The Arduino code presented below works equally well on all versions of GEMMA: v1, v2 and M0. But if you have an M0 board, consider using the CircuitPython code on the next page of this guide, no Arduino IDE required!
If this is your first time using GEMMA, work through the Introducing GEMMA or Introducing Gemma M0 guide first; you need to customize some settings in the Arduino IDE. Once you have it up and running (test the 'blink' sketch), then follow the instructions on the following page for installing the NeoPixel library:
Plug in your circuit and load up the sketch below:
// SPDX-FileCopyrightText: 2017 Becky Stern for Adafruit Industries
// SPDX-FileCopyrightText: 2017 Anne Barela for Adafruit Industries
// SPDX-FileCopyrightText: 2017 T Main for Adafruit Industries
// SPDX-FileCopyrightText: 2017 Leslie Birch for Adafruit Industries
//
// SPDX-License-Identifier: MIT
/*
Close Encounters hat with 10 neopixels by Leslie Birch for Adafruit Industries.
Notes play with each corresponding light.
Based on code by Becky Stern, Anne Barela and T Main for Adafruit Industries
http://learn.adafruit.com/adafruit-trinket-modded-stuffed-animal/animal-sounds
*/
const int speaker = 0; // the number of the speaker
#define PHOTOCELL 1 // cDS photocell on A1
// this section is Close Encounters Sounds
#define toneC 1046.50
#define toneG 1567.98
#define tonec 2093.00
#define toned 2349.32
#define tonee 2637.02
#define tonep 0
#define darkness_min 512 // analog 0-1024 0-512 (light, 513-1023 dark)
long vel = 20000;
// This section is NeoPixel Variables
#include <Adafruit_NeoPixel.h>
#define PIN 1
// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//Adafruit_NeoPixel strip = Adafruit_NeoPixel(10, 1, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip = Adafruit_NeoPixel(10, 1);
void setup() {
pinMode(speaker, OUTPUT);
Serial.println("setup");
//This is for Neopixel Setup
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop()
{
// turn lights and audio on when dark
// less than 50% light on analog pin
if ( analogRead(PHOTOCELL) > darkness_min ) {
alien(); // Close Encounters Loop
}
}
// the sound producing function
void beep (unsigned char speakerPin, int frequencyInHertz, long timeInMilliseconds)
{ // http://web.media.mit.edu/~leah/LilyPad/07_sound_code.html
int x;
long delayAmount = (long)(1000000/frequencyInHertz);
long loopTime = (long)((timeInMilliseconds*1000)/(delayAmount*2));
for (x=0;x<loopTime;x++)
{
digitalWrite(speakerPin,HIGH);
delayMicroseconds(delayAmount);
digitalWrite(speakerPin,LOW);
delayMicroseconds(delayAmount);
}
}
// Generate the Close Encounters LEDs
void alien() {
strip.setBrightness(64);
strip.setPixelColor(8, 255, 255, 0); //yellow front
strip.setPixelColor(3, 255, 255, 0); //yellow back
strip.show();
beep(speaker,toned,1000);
delay(25);
strip.setPixelColor(8, 0, 0, 0); //clear front
strip.setPixelColor(3, 0, 0, 0); //clear back
strip.show();
delay(25);
strip.setPixelColor(7, 255, 0, 255); //pink front
strip.setPixelColor(2, 255, 0, 255); //pink back
strip.show();
beep(speaker,tonee,1000);
delay(25);
strip.setPixelColor(7, 0, 0, 0); //clear front
strip.setPixelColor(2, 0, 0, 0); //clear back
strip.show();
delay(25);
strip.setPixelColor(4, 128, 255, 0); //green front
strip.setPixelColor(9, 128, 255, 0); //green back
strip.show();
beep(speaker,tonec,1000);
delay(25);
strip.setPixelColor(4, 0, 0, 0); //clear front
strip.setPixelColor(9, 0, 0, 0); //clear back
strip.show();
delay(25);
strip.setPixelColor(5, 0, 0, 255); //blue front
strip.setPixelColor(0, 0, 0, 255); //blue back
strip.show();
beep(speaker,toneC,1000);
delay(75);
strip.setPixelColor(5, 0, 0, 0); //clear front
strip.setPixelColor(0, 0, 0, 0); //clear back
strip.show();
delay(100);
strip.setPixelColor(6, 255, 0, 0); //red front
strip.setPixelColor(1, 255, 0, 0); //red back
strip.show();
beep(speaker,toneG,1000);
delay(100);
strip.setPixelColor(6, 0, 0, 0); //clear front
strip.setPixelColor(1, 0, 0, 0); //clear back
strip.show();
delay(100);
}
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