Obviously this wont be as idiot-proof as digitalWrite() is, but we think you can handle it. Our second tip is for a set of OLED displays from 4dsystems sold as Arduino Shields.

Used here to set a pin number: const int ledPin = LED_BUILTIN; // the number of the LED pin // Variables will change: int ledState = LOW; // ledState used to set the LED // Generally, you should use ...