I have made a script (below) which which controls a LED through two functions, blink_fast() and blink_slow(). My goal is to control the "mode" of the LED by using a physical push-button wired to GPIO.
The script includes an event detection and callback, per this guide, and the button does work to trigger the event, and the callback will correctly print to console when the event is detected. The problem is that the event does not interrupt the current "cycle" of blinking. For example, if the button is pressed shortly after the blink_slow function, the program will finish out its 6 second blink cycle before changing to the blink_fast mode. I would like the device to switch immediately when the button is pressed.
I have tried placing the mode_switch function inside the callback, but that did not help.
How can I get the event to immediately interrupt the current blink cycle before starting the new one?
Thanks in advance!
import RPi.GPIO as GPIO from time import sleep BUTTON_GPIO = 16 blueLED = 17 state_flag = False def button_pressed_callback(channel): global state_flag print("button press detected") state_flag = (not state_flag) def blink_slow(): GPIO.output(blueLED, GPIO.HIGH) sleep(3) GPIO.output(blueLED, GPIO.LOW) sleep(3) def blink_fast(): GPIO.output(blueLED, GPIO.HIGH) sleep(.2) GPIO.output(blueLED, GPIO.LOW) sleep(.2) def mode_switch(): while state_flag == True: blink_fast() while state_flag == False: blink_slow() GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) GPIO.setup(blueLED,GPIO.OUT) GPIO.setup(BUTTON_GPIO, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.add_event_detect(BUTTON_GPIO, GPIO.FALLING, callback=button_pressed_callback, bouncetime=300) while True: mode_switch()