Datasheet

analogRead()
You can read an analog voltage from digital #2 (called Analog 1), digital #3 (called Analog 3) and
digital #4 (called Analog 2)
/*
Button
Turns on an LED when a switch connected from #0 to ground is pressed
This example code is in the public domain.
To upload to your Gemma or Trinket:
1) Select the proper board from the Tools->Board Menu
2) Select USBtinyISP from the Tools->Programmer
3) Plug in the Gemma/Trinket, make sure you see the green LED lit
4) For windows, install the USBtiny drivers
5) Press the button on the Gemma/Trinket - verify you see
the red LED pulse. This means it is ready to receive data
6) Click the upload button above within 10 seconds
*/
#define SWITCH 0
#define LED 1
// the setup routine runs once when you press reset:
void setup() {
// initialize the LED pin as an output.
pinMode(LED, OUTPUT);
// initialize the SWITCH pin as an input.
pinMode(SWITCH, INPUT);
// ...with a pullup
digitalWrite(SWITCH, HIGH);
}
// the loop routine runs over and over again forever:
void loop() {
if (! digitalRead(SWITCH)) { // if the button is pressed
digitalWrite(LED, HIGH); // light up the LED
} else {
digitalWrite(LED, LOW); // otherwise, turn it off
}
}
© Adafruit
Industries
https://learn.adafruit.com/introducing-trinket Page 41 of 65