from machine import Pin, I2C, PWM
import ssd1306
from time import sleep, ticks_ms, ticks_diff
button_pins = [27, 14, 12, 13]
buzzer_pin = 5
servo_pin=18
servo = PWM(Pin(servo_pin), freq=50, duty=77)
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=10000)
oled = ssd1306.SSD1306_I2C(128, 64, i2c)
red_led = Pin(16, Pin.OUT)
green_led = Pin(17, Pin.OUT)
buzzer = PWM(Pin(buzzer_pin), freq=10000, duty=0)
#function to move the servo to spesific angle
def move_servo(angle):
duty_cycle = int(((angle / -180)*77) + 77)
servo.duty(duty_cycle)
sleep(0.5)
#function to control LEDs and buzzer based on motor operation
def control_outputs(status):
if status == "running":
red_led.on()
green_led.off()
buzzer.duty(0) #turn off buzzer when the motor is running
elif status == "complete":
red_led.off()
green_led.on()
buzzer.duty(520) #turn on buzzer when motor is complete
#function to display message on OLED screen
def display_message(message):
oled.fill(1)
oled.text(message, 10, 30, 0)
oled.show()
#main loop
while True:
display_message("Press a button")
button_pressed = False
for i, button_pin in enumerate(button_pins):
button = Pin(button_pin, Pin.IN, Pin.PULL_UP)
if button.value() == 0:
button_pressed = True
if i == 0:
angle = 30
message = "5ml dispensed"
elif i == 1:
angle = 60
message = "10ml dispensed"
elif i == 2:
angle = 90
message = "15ml dispensed"
elif i == 3:
angle = 120
message = "20ml dispensed"
volume = (i+1)*5 #calculate volume based on button press
display_message(message)
control_outputs("running") #turn on the red LED and turn off the buzzer indicating
move_servo(angle)
sleep(0.5) #debounce delay
control_outputs("complete") #turn on led and turn on the buzzer indicating
display_message("")
if not button_pressed:
buzzer.duty(0) #turn off the buzzer if no button pressed
sleep(0.1)