Gabriele Pöppinghaus thinks this is interesting: led = LED(4) From Chapter 16: Taking Control of Your Pi’s Circuitry from Raspberry Pi For Dummies, 3rd Edition by Mike Cook, Sean McManus Publisher: John Wiley & Sons Released: September 2017 Note something is missing here Share this highlight http://www.safaribooksonline.com/a/raspberry-pi-for/9859388/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Learn about Safari for Business Have an account? Sign in. Minimise Unlock the rest of Raspberry Pi For Dummies, 3rd Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.