from mfrc522 import SimpleMFRC522
import time
from machine import Pin

# Define GPIO pins for the LEDs
RED = Pin(2, Pin.OUT)
AMBER = Pin(6, Pin.OUT)
GREEN = Pin(10, Pin.OUT)

# Put them in an array
lights = [RED, AMBER, GREEN]

# Set the GPIO pins being used
reader = SimpleMFRC522(spi_id=0,sck=18,miso=16,mosi=19,cs=17,rst=9)

# Function to turn off all LEDs
def all_off():
    for light in lights:
        light.off()

# Read the RFID card/tag/sticker
def read():
    print("Reading...Please place the card...")  # print a message telling the user to tap the card.
    id, text = reader.read()   # read in two fields from the tag, id and text.
    print("ID: %s\nText: %s" % (id,text))   # print the result in Thonny
#   return id, text
    return text.strip()  # this returns the contents of 'text' to the calling code, but strips off any crap like spaces.
                         # Even if the tag is short (red) you still get 16 chars back from the read, so we need to strip of what is not required.


# Call function 'all_off' to turn off all LEDs
all_off()

# Start a loop (forever)
while True:
    tag = read() #c all the function def read() and store the result in the varable tag
    print ("the scanned colour is =", tag)  #print the contents of the variable tag
    
    # Ched the read tag colour, turn off all LEDs then turn on the corresponding one. If no tags match, nothing happens.
    if tag == "RED":
        all_off()
        RED.on()
    elif tag == "AMBER":
        all_off()
        AMBER.on()
    elif tag == "GREEN":
        all_off()
        GREEN.on()
      
    time.sleep(1) # The delay is to stop the tag being read multiple times per second.