speciale thx voormijn referentie:http://forum.Arduino.CC/index.php?topic=164112.0 https://blog.adafruit.com/2013/05/02/ardutester-a... http://forum.Arduino.CC/index.php?topic=164112.0 http://nicuflorica.blogspot.co.id/2015/04/ardutes...Frot bovenstaa