import select
import sys
import time
import machine

# Create an instance of a polling object 
poll_obj = select.poll()
# Register sys.stdin (standard input) for monitoring read events with priority 1
poll_obj.register(sys.stdin,1)
# Pin object for controlling onboard LED
led=machine.Pin(25,machine.Pin.OUT)

while True:
    # Check if there is any data available on sys.stdin without blocking
    if poll_obj.poll(0):
        # Read one character from sys.stdin
        ch = sys.stdin.read(1)
        # Check if the character read is 't'
        if ch=='t':
            # Toggle the state of the LED
            led.value(not led.value())
            # Print a message indicating that the LED has been toggled
            print ("LED toggled" )
    # Small delay to avoid high CPU usage in the loop
    time.sleep(0.1)