Standby MKR NB 1500

[pat7729]

Hello,
I would like my MKR NB 1500 card to acquire data and send it via GSM every hour. I use Arduino Cloud. Between the two measurements, let the card go to sleep.
Not successful with RTCZERO and Arduinolowpower.
Do you have any ideas ?
Thank you in advance

#include "thingProperties.h"
#include "DHT.h"
#include "HX711.h"
#include "OneWire.h"
#include "DallasTemperature.h"
//#include "ArduinoLowPower.h"
//#include <RTCZero.h>

//RTCZero rtc; // initialisation de la librairie de l’horloge
//bool matched = true; // booleen condition alarme

const int sensorPin = 0; //D0

const int ONE_WIRE_BUS = 1;  //D1

// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 4;    //D4
const int LOADCELL_SCK_PIN = 5;    //D5

HX711 scale;

DHT dht(sensorPin, DHT22);

//Création d’une instance OneWire
OneWire oneWire(ONE_WIRE_BUS);

//Transfert des informations du capteur étanche
DallasTemperature sensors (&oneWire);

void setup() {
  
    pinMode (sensorPin, OUTPUT);

    pinMode (ONE_WIRE_BUS, OUTPUT);
  
  // Initialize serial and wait for port to open:
  //--Serial.begin(9600);
  // This delay gives the chance to wait for a Serial Monitor without blocking if none is found
  //--delay(1500);
  
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(6, OUTPUT); // LED_BUILTIN
  digitalWrite(6, LOW);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, OUTPUT);  // SPI - MOSI
  digitalWrite(8, LOW);
  pinMode(9, OUTPUT);  // SPI - SCK
  digitalWrite(9, LOW);
  pinMode(10, INPUT_PULLUP);
  pinMode(13, INPUT_PULLDOWN);
  pinMode(14, INPUT_PULLDOWN);
 
  
   dht.begin();
   //rtc.begin(); // initialisation horloge
   sensors.begin();
   
   scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
   
   scale.set_scale(-19.64585); //renter la valeur de la tare
   
   scale.tare();               // reset the scale to 0

  
  // Defined in thingProperties.h
  initProperties();

  // Connect to Arduino IoT Cloud
  ArduinoCloud.begin(ArduinoIoTPreferredConnection);

 
  //--setDebugMessageLevel(2);
  //--ArduinoCloud.printDebugInfo();
}

void loop() {

  //if (matched){ // condition : si booleen "matched" vrai
  //matched = false; // booleen devient faux

  ArduinoCloud.update();
  dhtSensorReading();
  sensors.requestTemperatures();
  capteur_temp = sensors.getTempCByIndex(0);

  //Serial.println(scale.get_units(10), 0);
  
  masse = scale.get_units(1);


//int alarmMinutes = rtc.getMinutes(); // enregistre l’heure (minutes)
//int alarmHours = rtc.getHours(); // enregistre l’heure (heures)
//alarmMinutes += 0; // reglage de la prochaine alarme (intervalle)
//alarmHours += 1;
//if (alarmMinutes > 59) { // boucle empechant les minutes de depasser 60
//alarmMinutes -= 60;
//alarmHours += 1;}
//if(alarmHours > 23) { // boucle empechant les heures de depasser 24
//alarmHours -= 24;}
//rtc.setAlarmTime(alarmHours, alarmMinutes, 00); // regle la prochaine alarme
//rtc.enableAlarm(rtc.MATCH_HHMMSS); // active l’alarme
//rtc.attachInterrupt(alarmMatch); // alarme = change booleen "matched"
//rtc.standbyMode();} // mise en veille
  
  //delay(55000);

  //LowPower.sleep(8000);
}

void dhtSensorReading(){
   temperature = dht.readTemperature();
   humidity = dht.readHumidity(); 
}


 
//void alarmMatch(){ // fonction changeant "matched" en "true"
//matched=true;
//}>

[intstarep]

IMHO this won't work. The MKR and the modem (SARA) are two complete independent MCU's communicating over the AT console. If you send the MKR to sleep, the modem will not notice and the communication will be lost. I assume if you sync the sleeps (Modem sleeps first, then the MKR, MKR awakes up first, then the modem) it might be succesful.
Anyway, is it really neccesary to let them sleep. Short of power?

[pat7729]

Hello,
Thank you for your expertise.
Operation is on battery and solar panel, so yes, I am looking for the best efficiency.
My system's consumption is around 80mA all the time, even though it only sends data a few milliseconds once an hour. The idea is to drop a few milliamperes between the two emissions.