# Time Lapse Photos (Credit nedhorning) # # This example shows off how to take time lapse photos using your OpenMV # Cam and using the RTC module along with a timer interrupt to achieve # very low power operation. # # Note that if the USB is still plugged in when the camera is taking # pictures it will run the bootloader each time. Please power the camera # from something other than USB to not have the bootloader run. import machine import sensor import os # Create and init RTC object. This will allow us to set the current time for # the RTC and let us set an interrupt to wake up later on. rtc = machine.RTC() newFile = False try: os.stat("time.txt") except OSError: # If the log file doesn't exist then set the RTC and set newFile to True # datetime format: year, month, day, weekday (Monday=1, Sunday=7), # hours (24 hour clock), minutes, seconds, subseconds (counts down from 255 to 0) rtc.datetime((2018, 3, 9, 5, 13, 0, 0, 0)) newFile = True # Extract the date and time from the RTC object. dateTime = rtc.datetime() year = str(dateTime[0]) month = "%02d" % dateTime[1] day = "%02d" % dateTime[2] hour = "%02d" % dateTime[4] minute = "%02d" % dateTime[5] second = "%02d" % dateTime[6] subSecond = str(dateTime[7]) # Image file name based on RTC newName = "I" + year + month + day + hour + minute + second # Enable RTC interrupts every 10 seconds, camera will RESET after wakeup from deepsleep Mode. rtc.wakeup(10000) BLUE_LED_PIN = 3 sensor.reset() # Initialize the camera sensor. sensor.set_pixformat(sensor.GRAYSCALE) sensor.set_framesize(sensor.VGA) sensor.skip_frames(time=1000) # Let new settings take affect. led = machine.LED("LED_BLUE") if newFile: # If log file does not exist then create it. with open("time.txt", "a") as timeFile: # Write text file to keep track of date, time and image number. timeFile.write("name, year, month, day, hours, minutes, seconds, subseconds\n") timeFile.write( f"{newName},{year},{month},{day},{hour},{minute},{second},{subSecond}\n" ) else: with open("time.txt", "a") as timeFile: # Append to date, time and image number to text file. timeFile.write( f"{newName},{year},{month},{day},{hour},{minute},{second},{subSecond}\n" ) if not "images" in os.listdir(): os.mkdir("images") # Make a temp directory # Take photo and save to SD card led.on() img = sensor.snapshot() img.save("images/" + newName, quality=90) led.off() # Enter Deepsleep Mode (i.e. the OpenMV Cam effectively turns itself off except for the RTC). machine.deepsleep()