# Example for micropython.org device, gpio mode
# Connections:
# Pin # | HX711
# ------|-----------
# 12    | data_pin
# 13    | clock_pin
#
from gpio_lcd import GpioLcd
from hx711_gpio import HX711
from machine import Pin
import time

pin_OUT = Pin(26, Pin.IN, pull=Pin.PULL_DOWN)
pin_SCK = Pin(27, Pin.OUT)
pin_yellow = Pin(7, Pin.IN, Pin.PULL_UP) #latch switch side 1
pin_white = Pin(4, Pin.IN, Pin.PULL_UP) #latch switch side

lcd = GpioLcd(rs_pin=Pin(16),
              enable_pin=Pin(17),
              d4_pin=Pin(18),
              d5_pin=Pin(19),
              d6_pin=Pin(20),
              d7_pin=Pin(21),
              num_lines=2, num_columns=16)

hx711 = HX711(pin_SCK, pin_OUT)

hx711.tare(10)

#start serial
print("switch_y, switch_w, raw value")

#loop load cell value read and display
while True:
           
    #value = hx711.read()
    #print(value)
    raw_value = hx711.get_value()
    
    #Print na and -99 when neither 5kg or 50kg load cell is selected
    if pin_yellow.value() == True and pin_white.value() == True:
        weight_value_g = -99
        raw_value = -99
        cell_type = "NA"
        
    #If 5kg load cell is selected, use 5kg calibration coefficient
    elif pin_yellow.value() == True and pin_white.value() == False:
        #weight_value_g = round((raw_value+2319.4)/418.06, 1)
        weight_value_g = round(raw_value/417, 1)
        cell_type = "5kg"
        
    #If 50kg load cell is selected, use 50kg calibration coefficient
    elif pin_yellow.value() == False and pin_white.value() == True:
        #weight_value_g = round((raw_value+567.93)/96.2, 1)
        weight_value_g = round(raw_value/97, 1)
        cell_type = "50kg"
        
    print(pin_yellow.value(), " , ", pin_white.value(), " , ", raw_value)
    #display on lcd
    lcd.move_to(0,0)
    lcd.clear()
    lcd.putstr("(" + cell_type + f")raw: {round(raw_value, 1)}")
    lcd.move_to(0,1)
    lcd.putstr(f"weight: {weight_value_g} g")
    time.sleep(0.5) #pause for lcd refresh