from machine import Pin, I2C, PWM
from ssd1306 import SSD1306_I2C
from time import sleep, ticks_ms, ticks_diff
BUTTON_PINS = [5,4,14,12]
servo = PWM(Pin(18), freq=50, duty=77) # 77 is the duty cycle for 0 degrees
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=100000)
oled = SSD1306_I2C(128, 64, i2c)
red_led = Pin(16, Pin.OUT)
green_led = Pin(17, Pin.OUT)
buzzer = PWM(Pin(13), freq=1000, duty=0) # Start with the buzzer off
def move_servo(angle):
duty_cycle = int(((angle / -180) * 77) + 77)
servo.duty(duty_cycle)
sleep(0.5) # Give time for the servo to move
def control_outputs(status):
if status == "running":
red_led.on()
green_led.off()
buzzer.duty(0)
elif status == "complete":
red_led.off()
green_led.on()
buzzer.duty(512)
def display_message(message):
oled.fill(1)#Make OLED White background
oled.text(message, 10, 30, 0)
oled.show()
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 motor is running
move_servo(angle)
sleep(0.5) # Debounce delay
control_outputs("complete") # Turn on the green LED and turn on the buzzer indicating motor is complete
display_message("")
if not button_pressed:
buzzer.duty(0) # Turn off the buzzer if no button is pressed
sleep(0.1)