Issue with the implementation of low-power library for arduino zero

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1

I'm using a SAMD21G18A based board - the arduino zero, for a battery-powered wearable project (a type of computer mouse). I put the device into sleep using the sleep function from the arduino low-power library.

I think the board is going to sleep when I call the .deepSleep() function, using serial to print, as you can see in the picture below. Also including the relevant code.

My issue is that a connected LED continues to work even after the device is put to sleep. The way I understood it, sleep should cut power to attached peripherals. Am I doing something wrong?

I looked through the source code from the library, but that was a dead end. Has anyone experienced a similar issue before?

void nomotion_sleep(float x_value) {
  static float asum;
  static byte i = 0;
  static byte numberof_samples = 10;
  static float sleep_threshold = numberof_samples + 5;
  static uint32_t sleep_timer;

  if (timer1(sleep_timer, 10000)) {
    asum += fabs(x_value);
    SerialUSB.println (asum);
    i += 1;
    if (i == numberof_samples - 1) {
      if (asum < sleep_threshold) {
        asum = 0;
        SerialUSB.println ("sleep now");
        //sleep
        LowPower.deepSleep();
      }
      asum = 0;
      i = 0;
    }
  }
}

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2

is it the Uno sized Arduino Zero with the EDBG chip (two USB connectors)?
or is it an Arduino MKR Zero?

3

Hi juraj, I'm not sure but it does have two ports. I got this one as a present, but think it's the one currently being sold.

4

You are wrong in this! Set variables to the current state, and turn them off before going to sleep, tern them back to te stored states on wakeup.

5

@missdrew So sleep mode is not supposed to turn off peripherals such as LEDs? I should manually turn them off before going into sleep?

6

That is correct.

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7

I think you can't put the EDBG chip to sleep and I guess it has higher consumption than the SAMD.

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8

@missdrew thank you. doesn't seem it accomplishes a whole lot then.

@Juraj hmm, I can investigate

9

Appart from going to sleep, saving energy.

1 Like
10

Sorry I realize I sounded a bit rude there. Thank you for spending the time helping.

11

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