Articles for February 2018

So, my new Nano testing board with screw terminal break out shield arrived. My soldering is not perfect, but I am still waiting on some flux and desoldering wick to arrive to have another go at it. I’ve certainly seen worse though 🙂

The new iteration of the code adds more animations and control with the keypad. We’ll soon start making videos and uploading them so you can get a glimpse into Team Accessible Pixel’s workshop 🙂

// interrupt_animation_3.ino
// designed by AccessiblePixel.com
//Include Libraries
#include <Adafruit_NeoPixel.h>
#include <Keypad.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
// Initialise Variables
#define PINBACK 9 // PIN for REAR light
#define PINFLOOR 10 // PIN for FLOOR light
#define PINFRONT 11 // PIN for FRONT light
volatile int frame=0;
volatile int backcolorframe=0;
volatile int r = 0;
volatile int g = 0;
volatile int b = 0;
volatile int brightred = 0;
volatile int brightgreen = 0;
volatile int brightblue = 0;
volatile int brightcolor = 0;
volatile int up = 0;
volatile int rainbowi = 0;
volatile int rainboww = 0;
// Initialise Pixels
Adafruit_NeoPixel stripBack = Adafruit_NeoPixel(16, PINBACK, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel stripFloor = Adafruit_NeoPixel(16, PINFLOOR, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel stripFront = Adafruit_NeoPixel(16, PINFRONT, NEO_GRB + NEO_KHZ800);
// Setup Keypad
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = { 8, 7, 6, 5 };
// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = { 4, 3, 2 }; 
// Create the Keypad
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
// Main Setup Loop (Run Once At Start Up)
void setup() {
// Initialize Back Pixels
stripBack.begin();
stripBack.show(); 
// Initialize Floor Pixels
stripFloor.begin();
stripFloor.show();
// Initialize Front Pixels
stripFront.begin();
stripFront.show();
// Setup Interrupt at 32hz
// Stop Interrupts
cli();
// Clear Timer Register
TCCR1A = 0;// Set entire TCCR1A register to 0
TCCR1B = 0;// Same for TCCR1B
TCNT1  = 0;// Initialize counter value to 0
// set compare match register for 32hz increments
OCR1A = 488;// = (16*10^6) / (32*1024) - 1 (must be <65536)
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);  
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
// Allow Interrupts
sei();
}//end setup loop
// Function Declarations
uint32_t wheelz(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return stripBack.Color(255 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 170) {
WheelPos -= 85;
return stripBack.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return stripBack.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<stripBack.numPixels(); i++) {
stripBack.setPixelColor(i, c);
stripBack.show();
delay(wait);
}
}
// Run Animation Frames
ISR(TIMER1_COMPA_vect){
if(frame==1){ 
stripBack.setPixelColor(0,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==2) {  
stripBack.setPixelColor(1,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==3) {  
stripBack.setPixelColor(2,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==4) {  
stripBack.setPixelColor(3,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==5) {  
stripBack.setPixelColor(4,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==6) {  
stripBack.setPixelColor(5,r,g,b);
delay(50);
stripBack.show(); 
frame++;
}
else if(frame==7) {  
stripBack.setPixelColor(6,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==8) {  
stripBack.setPixelColor(7,r,g,b);
delay(50);
stripBack.show(); 
frame++;
}
else if(frame==9) {  
stripBack.setPixelColor(8,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==10) {  
stripBack.setPixelColor(9,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==11) {  
stripBack.setPixelColor(10,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==12) {  
stripBack.setPixelColor(11,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==13) {  
stripBack.setPixelColor(12,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==14) {  
stripBack.setPixelColor(13,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==15) {  
stripBack.setPixelColor(14,r,g,b);
stripBack.show(); 
frame++;
}
else if(frame==16) {  
stripBack.setPixelColor(15,r,g,b);
stripBack.show(); 
}
else if(frame==17){ 
stripBack.setPixelColor(15,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==18) {  
stripBack.setPixelColor(14,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==19) {  
stripBack.setPixelColor(13,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==20) {  
stripBack.setPixelColor(12,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==21) {  
stripBack.setPixelColor(11,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==22) {  
stripBack.setPixelColor(10,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==23) {  
stripBack.setPixelColor(9,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==24) {  
stripBack.setPixelColor(8,0,0,0);
delay(50);
stripBack.show(); 
frame++;
}
else if(frame==25) {  
stripBack.setPixelColor(7,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==26) {  
stripBack.setPixelColor(6,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==27) {  
stripBack.setPixelColor(5,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==28) {  
stripBack.setPixelColor(4,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==29) {  
stripBack.setPixelColor(3,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==30) {  
stripBack.setPixelColor(2,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==31) {  
stripBack.setPixelColor(1,0,0,0);
stripBack.show(); 
frame++;
}
else if(frame==32) {  
stripBack.setPixelColor(0,0,0,0);
stripBack.show(); 
} else if(frame==33) {
stripBack.setPixelColor(random(0,15),random(0,25),random(0,25),random(0,25));
stripBack.setPixelColor(random(0,15),0,0,0,0);
stripBack.setPixelColor(random(0,15),0,0,0,0);
delay(30);
stripBack.show();
}
else if(frame==34){stripBack.setPixelColor(0,0,0,0);
stripBack.setPixelColor(1,0,0,0);
stripBack.setPixelColor(2,0,0,0);
stripBack.setPixelColor(3,0,0,0);
stripBack.setPixelColor(4,0,0,0);
stripBack.setPixelColor(5,0,0,0);
stripBack.setPixelColor(6,0,0,0);
stripBack.setPixelColor(7,0,0,0);
stripBack.setPixelColor(8,0,0,0);
stripBack.setPixelColor(9,0,0,0);
stripBack.setPixelColor(10,0,0,0);
stripBack.setPixelColor(11,0,0,0);
stripBack.setPixelColor(12,0,0,0);
stripBack.setPixelColor(13,0,0,0);
stripBack.setPixelColor(14,0,0,0);
stripBack.setPixelColor(15,0,0,0);
stripBack.show();
}
else if(frame==35){
stripBack.setPixelColor(0,brightred,brightgreen,brightblue);
stripBack.setPixelColor(1,brightred,brightgreen,brightblue);
stripBack.setPixelColor(2,brightred,brightgreen,brightblue);
stripBack.setPixelColor(3,brightred,brightgreen,brightblue);
stripBack.setPixelColor(4,brightred,brightgreen,brightblue);
stripBack.setPixelColor(5,brightred,brightgreen,brightblue);
stripBack.setPixelColor(6,brightred,brightgreen,brightblue);
stripBack.setPixelColor(7,brightred,brightgreen,brightblue);
stripBack.setPixelColor(8,brightred,brightgreen,brightblue);
stripBack.setPixelColor(9,brightred,brightgreen,brightblue);
stripBack.setPixelColor(10,brightred,brightgreen,brightblue);
stripBack.setPixelColor(11,brightred,brightgreen,brightblue);
stripBack.setPixelColor(12,brightred,brightgreen,brightblue);
stripBack.setPixelColor(13,brightred,brightgreen,brightblue);
stripBack.setPixelColor(14,brightred,brightgreen,brightblue);
stripBack.setPixelColor(15,brightred,brightgreen,brightblue);
stripBack.show();
if (brightcolor==0) {
if (up == 0) {
if (brightred < 60) {
brightred++; 
}
else if (brightred == 60) {
brightred=60; 
up = 1;
} 
}
else if(up == 1) {
if(brightred > 0) {
brightred--;
} 
else if (brightred == 0) {
up = 0;brightcolor++;
} 
}
} 
else if (brightcolor==1) {
if (up == 0) {
if (brightgreen < 60) {
brightgreen++; 
}
else if (brightgreen == 60) {
brightgreen=60; 
up = 1;
} 
}
else if(up == 1) {
if(brightgreen > 0) {
brightgreen--;
} 
else if (brightgreen == 0) {
up = 0;brightcolor++;
} 
}
} 
else if (brightcolor==2) {
if (up == 0) {
if (brightblue < 60) {
brightblue++; 
}
else if (brightblue == 60) {
brightblue=60; 
up = 1;
} 
}
else if(up == 1) {
if(brightblue > 0) {
brightblue--;
} 
else if (brightblue == 0) {
up = 0;brightcolor=0;
} 
}
}            
}
else if(frame==36){
stripBack.setPixelColor(rainbowi, wheelz((rainbowi+rainboww) & 255));
stripFloor.setPixelColor(rainbowi, wheelz((rainbowi+rainboww) & 255));
stripFront.setPixelColor(rainbowi, wheelz((rainbowi+rainboww) & 255));
stripBack.show();
stripFloor.show();
stripFront.show();
if (rainbowi < 15 )
{ rainbowi++; } else if (rainbowi == 15) { rainbowi = 0; }
if (rainboww < 255 )
{rainboww++; } if (rainboww == 255) {rainboww =0; }
}
else if(frame==37){frame=0;}
}
void loop()
{
char key = kpd.getKey();
if(key)  // Check for a valid key.
{
switch (key)
{
case '1':
if(backcolorframe==0) {  
r = 60;
g = 0;
b = 0;
backcolorframe++;
frame = 1;
}
else if(backcolorframe==1) {
r = 0;
g = 60;
b = 0;
backcolorframe++; frame = 1;
}
else if(backcolorframe==2) {
r = 0;
g = 0;
b = 60;
backcolorframe++; frame = 1;
}
else if(backcolorframe==3) {
r = 30;
g = 0;
b = 30;
backcolorframe++; frame = 1;
}
else if(backcolorframe==4) {
r = 30;
g = 30;
b = 30;
backcolorframe=0; frame = 1;
}
break;
case '2':
frame = 17;
backcolorframe=0;
break;
case '3':
frame = 33;
break;
case '4':
frame = 35;
up = 0;
break;
case '*':
frame = 36;
break;
case '0':
frame = 34;
backcolorframe=0;
brightcolor=0;
brightred = 0;
brightgreen = 0;
brightblue = 0;
r = 0;
g = 0;
b = 0;
up = 0;
rainbowi = 0;
rainboww = 0;
break;
default:
break;
}
}
}

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 9
// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino 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)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRB + NEO_KHZ800);
// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel.  Avoid connecting
// on a live circuit...if you must, connect GND first.
volatile int frame=0;
#include <Keypad.h>
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'A','0','B'}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = { 8, 7, 6, 5 };
// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = { 4, 3, 2 }; 
// Create the Keypad
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup() {
strip.begin();
strip.show(); // Initialize all pixels to 'off'
//set pins as outputs
pinMode(13, OUTPUT);
// Fill the dots one after the other with a color
cli();//stop interrupts
//set timer1 interrupt at 1Hz
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1  = 0;//initialize counter value to 0
// set compare match register for 1hz increments
OCR1A = 977;// = (16*10^6) / (8*1024) - 1 (must be <65536)
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);  
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
sei();//allow interrupts
}//end setup
ISR(TIMER1_COMPA_vect){//timer1 interrupt 1Hz toggles pin 13 (LED)
//generates pulse wave of frequency 1Hz/2 = 0.5kHz (takes two cycles for full wave- toggle high then toggle low)
if(frame==1){ 
strip.setPixelColor(0,60,0,0);
strip.show(); 
frame++;
}
else if(frame==2) {  
strip.setPixelColor(1,60,0,0);
strip.show(); 
frame++;
}
else if(frame==3) {  
strip.setPixelColor(2,60,0,0);
strip.show(); 
frame++;
}
else if(frame==4) {  
strip.setPixelColor(3,60,0,0);
strip.show(); 
frame++;
}
else if(frame==5) {  
strip.setPixelColor(4,60,0,0);
strip.show(); 
frame++;
}
else if(frame==6) {  
strip.setPixelColor(5,60,0,0);
delay(50);
strip.show(); 
frame++;
}
else if(frame==7) {  
strip.setPixelColor(6,60,0,0);
strip.show(); 
frame++;
}
else if(frame==8) {  
strip.setPixelColor(7,60,0,0);
delay(50);
strip.show(); 
frame++;
}
else if(frame==9) {  
strip.setPixelColor(8,60,0,0);
strip.show(); 
frame++;
}
else if(frame==10) {  
strip.setPixelColor(9,60,0,0);
strip.show(); 
frame++;
}
else if(frame==11) {  
strip.setPixelColor(10,60,0,0);
strip.show(); 
frame++;
}
else if(frame==12) {  
strip.setPixelColor(11,60,0,0);
strip.show(); 
frame++;
}
else if(frame==13) {  
strip.setPixelColor(12,60,0,0);
strip.show(); 
frame++;
}
else if(frame==14) {  
strip.setPixelColor(13,60,0,0);
strip.show(); 
frame++;
}
else if(frame==15) {  
strip.setPixelColor(14,60,0,0);
strip.show(); 
frame++;
}
else if(frame==16) {  
strip.setPixelColor(15,60,0,0);
strip.show(); 
}
else if(frame==17){ 
strip.setPixelColor(15,0,0,0);
strip.show(); 
frame++;
}
else if(frame==18) {  
strip.setPixelColor(14,0,0,0);
strip.show(); 
frame++;
}
else if(frame==19) {  
strip.setPixelColor(13,0,0,0);
strip.show(); 
frame++;
}
else if(frame==20) {  
strip.setPixelColor(12,0,0,0);
strip.show(); 
frame++;
}
else if(frame==21) {  
strip.setPixelColor(11,0,0,0);
strip.show(); 
frame++;
}
else if(frame==22) {  
strip.setPixelColor(10,0,0,0);
delay(50);
strip.show(); 
frame++;
}
else if(frame==23) {  
strip.setPixelColor(9,0,0,0);
strip.show(); 
frame++;
}
else if(frame==24) {  
strip.setPixelColor(8,0,0,0);
delay(50);
strip.show(); 
frame++;
}
else if(frame==25) {  
strip.setPixelColor(7,0,0,0);
strip.show(); 
frame++;
}
else if(frame==26) {  
strip.setPixelColor(6,0,0,0);
strip.show(); 
frame++;
}
else if(frame==27) {  
strip.setPixelColor(5,0,0,0);
strip.show(); 
frame++;
}
else if(frame==28) {  
strip.setPixelColor(4,0,0,0);
strip.show(); 
frame++;
}
else if(frame==29) {  
strip.setPixelColor(3,0,0,0);
strip.show(); 
frame++;
}
else if(frame==30) {  
strip.setPixelColor(2,0,0,0);
strip.show(); 
frame++;
}
else if(frame==31) {  
strip.setPixelColor(1,0,0,0);
strip.show(); 
frame++;
}
else if(frame==32) {  
strip.setPixelColor(0,0,0,0);
strip.show(); 
} else if(frame==33) {
strip.setPixelColor(random(16),random(0,25),random(0,25),random(0,25));
strip.setPixelColor(random(16),0,0,0,0);
strip.setPixelColor(random(16),0,0,0,0);
delay(30);
strip.show();
}
else if(frame==34){frame=0;}
}
void loop()
{
char key = kpd.getKey();
if(key)  // Check for a valid key.
{
switch (key)
{
case '1':
frame = 1;
break;
case '2':
frame = 17;
break;
case '3':
frame = 33;
break;
default:
break;
}
}
}
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}

Here is some of my test code for setting up a timer1 interrupt. It is based on some code that I found at http://www.instructables.com/id/Arduino-Timer-Interrupts/

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 9
// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino 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)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRB + NEO_KHZ800);
// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel.  Avoid connecting
// on a live circuit...if you must, connect GND first.
boolean toggle1 = 0;
void setup() {
strip.begin();
strip.show(); // Initialize all pixels to 'off'
//set pins as outputs
pinMode(13, OUTPUT);
// Fill the dots one after the other with a color
cli();//stop interrupts
//set timer1 interrupt at 1Hz
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1  = 0;//initialize counter value to 0
// set compare match register for 1hz increments
OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS12 and CS10 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);  
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
sei();//allow interrupts
}//end setup
ISR(TIMER1_COMPA_vect){//timer1 interrupt 1Hz toggles pin 13 (LED)
//generates pulse wave of frequency 1Hz/2 = 0.5kHz (takes two cycles for full wave- toggle high then toggle low)
if (toggle1){    
digitalWrite(13,HIGH);
toggle1 = 0;
}
else{
digitalWrite(13,LOW);
toggle1 = 1;
}
}
void loop() {
colorWipe(strip.Color(1, 1, 1), 25);
colorWipe(strip.Color(0, 0, 0), 25);
}
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}

The time has come where we need to test all the hardware we have bought to this point.

I have modified some basic test source files to test the WS2812 LEDs, the 4×3 Matrix Keypad and the Arduino Uno
To test the keypad, use the following code.

/*  Keypadtest.pde
*
*  Demonstrate the simplest use of the  keypad library.
*
*  The first step is to connect your keypad to the
*  Arduino  using the pin numbers listed below in
*  rowPins[] and colPins[]. If you want to use different
*  pins then  you  can  change  the  numbers below to
*  match your setup.
*
*/
#include <Keypad.h>
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'A','0','B'}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = { 8, 7, 6, 5 };
// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = { 4, 3, 2 }; 
// Create the Keypad
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
#define ledpin 14
void setup()
{
pinMode(ledpin,OUTPUT);
digitalWrite(ledpin, HIGH);
Serial.begin(9600);
}
void loop()
{
char key = kpd.getKey();
if(key)  // Check for a valid key.
{
switch (key)
{
case '*':
digitalWrite(ledpin, LOW);
break;
case '#':
digitalWrite(ledpin, HIGH);
break;
default:
Serial.println(key);
}
}
}

This is based on the standard Keypad Test Example File. This assumes that PIN 1 (onwards) from the Matrix is connected to PIN 2 (onwards) on the arduino. Pressing keys on the keypad will send data to the serial monitor in the arduino console and cause an LED to flash.

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 6
// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino 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)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRB + NEO_KHZ800);
// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel.  Avoid connecting
// on a live circuit...if you must, connect GND first.
void setup() {
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
// Some example procedures showing how to display to the pixels:
colorWipe(strip.Color(153, 32, 153), 500); // pink-white
colorWipe(strip.Color(153, 153, 153), 500); // white
colorWipe(strip.Color(153, 32, 153), 500); // pink-white
colorWipe(strip.Color(1, 0, 0), 25); // Red
colorWipe(strip.Color(0, 1, 0), 25); // Green
colorWipe(strip.Color(0, 0, 1), 25); // Blue
colorWipe(strip.Color(10, 0, 0), 25); // Red
colorWipe(strip.Color(0, 10, 0), 25); // Green
colorWipe(strip.Color(0, 0, 10), 25); // Blue
colorWipe(strip.Color(25, 0, 0), 25); // Red
colorWipe(strip.Color(0, 25, 0), 25); // Green
colorWipe(strip.Color(0, 0, 25), 25); // Blue
colorWipe(strip.Color(50, 0, 0), 25); // Red
colorWipe(strip.Color(0, 50, 0), 25); // Green
colorWipe(strip.Color(0, 0, 50), 25); // Blue
colorWipe(strip.Color(100, 0, 0), 25); // Red
colorWipe(strip.Color(0, 100, 0), 25); // Green
colorWipe(strip.Color(0, 0, 100), 25); // Blue
colorWipe(strip.Color(153, 0, 0), 25); // Red
colorWipe(strip.Color(0, 153, 0), 25); // Green
colorWipe(strip.Color(0, 0, 153), 25); // Blue
colorWipe(strip.Color(200, 0, 0), 25); // Red
colorWipe(strip.Color(0, 200, 0), 25); // Green
colorWipe(strip.Color(0, 0, 200), 25); // Blue
// Send a theater pixel chase in...
theaterChase(strip.Color(70, 70, 70), 250); // White
theaterChase(strip.Color(70, 0, 0), 250); // Red
theaterChase(strip.Color(0, 0, 70), 250); // Blue
theaterChase(strip.Color(0, 70, 70), 250); // Blue
theaterChase(strip.Color(70, 0, 70), 250); // Blue
theaterChase(strip.Color(0, 70, 0), 250); // Blue
}
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}
//Theatre-style crawling lights.
void theaterChase(uint32_t c, uint8_t wait) {
for (int j=0; j<10; j++) {  //do 10 cycles of chasing
for (int q=0; q < 3; q++) {
for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, c);    //turn every third pixel on
}
strip.show();
delay(wait);
for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, 0);        //turn every third pixel off
}
}
}
}

This is based on the srandtest included with the Adafruit NeoPixel Library (which is required for this to work). This assumes that your DATA pin is 6.

Initially we were working on data from our supplier that each of the LEDs in the pixel strings used about 18 mA of power on average. In our default 2 x 8 stick layout, this would mean since we have 16 pixels, that would mean an average consumption of 288mA per Accessible Pixel Stick. However, these estimates aren’t quite right for maximum power consumption.

18mA per LED: 16 x 18mA = 288mA per Accessible Pixel Stick
Approximate power dissipation ( 5v x 0.66A ): 1.44 watts

After testing both an NeoPixel clone from the UK mixed with a generic WS2812-8 from China, the maximum current draw that we have measured is approximately 660mA. This is with every pixel set to maximum (255 on each colour) so it’s a very bright almost white.

Working backwards this means that the maximum current draw would be 660mA

660mA / 16 = 41.25mA per LED
Approximate power dissipation ( 5v x 0.66A ): 3.3 watts

Knowing what we know about LEDs, however, each LED would theoretically draw a maximum of about 20mA, so each pixel at full intensity would run at 60mA giving us a total per Accessible Pixel Stick of 960mA

20mA per LED: 16 x 60mA = 960mA per Accessible Pixel Stick
Approximate Power dissipation ( 5v x 0.96A ): 4.8 watts

Of course, we won’t be running these LEDs at maximum, for both thermal and for the life of the LED strips. We’d probably recommend running them at 60% of maximum as the highest setting.

960mA * 60 / 100 = 576mA per Accessible Pixel Stick
Approximate Power dissipation ( 5v x 0.576A ): 2.88 watts

2.88 watts over 16 LEDs sounds like a good upper limit for the LEDs to us.