import utime
from machine import I2C, Pin, ADC
import onewire, ds18x20
from rotary import Rotary
import utime as time
from lcd_api import LcdApi
from pico_i2c_lcd import I2cLcd

pico_temp_threshold = 40  # Set the Pico temperature threshold in Celsius
rotary = Rotary(0,1,2)
SW = Pin(2, Pin.IN, Pin.PULL_UP)
set_temp = 75
current_temp= 0
F_current_temp= 0
ssr_pin = Pin(20, Pin.OUT)
I2C_ADDR     = 39
I2C_NUM_ROWS = 2
I2C_NUM_COLS = 16

sensor_data = ADC(4)
conversion_factor = 3.3/(65535)
V_REF = 3.3  # Reference voltage in volts

i2c = I2C(1, sda=machine.Pin(6), scl=machine.Pin(7), freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, I2C_NUM_ROWS, I2C_NUM_COLS)
oneWireBus = ds18x20.DS18X20(onewire.OneWire(Pin(15)))
sensors = oneWireBus.scan()
if (len(sensors)==0):
    print('DS18x20 device not found')
    
def display(): 
    #lcd.clear()
    lcd.move_to(0,0)
    lcd.putstr("Current Tem:")
    lcd.move_to(12,0)
    lcd.putstr("{0:.0f}F".format(F_current_temp))
    lcd.move_to(0,1)
    lcd.putstr("Set Tem:")
    lcd.move_to(10,1)
    lcd.putstr("{0:.0f}F".format(set_temp))

def ds18x20():
    global current_temp
    global F_current_temp
    oneWireBus.convert_temp()
    time.sleep_ms(750)
    for s in sensors:
        current_temp = oneWireBus.read_temp(s)
        F_current_temp = (current_temp * 1.8) + 32
        print(F_current_temp)
    time.sleep_ms(500)
    
def temp_camp():
    global set_temp
    pico_temp = read_pico_temperature() 
    # Check if temperature reading from Pico is valid
    if pico_temp is None:
        print("Unable to read Pico temperature.")
        return
    if pico_temp >= pico_temp_threshold:  
        ssr_pin.value(0) 
        print("Pico temperature above threshold. SSR turned off.")
        return  # Exit

    # If Pico's temperature is below the threshold, proceed to check the set temperature
    if F_current_temp <= set_temp:
        print("SSR on")
        ssr_pin.value(1)
    elif F_current_temp >= set_temp + 1:
        print("SSR off")
        ssr_pin.value(0)
        
def read_pico_temperature():
    sensor_voltage = sensor_data.read_u16() * conversion_factor
    # Calculate temperature in degrees Celsius if the reading is within a reasonable range
    if 0 <= sensor_voltage <= V_REF:
        T = 27 - (sensor_voltage - 0.706)/0.001721
        format_temp = "{:.2f}".format(T)
        print(format_temp)
        return float(format_temp)
    else:
        return None
 
    
def rotary_changed(change):
    global set_temp
    if change == Rotary.ROT_CW:
        set_temp = set_temp - 1
        if set_temp <=60:
            set_temp= 60   
        print(set_temp)
    elif change == Rotary.ROT_CCW:
        set_temp = set_temp + 1
        if set_temp >=120:
            set_temp= 120   
            print(set_temp)
        print(set_temp)
     
rotary.add_handler(rotary_changed)
    
while True:    
    ds18x20()
    display()
    temp_camp()
    utime.sleep(.1)