Wrote Wearable Time Lapse Camera script in python

Author: makermelissa

Wearable_Time_Lapse_Camera/timelapse.py

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+#!/usr/bin/env python3
+
+import os
+import re
+import time
+import board
+import digitalio
+
+# Timelapse script, because timelapse options in raspistill don't power
+# down the camera between captures. Script also provides a camera busy LED
+# (v2 cameras don't include one) and a system halt button.
+# 'gpio' command requires WiringPi: sudo apt-get install wiringpi
+# Limitations: if DEST is FAT32 filesystem, max of 65535 files in directory;
+# if DEST is ext4 filesystem, may have performance issues above 10K files.
+# For intervals <2 sec, better just to use raspistill's timelapse feature.
+
+# Configurable stuff...
+INTERVAL = 15            # Time between captures, in seconds
+WIDTH = 1280             # Image width in pixels
+HEIGHT = 720             # Image height in pixels
+QUALITY = 51             # JPEG image quality (0-100)
+DEST = "/home/pi/timelapse" # Destination directory (MUST NOT CONTAIN NUMBERS)
+PREFIX = "img"           # Image prefix (MUST NOT CONTAIN NUMBERS)
+HALT_PIN = board.D21         # Halt button GPIO pin (other end to GND)
+LED_PIN = board.D5           # Status LED pin (v2 Pi cam lacks built-in LED)
+COMMAND = "libcamera-still -n --width {width} --height {height} -q {quality} --thumb none -t 250 -o {outfile}"
+#COMMAND = "raspistill -n -w {width -h {height} -q {quality} -th none -t 250 -o {outfile}"
+prevtime = 0             # Time of last capture (0 = do 1st image immediately)
+
+def main():
+    global prevtime
+    halt = digitalio.DigitalInOut(HALT_PIN)
+    halt.switch_to_input(pull=digitalio.Pull.UP)
+    led = digitalio.DigitalInOut(LED_PIN)
+    led.switch_to_output()
+
+	# Create destination directory (if not present)
+    os.makedirs(DEST, exist_ok=True)
+
+    # Find index of last image (if any) in directory, start at this + 1
+    files = os.listdir(DEST)
+    numbers = [int(re.search(r'\d+', f).group()) for f in files if f.startswith(PREFIX) and re.search(r'\d+', f)]
+    numbers.sort()
+    frame = numbers[-1] + 1 if numbers else 1
+    currenttime = time.monotonic()
+
+    while True:
+        while time.monotonic() < prevtime + INTERVAL: # Until next image capture time
+            currenttime = time.monotonic()
+            # Check for halt button -- hold >= 2 sec
+            while not halt.value:
+                if time.monotonic() >= currenttime + 2:
+                    led.value = True
+                    os.system('shutdown -h now')
+        outfile = f"{DEST}/{PREFIX}{frame:05}.jpg"
+        # echo $OUTFILE
+        led.value = True
+        os.system(COMMAND.format(width=WIDTH, height=HEIGHT, quality=QUALITY, outfile=outfile))
+        led.value = False
+        frame += 1 # Increment image counter
+        prevtime = currenttime # Save image cap time
+
+
+if __name__ == "__main__":
+    main()