BatteryPoweredSensorInternal.ino

/*
   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 <[email protected]>
   Copyright (C) 2013-2022 Sensnology AB
   Full contributor list: https://github.com/mysensors/MySensors/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
 
   This is an example that demonstrates how to report the battery level for a sensor
   using the internal measurement method.
   Instructions for measuring battery capacity are available here:
   http://www.mysensors.org/build/battery
 
*/
 
// Enable debug prints to serial monitor
#define MY_DEBUG
 
// Enable and select radio type attached
#define MY_RADIO_RF24
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95
 
#include <MySensors.h>
 
uint32_t SLEEP_TIME = 900000;  // sleep time between reads (seconds * 1000 milliseconds)
int oldBatteryPcnt = 0;
#define FULL_BATTERY 3 // 3V for 2xAA alkaline. Adjust if you use a different battery setup.
 
void setup()
{
}
 
void presentation()
{
    // Send the sketch version information to the gateway and Controller
    sendSketchInfo("Battery Meter", "1.0");
}
 
void loop()
{
    // get the battery Voltage
    long batteryMillivolts = hwCPUVoltage();
    int batteryPcnt = batteryMillivolts / FULL_BATTERY / 1000.0 * 100 + 0.5;
#ifdef MY_DEBUG
    Serial.print("Battery voltage: ");
    Serial.print(batteryMillivolts / 1000.0);
    Serial.println("V");
    Serial.print("Battery percent: ");
    Serial.print(batteryPcnt);
    Serial.println(" %");
#endif
 
    if (oldBatteryPcnt != batteryPcnt) {
        sendBatteryLevel(batteryPcnt);
        oldBatteryPcnt = batteryPcnt;
    }
    sleep(SLEEP_TIME);
}