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// Sample RFM69 sender/node sketch for mailbox motion sensor, with addition of
// Moteino WeatherShield for temp/humidity/atm pressure readings
// PIR motion sensor connected to D3 (INT1)
// When RISE happens on D3, the sketch transmits a "MOTION" msg to receiver Moteino and goes back to sleep
// It then wakes up every 32 seconds and sends a message indicating when the last
// motion event happened (days, hours, minutes, seconds ago) and the battery level
// In sleep mode, Moteino + PIR motion sensor use about ~78uA
// Make sure you adjust the settings in the configuration section below !!!
// **********************************************************************************
// Copyright Felix Rusu,
// Library and code by Felix Rusu -
// Get the RFM69 and SPIFlash library at:
// **********************************************************************************
// License
// **********************************************************************************
// This program is free software; you can redistribute it
// and/or modify it under the terms of the GNU General
// Public License as published by the Free Software
// Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A
// PARTICULAR PURPOSE. See the GNU General Public
// License for more details.
// You should have received a copy of the GNU General
// Public License along with this program.
// If not, see <>.
// Licence can be viewed at
// Please maintain this license information along with authorship
// and copyright notices in any redistribution of this code
// **********************************************************************************
#include <SFE_BMP180.h> //get it here:
#include <SI7021.h> //get it here:
#include <Wire.h>
#include <RFM69.h> //get it here:
#include <SPI.h> //get it here:
#include <LowPower.h> //get library from:
//writeup here:
#define NODEID 57 //unique for each node on same network
#define NETWORKID 250 //the same on all nodes that talk to each other
#define GATEWAYID 1
//Match frequency to the hardware version of the radio on your Moteino (uncomment one):
//#define FREQUENCY RF69_433MHZ
//#define FREQUENCY RF69_868MHZ
#define FREQUENCY RF69_915MHZ
#define IS_RFM69HW //uncomment only for RFM69HW! Leave out if you have RFM69W!
#define ENCRYPTKEY "sampleEncryptKey" //exactly the same 16 characters/bytes on all nodes!
#define SENDEVERYXLOOPS 4 //each loop sleeps 8 seconds, so send status message every this many sleep cycles (default "4" = 32 seconds)
#define MOTION_PIN 3 // D3
#define MOTION_IRQ 1 // hardware interrupt 1 (D3) - where motion sensors OUTput is connected, this will generate an interrupt every time there is MOTION
#define BATT_MONITOR_EN A3//enables battery voltage divider to get a reading from a battery, disable it to save power
#define BATT_MONITOR A7 //through 1Meg+470Kohm and 0.1uF cap from battery VCC - this ratio divides the voltage to bring it below 3.3V where it is scaled to a readable range
#define BATT_CYCLES 30 // read and report battery voltage every this many sleep cycles (ex 30cycles * 8sec sleep = 240sec/4min). For 450 cyclesyou would get ~1 hour intervals
#define BATT_FORMULA(reading) reading * 0.00322 * 1.47
#define LED 5 // Moteinos have LEDs on D9
//#define BLINK_EN //uncomment to make LED flash when messages are sent, leave out if you want low power
//#define SERIAL_EN //uncomment this line to enable serial IO debug messages, leave out if you want low power
#ifdef SERIAL_EN
#define SERIAL_BAUD 115200
#define DEBUG(input) {Serial.print(input); delay(1);}
#define DEBUGln(input) {Serial.println(input); delay(1);}
#define DEBUG(input);
#define DEBUGln(input);
SI7021 weatherShield_SI7021;
SFE_BMP180 weatherShield_BMP180;
RFM69 radio;
volatile boolean motionDetected=false;
char sendBuf[61];
byte sendLen;
byte sendLoops=0;
unsigned long MLO=0; //MailLastOpen (ago, in ms)
unsigned long now = 0, time=0, lastSend = 0, temp = 0;
float batteryVolts = 5;
char BATstr[12];
char Pstr[12];
void setup() {
#ifdef SERIAL_EN
#ifdef IS_RFM69HW
radio.setHighPower(); //uncomment only for RFM69HW!
attachInterrupt(MOTION_IRQ, motionIRQ, RISING);
char buff[50];
sprintf(buff, "\nTransmitting at %d Mhz...", FREQUENCY==RF69_433MHZ ? 433 : FREQUENCY==RF69_868MHZ ? 868 : 915);
//initialize weather shield sensors
if (weatherShield_BMP180.begin())
{ DEBUGln("BMP180 init success"); }
else { DEBUGln("BMP180 init fail\n"); }
void motionIRQ()
void loop() {
now = millis();
if (motionDetected && time-MLO > 30000) //avoid duplicates in 30second intervals (ie mailman sometimes spends 20+ seconds at mailbox)
MLO = time; //save timestamp of event
sprintf(sendBuf, "MOTION BAT:%sv", BATstr);
sendLen = strlen(sendBuf);
if (radio.sendWithRetry(GATEWAYID, sendBuf, sendLen))
DEBUGln(" ok!");
#ifdef BLINK_EN
else DEBUGln(" nothing...");
else sendLoops++;
//send readings every SENDEVERYXLOOPS
char periodO='X', periodC='X';
unsigned long lastOpened = (time - MLO) / 1000; //get seconds
unsigned long LO = lastOpened;
char* MLOstr="LO:99d23h59m";
char status;
if (lastOpened <= 59) periodO = 's'; //1-59 seconds
else if (lastOpened <= 3599) { periodO = 'm'; lastOpened/=60; } //1-59 minutes
else if (lastOpened <= 259199) { periodO = 'h'; lastOpened/=3600; } // 1-71 hours
else if (lastOpened >= 259200) { periodO = 'd'; lastOpened/=86400; } // >=3 days
if (periodO == 'd')
sprintf(MLOstr, "LO:%ldd%ldh", lastOpened, (LO%86400)/3600);
else if (periodO == 'h')
sprintf(MLOstr, "LO:%ldh%ldm", lastOpened, (LO%3600)/60);
else sprintf(MLOstr, "LO:%ld%c", lastOpened, periodO);
double P = getPressure();
P*=0.0295333727; //transform to inHg
dtostrf(P, 3,2, Pstr);
sprintf(sendBuf, "%s BAT:%sv F:%d H:%d P:%s", MLOstr, BATstr, weatherShield_SI7021.getFahrenheitHundredths(), weatherShield_SI7021.getHumidityPercent(), Pstr);
sendLen = strlen(sendBuf);
radio.send(GATEWAYID, sendBuf, sendLen);
DEBUG(sendBuf); DEBUG(" ("); DEBUG(sendLen); DEBUGln(")");
lastSend = time;
#ifdef BLINK_EN
Blink(LED, 5);
time = time + 8000 + millis()-now + 480; //correct millis() resonator drift, may need to be tweaked to be accurate
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
void Blink(byte PIN, int DELAY_MS)
pinMode(PIN, OUTPUT);
byte cycleCount=BATT_CYCLES;
void checkBattery()
if (cycleCount++ == BATT_CYCLES) //only read battery every BATT_CYCLES sleep cycles
unsigned int reading=0;
//enable battery monitor
digitalWrite(BATT_MONITOR_EN, LOW);
for (byte i=0; i<10; i++)
reading += analogRead(BATT_MONITOR);
//disable battery monitor
pinMode(BATT_MONITOR_EN, INPUT); //highZ mode will allow p-mosfet to be pulled high and disconnect the voltage divider on the weather shield
batteryVolts = BATT_FORMULA(reading/10);
DEBUG("reading:"); DEBUGln(reading);
dtostrf(batteryVolts, 3,2, BATstr);
cycleCount = 0;
double getPressure()
char status;
double T,P,p0,a;
// If you want sea-level-compensated pressure, as used in weather reports,
// you will need to know the altitude at which your measurements are taken.
// We're using a constant called ALTITUDE in this sketch:
// If you want to measure altitude, and not pressure, you will instead need
// to provide a known baseline pressure. This is shown at the end of the sketch.
// You must first get a temperature measurement to perform a pressure reading.
// Start a temperature measurement:
// If request is successful, the number of ms to wait is returned.
// If request is unsuccessful, 0 is returned.
status = weatherShield_BMP180.startTemperature();
if (status != 0)
// Wait for the measurement to complete:
// Retrieve the completed temperature measurement:
// Note that the measurement is stored in the variable T.
// Function returns 1 if successful, 0 if failure.
status = weatherShield_BMP180.getTemperature(T);
if (status != 0)
// Start a pressure measurement:
// The parameter is the oversampling setting, from 0 to 3 (highest res, longest wait).
// If request is successful, the number of ms to wait is returned.
// If request is unsuccessful, 0 is returned.
status = weatherShield_BMP180.startPressure(3);
if (status != 0)
// Wait for the measurement to complete:
// Retrieve the completed pressure measurement:
// Note that the measurement is stored in the variable P.
// Note also that the function requires the previous temperature measurement (T).
// (If temperature is stable, you can do one temperature measurement for a number of pressure measurements.)
// Function returns 1 if successful, 0 if failure.
status = weatherShield_BMP180.getPressure(P,T);
if (status != 0)
return P;
return 0;
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