Tips for maximum battery optimization on MKR1310

Official Hardware MKR Family MKR WAN 1310
1

Hello, after much research I found the best battery optimization for MKR1310 :
here is the code :

#include <LoRa.h>
#include <ArduinoLowPower.h>
#include <Arduino_PMIC.h>

//#define DEBUG

#ifdef DEBUG
  #define DEBUG_PRINT(x) Serial.print(x)
  #define DEBUG_PRINTLN(x) Serial.println(x)
#else
  #define DEBUG_PRINT(x)
  #define DEBUG_PRINTLN(x)
#endif

#define LED_BUILTIN 6

unsigned long previousMillis = 0;

int PMIC_Status;
bool PMIC_PowerGood;

const int pin = 0;

void setup() {
#ifdef DEBUG
  Serial.begin(9600);
  while (!Serial);
#endif

  for (int i = 0; i <= 14; i++) {
    pinMode(i, INPUT_PULLUP);
  }

  if (!PMIC.begin()) DEBUG_PRINTLN("PMIC initialization error!");
  else DEBUG_PRINTLN("PMIC initialized!");
  
  // LoRa Example
  if (!LoRa.begin(868E6)) DEBUG_PRINTLN("LoRa startup failed!");
  else DEBUG_PRINTLN("LoRa startup OK !");
  
  LoRa.setSpreadingFactor(7);
  LoRa.setSignalBandwidth(500E3);
  LoRa.setCodingRate4(6);
  LoRa.enableCrc();

  // For a 3.7V 5000mAh Battery
  PMIC.setInputCurrentLimit(2.0);
  PMIC.setInputVoltageLimit(3.88);
  PMIC.setMinimumSystemVoltage(3.5);
  PMIC.setChargeVoltage(4.2);
  PMIC.setChargeCurrent(1.0);

  DEBUG_PRINTLN("Adjusted load parameters !");
  if (!PMIC.enableCharge()) DEBUG_PRINTLN("Error enabling Charge mode");

  USBDevice.detach();
  if (!Serial) Serial.end();

  // Arduino wake-up on the "pin"
  LowPower.attachInterruptWakeup(pin, wakeUp, FALLING);
}

void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= 1000) {
    previousMillis = currentMillis;
    PMIC_Status = PMIC.chargeStatus();
    PMIC_PowerGood = PMIC.isPowerGood();
  }

  if (PMIC_PowerGood) {
    if (PMIC_Status == PRE_CHARGING || PMIC_Status == FAST_CHARGING) {
      // Battery is charging
    }
    else if (PMIC_Status == CHARGE_TERMINATION_DONE) {
      // Battery is full
    } else {
      // Error Charging
    }
  }
}

// MKR Deep Sleep Function
void Veille() {
  DEBUG_PRINTLN("Mise en veille...");
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  //
  USBDevice.detach();
  Serial.end();
  LoRa.end();
  ADC->CTRLA.bit.ENABLE = 0;
  while (ADC->STATUS.bit.SYNCBUSY);
  //
  digitalWrite(LORA_IRQ_DUMB, LOW);
  digitalWrite(LORA_BOOT0, LOW);
  digitalWrite(LORA_RESET, LOW);
  pinMode(LORA_IRQ_DUMB, INPUT);
  pinMode(LORA_BOOT0, INPUT);
  pinMode(LORA_RESET, INPUT);
  //
  LowPower.deepSleep();
}

void wakeUp() {
  // Restart LoRa
    if (!LoRa.begin(868E6)) DEBUG_PRINTLN("LoRa startup failed!");
  else DEBUG_PRINTLN("LoRa startup OK !");

  // Reset if you want
  //NVIC_SystemReset();
  }
2

What is your question?
I challenge 'best'. Is the current used in the 'sleep' state >0?

3

Where is the Arduino_PMIC located, I can't find it in the LibraryManager or github.

4

This is not a question but as a help as I had trouble doing it! The standby current obtained is <140uA with a voltage divider bridge on A0 to measure the battery voltage.

you can find arduino PMIC here :