my case I had to wire Pro Mini 5V to mains or otherwise recharge a battery every 5-7 days. I think you can do the total kWh and putting Pro Mini to sleep, but you cannot have total consumption kWh and current consumption kW with sleeping.

[Fat Fly]

Yesterday this not working. KW reader is too away from gateway.My house is lenght is 22m. Electricity meter is one end of house and gateway is center house. can i use repeater on something other. I use for this nrf with antenna.

[mfalkvidd]

@Fat-Fly check the "range issues" troubleshooting flowchart at https://forum.mysensors.org/topic/666/debug-faq-and-how-ask-for-help