Create code.py

Author: firepixie

Head_in_a_Jar/code.py

@@ -0,0 +1,92 @@
+"""
+Circuit Playground Express shake trigger.
+
+Reads accelerometer magnitude and, when it exceeds SHAKE_THRESHOLD,
+pulses pin A1 HIGH for TRIGGER_DURATION seconds, then enforces a cooldown.
+
+Also sets a fixed NeoPixel pattern at startup.
+"""
+
+import math
+import time
+
+import board
+import digitalio
+from adafruit_circuitplayground.express import cpx
+
+SHAKE_THRESHOLD = 11.0
+TRIGGER_DURATION = 3.0  # seconds
+COOLDOWN = 1.0  # seconds to wait after trigger
+LOOP_DELAY = 0.01  # seconds
+
+
+def setup_a1_output() -> digitalio.DigitalInOut:
+    """Configure A1 as a digital output, default LOW."""
+    a1_output = digitalio.DigitalInOut(board.A1)
+    a1_output.direction = digitalio.Direction.OUTPUT
+    a1_output.value = False
+    return a1_output
+
+
+def set_pixel_pattern() -> None:
+    """Set the NeoPixel ring to a red/green pattern."""
+    red = (255, 0, 0)
+    green = (0, 255, 0)
+
+    pattern = (
+        red, red, red,        # 0-2
+        green, green,         # 3-4
+        red, red, red,        # 5-7
+        green, green,         # 8-9
+    )
+
+    cpx.pixels.auto_write = False
+    # Adjust to taste; helps battery + brightness.
+    cpx.pixels.brightness = 0.2
+
+    for index, color in enumerate(pattern):
+        cpx.pixels[index] = color
+
+    cpx.pixels.show()
+
+
+def acceleration_magnitude() -> float:
+    """Return the magnitude of the CPX acceleration vector."""
+    accel_x, accel_y, accel_z = cpx.acceleration
+    return math.sqrt((accel_x ** 2) + (accel_y ** 2) + (accel_z ** 2))
+
+
+def pulse(output: digitalio.DigitalInOut, duration_s: float) -> None:
+    """Set output HIGH for duration_s seconds, then LOW."""
+    output.value = True
+    time.sleep(duration_s)
+    output.value = False
+
+
+def main() -> None:
+    """Main loop."""
+    a1_pin = setup_a1_output()
+    set_pixel_pattern()
+
+    while True:
+        magnitude = acceleration_magnitude()
+
+        print(
+            f"Magnitude: {magnitude:.2f} | "
+            f"Threshold: {SHAKE_THRESHOLD:.2f} | "
+            f"A1 value: {a1_pin.value}"
+        )
+
+        if magnitude > SHAKE_THRESHOLD:
+            print(">>> SHAKE DETECTED! Pulsing A1 HIGH")
+            a1_pin.value = True
+            print(f"A1 is now: {a1_pin.value}")
+            time.sleep(TRIGGER_DURATION)
+            a1_pin.value = False
+            print(f"A1 is now: {a1_pin.value}")
+            time.sleep(COOLDOWN)
+
+        time.sleep(LOOP_DELAY)
+
+
+main()