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Topic: MKR Zero uA sleep current (Read 923 times) previous topic - next topic

LDBM

Hi,

I am looking at what is achievable in terms of sleep current with a MKR Zero.  On the MKRWAN1310 forum it looks like ~ 100uA is achievable. As posted there I can only get to ~ 600uA. I am re-posting my code below.


I am using a MKR Zero, powered via the J2 pin with a 3.7 Lipo batt. I measure the current with a CurrentRanger.

I started from the RTC example, tried both the rtc.standbyMode() and LowPower.deepSleep() calls : same result.


Any help appreciated. Thx.


Code: [Select]

#include <RTCZero.h>
#include <ArduinoLowPower.h>

/* Create an rtc object */
RTCZero rtc;

/* Change these values to set the current initial time */
const byte seconds = 0;
const byte minutes = 00;
const byte hours = 17;

/* Change these values to set the current initial date */
const byte day = 24;
const byte month = 11;
const byte year = 20;

void setup()
{
   // Set digital pins to input  to save on current drain
 for (int i=0; i < 15; i++)
 {
   pinMode(i, INPUT_PULLUP);
 }
 
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);

  rtc.begin();

  rtc.setTime(hours, minutes, seconds);
  rtc.setDate(day, month, year);

  rtc.setAlarmTime(17, 00, 20);
  rtc.enableAlarm(rtc.MATCH_HHMMSS);

  rtc.attachInterrupt(alarmMatch);

  // detach USB so chip is asleep
  USBDevice.detach();
  rtc.standbyMode();
}

void loop()
{
  //rtc.standbyMode();    // Sleep until next alarm match
  LowPower.deepSleep();
}

void alarmMatch()
{
  digitalWrite(LED_BUILTIN, HIGH);
  USBDevice.attach();
}



LDBM

Resolved:  see this thread.  , MKR Zero sleep with ~ 65uA


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