#This is a system for medical syringe pump

print("By Afif for IOT BEB 34303:")

from ssd1306 import SSD1306_I2C
from machine import Pin, I2C, PWM
from time import sleep, ticks_ms, ticks_diff

#Declare pin connection

SERVO_PIN = 18
BUTTON_PINS = [5, 4, 14, 12]
I2C_SCL_PIN = 22
I2C_SDA_PIN = 21
RED_LED_PIN = 16
GREEN_LED_PIN = 17
BUZZER_PIN = 13 

#initialize components
servo = PWM(Pin(SERVO_PIN), freq=50, duty=77)
i2c = I2C(0, scl=Pin(I2C_SCL_PIN), sda=Pin(I2C_SDA_PIN), freq=100000)
oled = SSD1306_I2C(128, 64, i2c)
red_led = Pin(RED_LED_PIN, Pin.OUT)
green_led = Pin(GREEN_LED_PIN, Pin.OUT)
buzzer = PWM(Pin(BUZZER_PIN), freq=1000, duty=0)

#functtion to move the servo to a specific angle
def move_servo(angle):
    duty_cycle = int(((angle / -180)*77)+77)
    servo.duty(duty_cycle)
    sleep(0.5)

def control_output(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)

#function to display a message on the OLED
def display_message(message):
    oled.fill(1)#make the OLED background white

#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:
                engle = 90
                message = "15ml Dispensed"
            elif i == 3:
                angle = 120
                message = "20ml Dispensed"

            volume = (i+1)*5
            display_message(message)
            control_outputs("running")
            move_servo(angle)
            sleep(0.5)
            control_outputs("complete")
            display_message("")

    if not button_pressed:
        buzzer.duty(0)

    sleep(0.1)