Sleep mode

[iabdalkader]

Hello,

**- I notice that there’s pyb.stop and sensor.sleep. If I only do pyb.stop, then does that leave the camera on with the ability to process images still? If so, using Frame Differencing, can I wake up the hardware from pyb.stop when an object is detected? Or, is the wakeup strictly with an external interrupt or RTC?
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• I could use a sensor to detect when an object is added in the system. If I put the camera to sleep using sensor.sleep(true) in addition to the pyb.stop, when the sensor triggers the external interrupt, will it also wake up the camera or do i need to add sensor.sleep(false) in my callback?**

Thank you,
Nicholas

Hi, the image sensor doesn’t do any image processing on its own, and the camera can’t process images while in sleep or low-power mode. The only way to wake up from sleep/low-power modes is with an interrupt (RTC, I/O, Systick etc…). The sensor.sleep() function just shuts down the sensor to save more power. I would just check once every few frames and then sleep for a while.