Interrupt and write to file

[alexpul]

I'm using a Pytrack and want to set the accelerometer to wake up (interrupt) the board from sleep and then write the current time to a file located on either the flash or SD. I have an example of a basic accelerometer interrupt:

from pytrack import Pytrack
from LIS2HH12 import LIS2HH12

py = Pytrack()

py.setup_int_pin_wake_up(False)
py.setup_int_wake_up(True, True)

acc = LIS2HH12()
acc.enable_activity_interrupt(2000, 200)

and an example of how to write the time to a file on a SD card:

from pytrack import Pytrack
import time
import machine
import pycom
import os
from machine import SD
import os
import uos
​
## Mount SD card
sd = SD() #create SD card object
os.mount(sd, '/sd') #mount object

## Initialize time
rtc = machine.RTC()
rtc.init((2018, 8, 27, 2, 10, 30, 0, 0))

## Write time to file
f = open('/sd/test.txt', 'a') #create file (append mode)
f.write("{}\n".format(rtc.now()))
f.close()

uos.unmount('/sd')

but I don't know how to combine the two actions. Bonus would be to also turn the LED on when an interrupt happens. Any pointers, links or working code would be greatly appreciated!

[Sympatron]

You need to pass a handler to enable_activity_interrupt() like so:

def my_activity_handler(pin_o):
    # your code saving to file here

acc = LIS2HH12()
acc.enable_activity_interrupt(2000, 200, handler=my_activity_handler)

[jcaron]

@sympatron That handler is only for interrupts received while the module is awake.

@alexpul In the first code snippet, you don't actually go to deep sleep. What module do you have (WiPy 2, WiPy 3, LoPy, LoPy 4, FiPy, GPy...)? This will decide whether you should use "native" deep sleep or Pytrack-controller deep sleep.

[alexpul]

@jcaron I have a WiPy 3. What do you recommend using for deep sleep?

And for the handler interrupt, do you know how to integrate it while the device is sleeping?