Morning Arduino boffins
I have just recently aquired an Arduino Uno and decided I would learn something new. I've got myself a NeoPixel header board which Im controlling via serial from a raspberry pi. As per the code below, I am entering a function on receipt of a charecter - in this case 'd'. What I want to do is be able to interupt the 'light show' by sending the arduino the letter 'a' to make it imediatly quit and flash a bright white light.
On the PI, the code (Truncated) is:
import serial
ser = serial.Serial('/dev/ttyACM0', 9600)
ser.write('d')
sleep(50)
ser.write('a')
On the Arduino
#include "SPI.h" // Comment out this line if using Trinket or Gemma
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 6
#define NUMPIXELS 40
#define BRIGHTNESS 30
#define NUM_LEDS 40
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRBW + NEO_KHZ800);
void setup()
{
pixels.begin(); // This initializes the NeoPixel library.
Serial.begin(9600);
}
void loop()
{
lightOn(10);
if (Serial.available() > 0) {
{
int Byte = Serial.read();
readserial(Byte);
}
}
}
void readserial(int inByte)
{
int i;
switch (inByte) {
case 'a':
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(255,255,255));
pixels.show();
}
delay(5000);
break;
case 'b':
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(255,255,255));
pixels.show();
}
break;
case 'c':
strip.setBrightness(BRIGHTNESS);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(0,0,0));
pixels.show();
}
break;
case 'd':
dance();
break;
default:
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(255,255,255));
pixels.show();
}
break;
}
}
void lightOn(int n)
{
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(0,0,0));
pixels.show();
}
}
void dance()
{
// Some example procedures showing how to display to the pixels:
colorWipe(strip.Color(255, 0, 0), 50); // Red
colorWipe(strip.Color(0, 255, 0), 50); // Green
colorWipe(strip.Color(0, 0, 255), 50); // Blue
colorWipe(strip.Color(255, 255, 255), 50); // White
whiteOverRainbow(20,75,5);
pulseWhite(5);
rainbowFade2White(3,3,1);
}
// 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);
}
}
void pulseWhite(uint8_t wait) {
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
delay(wait);
strip.show();
}
for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
delay(wait);
strip.show();
}
}
void rainbowFade2White(uint8_t wait, int rainbowLoops, int whiteLoops) {
float fadeMax = 100.0;
int fadeVal = 0;
uint32_t wheelVal;
int redVal, greenVal, blueVal;
for(int k = 0 ; k < rainbowLoops ; k ++){
for(int j=0; j<256; j++) { // 5 cycles of all colors on wheel
for(int i=0; i< strip.numPixels(); i++) {
wheelVal = Wheel(((i * 256 / strip.numPixels()) + j) & 255);
redVal = red(wheelVal) * float(fadeVal/fadeMax);
greenVal = green(wheelVal) * float(fadeVal/fadeMax);
blueVal = blue(wheelVal) * float(fadeVal/fadeMax);
strip.setPixelColor( i, strip.Color( redVal, greenVal, blueVal ) );
}
//First loop, fade in!
if(k == 0 && fadeVal < fadeMax-1) {
fadeVal++;
}
//Last loop, fade out!
else if(k == rainbowLoops - 1 && j > 255 - fadeMax ){
fadeVal--;
}
strip.show();
delay(wait);
}
}
delay(500);
for(int k = 0 ; k < whiteLoops ; k ++){
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
strip.show();
}
delay(2000);
for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
strip.show();
}
}
delay(500);
}
void whiteOverRainbow(uint8_t wait, uint8_t whiteSpeed, uint8_t whiteLength ) {
if(whiteLength >= strip.numPixels()) whiteLength = strip.numPixels() - 1;
int head = whiteLength - 1;
int tail = 0;
int loops = 3;
int loopNum = 0;
static unsigned long lastTime = 0;
while(true){
for(int j=0; j<256; j++) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
if((i >= tail && i <= head) || (tail > head && i >= tail) || (tail > head && i <= head) ){
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
else{
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
}
if(millis() - lastTime > whiteSpeed) {
head++;
tail++;
if(head == strip.numPixels()){
loopNum++;
}
lastTime = millis();
}
if(loopNum == loops) return;
head%=strip.numPixels();
tail%=strip.numPixels();
strip.show();
delay(wait);
}
}
}
void fullWhite() {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
strip.show();
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256 * 5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
delay(wait);
}
}
void rainbow(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256; j++) {
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i+j) & 255));
}
strip.show();
delay(wait);
}
}
// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3,0);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3,0);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0,0);
}
uint8_t red(uint32_t c) {
return (c >> 8);
}
uint8_t green(uint32_t c) {
return (c >> 16);
}
uint8_t blue(uint32_t c) {
return (c);
}
Thanks in advance.