Few Question about using sleep function

[GookgikPagornsirikul]

Hi everyone

1. Can sleep mode System.sleep(wakeUpPin, edgeTriggerMode, seconds) work without time?
   (I want to wake the electron up everytime it senses the acceleration which greater than the threshold)

2. About the WKP, I don’t understand how this work? I think that the system will wake up every time it senses something from sensor(in my case it accelerometer) , Does threshold have the effect on WKP?

3. How setupLowpowermode work?, if I set the electron to this low power mode, how can I change the mode without using System.sleep(wakeUpPin, edgeTriggerMode, seconds)?

4.this is about GPS. Does gpsOn(); mean turn off gps and gpsOff(); means turn on ?

Thank you

[Moors7]

@GookgikPagornsirikul

Can sleep mode System.sleep(wakeUpPin, edgeTriggerMode, seconds) work without time?(I want to wake the electron up everytime it senses the acceleration which greater than the threshold)

As per the docs:

In all cases, if the wake up time seconds is omitted or 0, the application will keep sleeping until the wakeUpPin triggers (if specified) or the user hits the RESET button.

@GookgikPagornsirikul

About the WKP, I don't understand how this work? I think that the system will wake up every time it senses something from sensor(in my case it accelerometer) , Does threshold have the effect on WKP?

A RISING, FALLING, or CHANGE-ingslope will be detected. Thresholds will not matter and should be checked afterwards. Alternatively, configure your peripheral to send a signal only when its pre-configured threshold is reached.

@GookgikPagornsirikul

How setupLowpowermode work?, if I set the electron to this low power mode, how can I change the mode without using System.sleep(wakeUpPin, edgeTriggerMode, seconds)?

Not sure what you're referring to, have you got a link?

@GookgikPagornsirikul

Does gps On(); mean turn off gps and gps Off(); means turn on ?

if you look at the names, you can probably guess what they're supposed to do. If not, a link to whatever it is you're referring to would be great.

[peekay123]

@Moors7

A RISING, FALLING, or CHANGE-ing slope will be detected. Thresholds will not matter and should be checked afterwards. Alternatively, configure your peripheral to send a signal only when its pre-configured threshold is reached.

@Moors7, the WKP pin will ONLY wake the device from deep sleep using a RISING edge. This is as defined in the STM32F205 specs. If the WKP pin is use for waking for non deep sleep, then it behaves as you described.

[GookgikPagornsirikul]

Well , because of the description, I’m confused. And, in the library it said that gps Off() means HIGH which I understand that high mean let that pin work. I’m still confused.

[GookgikPagornsirikul]

@Moors7

Not sure what you're referring to, have you got a link?

I adapt from wake on me in the assettracker library. It use low power mode in reset state.

particle-iot/ElectronAssetTracker/blob/master/examples/3_WakeOnMove/3_WakeOnMove.ino

[GookgikPagornsirikul]

To , @peekay123 and @Moors7

By the way, thank you for your help.

[ScruffR]

@GookgikPagornsirikul

in the library it said that gps Off() means HIGH which I understand that high mean let that pin work. I'm still confused.

HIGH does not mean active. A lot of devices have "active LOW" pins.
e.g. the SlaveSelect pins on SPI devices are active LOW, meaning the respective slave is enabled/selected by pulling the pin LOW.

[GookgikPagornsirikul]

Thank you @ScruffR