After completing the example code for Taffic Lights Controler (chapt 5) the book states on page 66, "Let the traffic lights loop through their cycle a few more times, then press the button again to trigger another crossing." Once I press the button, when the buzzer sounds I get an errorAfter this the button isn't recognised again until I restart Thonny and unplug and replug in the pico.
Here's the code I have loaded onto the Pico. Is there any error in this code? I've checked it against the example code over and over and I don't see anything out of place. Thanks for your help in advance.
Code:
MPY: soft rebootUnhandled exception in thread started by <function button_reader_thread at 0x200076d0>Traceback (most recent call last): File "<stdin>", line 17, in button_reader_threadNameError: name 'button' isn't definedHere's the code I have loaded onto the Pico. Is there any error in this code? I've checked it against the example code over and over and I don't see anything out of place. Thanks for your help in advance.
Code:
import machineimport utimeimport _threadled_red = machine.Pin(15, machine.Pin.OUT)led_amber = machine.Pin(14, machine.Pin.OUT)led_green = machine.Pin(13, machine.Pin.OUT)button = machine.Pin(16, machine.Pin.IN, machine.Pin.PULL_DOWN)buzzer = machine.Pin(12, machine.Pin.OUT)global button_pressedbutton_pressed = Falsedef button_reader_thread(): global button_pressed while True: if button.value() == 1: button_pressed = True _thread.start_new_thread(button_reader_thread, ())while True: if button_pressed == True: led_red.value(1) for i in range(10): buzzer.value(1) utime.sleep(0.2) buzzer.value(0) utime.sleep(0.2) global button_pressed button_pressed = False led_red.value(1) utime.sleep(5) led_amber.value(1) utime.sleep(2) led_red.value(0) led_amber.value(0) led_green.value(1) utime.sleep(5) led_green.value(0) led_amber.value(1) utime.sleep(5) led_amber.value(0)Statistics: Posted by Rueful-Pi — Sat May 04, 2024 10:05 pm — Replies 1 — Views 44
