83 lines
2.5 KiB
Arduino
83 lines
2.5 KiB
Arduino
/**
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* The MySensors Arduino library handles the wireless radio link and protocol
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* between your home built sensors/actuators and HA controller of choice.
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* The sensors forms a self healing radio network with optional repeaters. Each
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* repeater and gateway builds a routing tables in EEPROM which keeps track of the
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* network topology allowing messages to be routed to nodes.
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*
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* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
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* Copyright (C) 2013-2015 Sensnology AB
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* Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
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*
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* Documentation: http://www.mysensors.org
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* Support Forum: http://forum.mysensors.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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*******************************
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*
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* DESCRIPTION
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*
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* This is an example that demonstrates how to report the battery level for a sensor
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* Instructions for measuring battery capacity on A0 are available here:
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* http://www.mysensors.org/build/battery
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*
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*/
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#include <SPI.h>
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#include <MySensor.h>
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#define DEBUG 1 // Debug enables Serial.print 1 = Yes 0 = No
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int BATTERY_SENSE_PIN = A0; // select the input pin for the battery sense point
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MySensor gw;
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unsigned long SLEEP_TIME = 900000; // sleep time between reads (seconds * 1000 milliseconds)
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int oldBatteryPcnt = 0;
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void setup()
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{
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// use the 1.1 V internal reference
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analogReference(INTERNAL);
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gw.begin();
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// Send the sketch version information to the gateway and Controller
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gw.sendSketchInfo("Battery Meter", "1.0");
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}
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void loop()
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{
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// get the battery Voltage
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int sensorValue = analogRead(BATTERY_SENSE_PIN);
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#if DEBUG > 0
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Serial.println(sensorValue);
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#endif
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// 1M, 470K divider across battery and using internal ADC ref of 1.1V
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// Sense point is bypassed with 0.1 uF cap to reduce noise at that point
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// ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts
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// 3.44/1023 = Volts per bit = 0.003363075
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float batteryV = sensorValue * 0.003363075;
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int batteryPcnt = sensorValue / 10;
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#if DEBUG > 0
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Serial.print("Battery Voltage: ");
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Serial.print(batteryV);
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Serial.println(" V");
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Serial.print("Battery percent: ");
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Serial.print(batteryPcnt);
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Serial.println(" %");
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#endif
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if (oldBatteryPcnt != batteryPcnt) {
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// Power up radio after sleep
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gw.sendBatteryLevel(batteryPcnt);
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oldBatteryPcnt = batteryPcnt;
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}
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gw.sleep(SLEEP_TIME);
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}
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