Putting Teensy 4.0 to sleep does not reduce power consumption?

[ColdFire]

The Teensy consumes 30 to 33 mA regardless if in sleep or not. What am I doing wrong here?

This is the code:

#include <Snooze.h>

SnoozeDigital digital;
SnoozeTimer timer;

SnoozeBlock config_teensy40(digital, timer);

void setup()
{
timer.setTimer(10);
}

void loop()
{

Snooze.sleep( config_teensy40 );

for (int i = 0; i < 4; i++)
{
digitalWrite(LED_BUILTIN, HIGH);
delay(500);
digitalWrite(LED_BUILTIN, LOW);
delay(500);
}
}

[PaulS]

If I understand this page correctly then timer.setTimer(10); instructs the Teensy to sleep for 10 milliseconds only and then wakeup and flash the LED for 4 secs. That will indeed not show a lower power consumption.
But I could be wrong in interpreting the API...

Paul

[ColdFire]

For the Teensy 4.0 this is seconds as far as I understood it.

Karl

[BriComp]

The Teensy consumes 30 to 33 mA regardless if in sleep or not. What am I doing wrong here?

This is the code:

#include <Snooze.h>

SnoozeDigital digital;
SnoozeTimer timer;

SnoozeBlock config_teensy40(digital, timer);

void setup()
{
timer.setTimer(10);
}

void loop()
{

Snooze.sleep( config_teensy40 );

for (int i = 0; i < 4; i++)
{
digitalWrite(LED_BUILTIN, HIGH);
delay(500);
digitalWrite(LED_BUILTIN, LOW);
delay(500);
}
}

Firstly could you enclose any code posted between CODE tags using the # button as I have done below.

#include <Snooze.h>

SnoozeDigital digital;
SnoozeTimer timer;

SnoozeBlock config_teensy40(digital, timer);

void setup()
{
	timer.setTimer(10);
}

void loop()
{

	Snooze.sleep(config_teensy40);

	for (int i = 0; i < 4; i++)
	{
		digitalWrite(LED_BUILTIN, HIGH);
		delay(500);
		digitalWrite(LED_BUILTIN, LOW);
		delay(500);
	}
}

As far as your code goes, I don't know if it makes any difference but you have specified a digital sleep component but not initialised it.
As I said I don't if it makes any difference but make some changes and give it a try.

[PaulS]

For the Teensy 4.0 this is seconds as far as I understood it.

Karl

You're right, it's stated on the page...

/************************************************** ******
* Set Low Power Timer wake up in milliseconds T3.x/LC,
* seconds T4.x.
************************************************** ******/

Paul

[ColdFire]

I copied this from the example code

sleep_all_wakeups.ino

that can be found in the examples of the Snooze library in hardware\teensy\avr\libraries\Snooze\examples\slee p\

Karl

[joepasquariello]

I tried the OP's program with both T4.0 and T4.1, and as soon as it gets loaded the Teensy crashes and does 9 blinks, which means...

9 Blinks = ARM JTAG DAP Init Error
The ARM JTAG DAP was detected (4 blinks) but could not be initialized. This error is rather unlikely!

So, I tried several of the Snooze Example programs, and they all have the same effect on both T4.0 and T4.1

I'm using Arduino 1.8.19 and TD 1.58b3

[BriComp]

I copied this from the example code

sleep_all_wakeups.ino

that can be found in the examples of the Snooze library in hardware\teensy\avr\libraries\Snooze\examples\slee p\

Karl

Yes and deleted all the parameters which you did not require, unfortunately YOU DID NOT delete the digital parameter.
As I said I don't know if it will make any difference but without setting up the digital component you could have some un-initialised wake up states causing a premature wake up.

[BriComp]

I tried the OP's program with both T4.0 and T4.1, and as soon as it gets loaded the Teensy crashes and does 9 blinks, which means...



So, I tried several of the Snooze Example programs, and they all have the same effect on both T4.0 and T4.1

I'm using Arduino 1.8.19 and TD 1.58b3

See a needed correction to the Snooze Library here.

[ColdFire]

I tried with the full source code of the example, but with the same result.

[joepasquariello]

See a needed correction to the Snooze Library here.

With that fix applied, the OP's program seems to work as intended. I'm not measuring current, but the LED does stop blinking for the period specified in the SnoozeTimer.

[BriComp]

I tried with the full source code of the example, but with the same result.

This post might help you.
See post #16 onwards.

[BriComp]

The Snooze wake up times are rather long for the T4.0. See here.

[ColdFire]

I implemented this correction but the power consumption does not go down.

[ColdFire]

Anyway, it's not very important. I will just use a different board for my project.

Thank you all for your help.

Karl