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Despite my experience, I still needed a mini crash course simply because our two children are very different, and I wanted as much information as possible so that his son could feel comfortable and secure around me as we all got to know one another.
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We’ve used all the same building blocks we developed in parts 1 and 2, including button debouncing. GPIO (currently 0.5.5) is to flash a new SD card with the latest NOOBS or Raspbian.

If you didn’t do it for the first or second examples, you will quite likely need to update your RPi. This will give you a clean start with the latest version of RPi. I’ve put most of the explanations in the code, so that if you use it, you will still have them. /usr/bin/env python2.7 # script by Alex Eames # Pi.tv/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3 import RPi. BCM) # GPIO 23 & 17 set up as inputs, pulled up to avoid false detection. PUD_UP) # GPIO 24 set up as an input, pulled down, connected to 3V3 on button press GPIO.setup(24, GPIO. PUD_DOWN) # now we'll define two threaded callback functions # these will run in another thread when our events are detected def my_callback(channel): print "falling edge detected on 17" def my_callback2(channel): print "falling edge detected on 23" print "Make sure you have a button connected so that when pressed" print "it will connect GPIO port 23 (pin 16) to GND (pin 6)\n" print "You will also need a second button connected so that when pressed" print "it will connect GPIO port 24 (pin 18) to 3V3 (pin 1)\n" print "You will also need a third button connected so that when pressed" print "it will connect GPIO port 17 (pin 11) to GND (pin 14)" raw_input("Press Enter when ready\n") # when a falling edge is detected on port 17, regardless of whatever # else is happening in the program, the function my_callback will be run GPIO.add_event_detect(17, GPIO.

At the outer level, the toplevel window was the master, and the content frame was the slave.At the inner level, the content frame was the master, with each of the other widgets being slaves.So the same widget can be both a master and a slave.We’ll add another button and another threaded callback function the same as the first one (but on a different GPIO port).This is just to show that you can do multiple threaded callbacks in one program. (Well actually the number of GPIO ports is probably the limit.) We’re just building on what we did before and this is exactly how programs are made.It will figure out what widget the event applies to (did the user click on this button? Often though you want your program to handle particular events, for example doing something when a button is pushed.