Reporting Battery Level
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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 } -
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.
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* 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; } } }''' -
https://codebender.cc/sketch:337094 This is modified electricity meter sketch with battery level .
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https://codebender.cc/sketch:337094 This is modified electricity meter sketch with battery level .
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I bought 2AA batteries. Working.Domoticz devices page report battery level 3. How to see battery level graph ?
@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.
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@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
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