CASE FOR RASPBERRY PI PICO W 2

built this case to wrap the conveyor into a nice clean box.   

here is the print file and my script for the pi.  

if requested i can provide the mount for the reed switch as well. 

*******************************************pico pi script *****************************************************************

from machine import ADC, Pin
from time import ticks_ms, sleep

# === INPUT PINS ===
reed_sensor = ADC(26)              # GP26 - Reed switch
ir_sensor = Pin(0, Pin.IN)         # GP0 - IR fallback

# === OUTPUTS: Stepper via ULN2003 (GP2–GP5)
IN1 = Pin(2, Pin.OUT)
IN2 = Pin(3, Pin.OUT)
IN3 = Pin(4, Pin.OUT)
IN4 = Pin(5, Pin.OUT)

# === LED Indicators
blue_led = Pin(6, Pin.OUT)         # GP6 - Trigger blink
yellow_led = Pin(7, Pin.OUT)       # GP7 - Motor active
red_led = Pin(8, Pin.OUT)          # GP8 - Wait countdown
green_led = Pin(15, Pin.OUT)       # GP15 - Heartbeat
heartbeat_led = Pin("LED", Pin.OUT)

# === Timing + Thresholds
heartbeat_timer = 0
heartbeat_interval = 2000
motor_running = False
motion_start = 0
motion_confirmed = False
motion_hold_time = 1000  # debounce

LOW_THRESHOLD = 0.5
HIGH_THRESHOLD = 1.5

# === Stepper Sequence
sequence = [
   [1,0,0,1],
   [1,0,0,0],
   [1,1,0,0],
   [0,1,0,0],
   [0,1,1,0],
   [0,0,1,0],
   [0,0,1,1],
   [0,0,0,1]
]

def set_step(step):
   IN1.value(step[0])
   IN2.value(step[1])
   IN3.value(step[2])
   IN4.value(step[3])

def spin_motor(duration_ms=30000, delay=1):
   global motor_running
   print("⏳ Wait timer started — 10 seconds")

   for _ in range(10):
       red_led.high()
       sleep(0.5)
       red_led.low()
       sleep(0.5)

   print("🔁 Stepper motor spinning for 30 seconds")
   motor_running = True
   yellow_led.high()
   start_time = ticks_ms()

   while ticks_ms() - start_time < duration_ms:
       for step in sequence:
           set_step(step)
           sleep(delay / 1000)

   stop_motor()

def stop_motor():
   global motor_running
   set_step([0,0,0,0])
   yellow_led.low()
   motor_running = False
   print("⛔ Motor stopped")

def blink_blue(times=3, delay=0.2):
   for _ in range(times):
       blue_led.high()
       sleep(delay)
       blue_led.low()
       sleep(delay)

def heartbeat():
   global heartbeat_timer
   now = ticks_ms()
   if now - heartbeat_timer > heartbeat_interval:
       heartbeat_led.toggle()
       green_led.toggle()
       heartbeat_timer = now

# === MAIN LOOP ===
print("🚀 Conveyor controller ready")
while True:
   heartbeat()

   voltage = (reed_sensor.read_u16() / 65535) * 3.3

   if voltage < LOW_THRESHOLD and not motor_running:
       print(f"🧲 Magnet trigger: {voltage:.2f}V")
       blink_blue(2)
       spin_motor()

   elif int(not ir_sensor.value()) == 1 and not motor_running:
       if motion_start == 0:
           motion_start = ticks_ms()
       elif ticks_ms() - motion_start > motion_hold_time and not motion_confirmed:
           print("👁️ IR fallback trigger")
           blink_blue(3)
           spin_motor()
           motion_confirmed = True
   else:
       motion_start = 0
       motion_confirmed = False

   sleep(0.01)

**********************************************wiring setup*******************************************************************

GP2    Motor driver IN1-white
GP3    Motor driver IN2-tan
GP4    motor driver IN3-orange 
GP5    motor driver IN4-yellow
GP6    green  LED — blinks when magnet detected
GP7    Yellow LED — ON while motor is active
GP8    Red LED — wait to start motor spin delay GP15    blue  LED — heartbeat (pairs with onboard)
GP26    Reed sensor (ADC input for magnet trigger)
LED    Onboard LED — heartbeat toggle
3.3V    Powers pull-up resistor for reed sensor
GND    Common ground for all components