Merge pull request #2797 from makermelissa/main

Rewrote Wearable Time Lapse Camera script in python

Author: makermelissa

Wearable_Time_Lapse_Camera/timelapse.py

@@ -0,0 +1,74 @@
+# SPDX-FileCopyrightText: 2024 Melissa leBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+#!/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}" # pylint: disable=line-too-long
+# COMMAND = "raspistill -n -w {width -h {height} -q {quality} -th none -t 250 -o {outfile}"
+
+def main():
+    prevtime = 0  # Time of last capture (0 = do 1st image immediately)
+    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()