main-code-for-receiver

# Code by Roselyn rosa-com on GitHub
# Ideally receivedVal would just be declared but it could cause an error as lower down in the code, it needs a value but doesn't know it is sent from micro:bit 1
receivedVal = 0
basic.show_icon(IconNames.HAPPY)
radio.set_group(56)

def on_received_number(receivedNumber):
    global receivedVal

		# Received value links to the gesture made by the other micro:bit
    receivedVal = receivedNumber
    # Switch statement could be used as this elif has only numerical values
    # The options for turning the car is a 'pivot' turn or a gradual turn. Here I have shown a gradual turn where the car continuously goes forward while turning instead of going on a pivot
    if receivedVal == 1:
        basic.show_arrow(ArrowNames.NORTH)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR1,
            kitronik_motor_driver.MotorDirection.FORWARD,
            # Formatted like this for easier viewing of the values
            50)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR2,
            kitronik_motor_driver.MotorDirection.FORWARD,
            50)
    elif receivedVal == 2:
        basic.show_arrow(ArrowNames.SOUTH)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR1,
            kitronik_motor_driver.MotorDirection.REVERSE,
            50)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR2,
            kitronik_motor_driver.MotorDirection.FORWARD,
            50)
    elif receivedVal == 3:
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR1,
            kitronik_motor_driver.MotorDirection.FORWARD,
            50)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR2,
            kitronik_motor_driver.MotorDirection.FORWARD,
            20)
        basic.show_arrow(ArrowNames.WEST)
    elif receivedVal == 4:
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR1,
            kitronik_motor_driver.MotorDirection.FORWARD,
            20)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR2,
            kitronik_motor_driver.MotorDirection.FORWARD,
            50)
        basic.show_arrow(ArrowNames.EAST)
    # Stopping the car. 'break' could be used to break out of the loop but in this case, you are temporarily stopping the car and it will continue with gestures
		# A pause could be put in place if needed using 'basic.pause(value)'. Note: they use milliseconds.
		elif recievedVal == 5:
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR1,
            kitronik_motor_driver.MotorDirection.FORWARD,
            0)
        kitronik_motor_driver.motor_on(kitronik_motor_driver.Motors.MOTOR1,
            kitronik_motor_driver.MotorDirection.FORWARD,
            0)
    else:
        # A default error message or an indicator if a a gesture isn't detected (it's unlikely this will be shown as gestures are a constant). 
        basic.show_leds("""
            . . . . .
            . # . # .
            . . . . .
            . # # # .
            # . . . #
            """)

# The receiving is constant, it's also an indefinite loop. However, condition 5 allows for pressing the 'a' button to stop both motors essentially stopping it but still allowing to continuing.
radio.on_received_number(on_received_number)