Code to run Attiny85 with WS2812 integrated with RGB LED - arduino

Question

I am trying to work with this chip:
https://www.adafruit.com/products/1655? ... fgodFpsAow
+
a Attiny85
The code I am using is below, it works fine with an Arduino but not with the Attiny85 (just turns on and stays between 2 colors green and yellow). Any ideas? Thanks!
My ATtiny is set at 8 Mhz with a 800Khz data stream in the neopixel.h library.
Code is below.
#include <Adafruit_NeoPixel.h>
/*
WS2811/Neopixel pattern switcher for ATtiny85 (and Arduino)
Requires Adafruit NeoPixel Library
WS2811 Signal, Digital Pin 4
Button, Digital Pin 0
GPL v3
*/
/*
shin:random pattern selector
*/
// Define
#define NUM_LEDS 1 //60LED per strip
#define DATA_PIN 0 //output pin on ATTiny85
#define BTN_PIN 1 //input pin on ATTiny85
#define BTN_DELAY 250 //add delay for debounce
#define NUM_PATTERNS 12 //patterns avail
#define CTR_THRESH 16
// Init Vars
uint8_t j = 0;
uint8_t pattern=1;
uint8_t buttonState=0;
uint8_t lastPix=0;
uint8_t myPix=0;
uint8_t direction=1;
uint8_t counter=0;
uint8_t colors[3];
uint32_t setColor=0;
unsigned long mark;
// Start Strip
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, DATA_PIN, NEO_GRB + NEO_KHZ800);
void setup() {
//pinMode(BTN_PIN, INPUT);
randomSeed(BTN_PIN);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
// if button pressed, advance, set mark
//chkBtn(digitalRead(BTN_PIN));
int rand = random(1,13);//1to12
// if pattern greater than #pattern reset
//if (pattern > NUM_PATTERNS) { pattern = 1; }
if (rand > NUM_PATTERNS) { pattern = 1; }
// choose a pattern
//pickPattern(pattern);
pickPattern(rand);
// set direction
if (direction == 1) { j++; } else { j--; }
if (j > 254) { direction = 0; }
if (j < 1) { direction = 1; }
}
/* pick a pattern */
void pickPattern(uint8_t var) {
switch (var) {
case 1:
// scanner, color and delay - RGB
scanner(strip.Color(255,0,0),50);
scanner(strip.Color(200,0,100),50);
scanner(strip.Color(64,0,200),50);
break;
case 2:
// color wipe random RGB
colorWipe(strip.Color(random(255), random(255), random(255)),50);
break;
case 3:
// color wave - Hue/Sat/Bright
// hue low (0-359), high (0-359),rate,extra delay
wavey(200,240,0.06,0);
break;
case 4:
// rainbow firefly, 1px at random
colorFirefly(60);
counter++;
break;
case 5:
// rainbow solid
rainbow(10);
counter++;
break;
case 6:
// bounce in and out
// tail len, counter, delay
bounceInOut(4,counter,20);
counter++;
break;
case 7:
// color wipe from center
colorWipeCenter(strip.Color(255,0,0),100);
colorWipeCenter(strip.Color(255,64,0),100);
break;
case 8:
// solid color
colorFast(strip.Color(255,0,0),0);
break;
case 9:
// fade even or odd
// 0-359 Hue value, even/odd, delay
fadeEveOdd(200,0,20);
fadeEveOdd(300,1,20);
break;
case 10:
// show rainbow
rainbowCycle(10);
break;
case 11:
// show rainbow
theaterChaseRainbow(50);
break;
case 12:
rainbowCycle2(20);
break;
}
}
/* check button state */
boolean chkBtn(int buttonState) {
if (buttonState == HIGH && (millis() - mark) > BTN_DELAY) {
j = 0;
mark = millis();
pattern++;
return true;
}
else { return false; }
}
void colorFirefly(int wait) {
if(myPix != lastPix) {
if(counter<CTR_THRESH) {
float colorV = sin((6.28/30)*(float)(counter)) *255;
HSVtoRGB((359/CTR_THRESH)*counter, 255, colorV, colors);
strip.setPixelColor(myPix, colors[0], colors[1], colors[2]);
strip.show();
delay(wait);
} else {
lastPix=myPix;
counter=0;
colorFast(0,0);
}
} else {
myPix=random(0,strip.numPixels());
}
}
// Fill the dots one after the other with a color
// Modified from Neopixel sketch to break on button press
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
if(chkBtn(digitalRead(BTN_PIN))) { break; }
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}
// color wipe from center
void colorWipeCenter(uint32_t c, uint8_t wait) {
uint8_t mid=strip.numPixels()/2;
strip.setPixelColor(mid,c);
for(uint16_t i=0; i<=strip.numPixels()/2; i++) {
if(chkBtn(digitalRead(BTN_PIN))) { break; }
strip.setPixelColor(mid+i, c);
strip.setPixelColor(mid-i, c);
strip.show();
delay(wait);
}
}
// fast version
void colorFast(uint32_t c, uint8_t wait) {
for (uint16_t i = 0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, c);
}
strip.show();
delay(wait);
}
// Rainbow Cycle, modified from Neopixel sketch to break on button press
void rainbowCycle(uint8_t wait) {
uint16_t i;
// 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;
//for(j=0; j<256; j++) {
for (i = 0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i + j) & 255));
}
strip.show();
delay(wait);
// }
}
// scanner
void scanner(uint32_t c,uint8_t wait) {
for(int i=0; i< strip.numPixels(); i++) {
if(chkBtn(digitalRead(BTN_PIN))) { break; }
colorFast(0,0);
strip.setPixelColor(i,c);
strip.show();
delay(wait);
}
for(int i=strip.numPixels(); i>0; i--) {
if(chkBtn(digitalRead(BTN_PIN))) { break; }
colorFast(0,0);
strip.setPixelColor(i,c);
strip.show();
delay(wait);
}
}
// scanner to midpoint
void bounceInOut(uint8_t num, uint8_t start,uint8_t wait) {
colorFast(0,0);
uint8_t color=200;
for(int q=0; q < num; q++) {
if(strip.numPixels()-start >= 0 && start < NUM_LEDS) {
strip.setPixelColor(start+q, strip.Color(0,color,0));
strip.setPixelColor(strip.numPixels()-start-q, strip.Color(0,color,0));
}
color=round(color/2.0);
strip.show();
delay(wait);
}
if(counter > strip.numPixels()) { counter=0; }
}
void fadeEveOdd(int c1,byte rem,uint8_t wait) {
for(int j=0; j < CTR_THRESH; j++) {
for(int i=0; i< strip.numPixels(); i++) {
if(i % 2== rem) {
HSVtoRGB(c1,255,(255/CTR_THRESH)*j,colors);
strip.setPixelColor(i,colors[0],colors[1],colors[2]);
}
}
if(chkBtn(digitalRead(BTN_PIN))) { break; }
strip.show();
delay(wait);
}
for(int j=CTR_THRESH; j >= 0; j--) {
for(int i=0; i< strip.numPixels(); i++) {
if(i % 2== rem) {
HSVtoRGB(c1,255,(255/CTR_THRESH)*j,colors);
strip.setPixelColor(i,colors[0],colors[1],colors[2]);
}
}
if(chkBtn(digitalRead(BTN_PIN))) { break; }
strip.show();
delay(wait);
}
}
// twinkle random number of pixels
void twinkleRand(int num,uint32_t c,uint32_t bg,int wait) {
// set background
colorFast(bg,0);
// for each num
for (int i=0; i<num; i++) {
strip.setPixelColor(random(strip.numPixels()),c);
}
strip.show();
delay(wait);
}
// sine wave, low (0-359),high (0-359), rate of change, wait
void wavey(int low,int high,float rt,uint8_t wait) {
float in,out;
int diff=high-low;
int step = diff/strip.numPixels();
for (in = 0; in < 6.283; in = in + rt) {
for(int i=0; i< strip.numPixels(); i++) {
out=sin(in+i*(6.283/strip.numPixels())) * diff + low;
HSVtoRGB(out,255,255,colors);
strip.setPixelColor(i,colors[0],colors[1],colors[2]);
}
strip.show();
delay(wait);
if(chkBtn(digitalRead(BTN_PIN))) { break; }
}
}
// sine wave, intensity
void waveIntensity(float rt,uint8_t wait) {
float in,level;
for (in = 0; in < 6.283; in = in + rt) {
for(int i=0; i< strip.numPixels(); i++) {
// sine wave, 3 offset waves make a rainbow!
level = sin(i+in) * 127 + 128;
// set color level
strip.setPixelColor(i,(int)level,0,0);
}
strip.show();
delay(wait);
if(chkBtn(digitalRead(BTN_PIN))) { break; }
}
}
// helpers
uint32_t Wheel(byte WheelPos) {
if (WheelPos < 85) {
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
} else if (WheelPos < 170) {
WheelPos -= 85;
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
} else {
WheelPos -= 170;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
}
// HSV to RGB colors
// hue: 0-359, sat: 0-255, val (lightness): 0-255
// adapted from http://funkboxing.com/wordpress/?p=1366
void HSVtoRGB(int hue, int sat, int val, uint8_t * colors) {
int r, g, b, base;
if (sat == 0) { // Achromatic color (gray).
colors[0] = val;
colors[1] = val;
colors[2] = val;
} else {
base = ((255 - sat) * val) >> 8;
switch (hue / 60) {
case 0:
colors[0] = val;
colors[1] = (((val - base) * hue) / 60) + base;
colors[2] = base;
break;
case 1:
colors[0] = (((val - base) * (60 - (hue % 60))) / 60) + base;
colors[1] = val;
colors[2] = base;
break;
case 2:
colors[0] = base;
colors[1] = val;
colors[2] = (((val - base) * (hue % 60)) / 60) + base;
break;
case 3:
colors[0] = base;
colors[1] = (((val - base) * (60 - (hue % 60))) / 60) + base;
colors[2] = val;
break;
case 4:
colors[0] = (((val - base) * (hue % 60)) / 60) + base;
colors[1] = base;
colors[2] = val;
break;
case 5:
colors[0] = val;
colors[1] = base;
colors[2] = (((val - base) * (60 - (hue % 60))) / 60) + base;
break;
}
}
}
//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
for (int j=0; j < 256; j++) { // cycle all 256 colors in the wheel
for (int q=0; q < 3; q++) {
for (int i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, Wheel( (i+j) % 255)); //turn every third pixel on
}
strip.show();
delay(wait);
for (int i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, 0); //turn every third pixel off
}
}
}
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle2(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);
}
}

Answer 1

Hi all thank you very much for the help. I've ended up fixing it. See below:
"
The memory was okay. I think you were right that the clock speeds are different for the arduino and the attiny.
I ended up using the libraries found here:
https://github.com/cpldcpu/light_ws2812
Then I loaded the AVR example. I had to copy the ws2812 library into my actual code as the Arduino library wasn't able to find the library. After doing that it finally worked.
"
Thanks for all the help!
Dave

Answer 2

Another solution is to include:
ifdef AVR
include <avr/power.h>
endif
and change the setup:
#if defined (__AVR_ATtiny45__)
if (F_CPU == 8000000) clock_prescale_set(clock_div_1);
#endif
Code below:
// This is a demonstration on how to use an input device to trigger changes on your neo pixels.
// You should wire a momentary push button to connect from ground to a digital IO pin. When you
// press the button it will change to a new pixel animation. Note that you need to press the
// button once to start the first animation!
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define BUTTON_PIN 0 // Digital IO pin connected to the button. This will be
// driven with a pull-up resistor so the switch should
// pull the pin to ground momentarily. On a high -> low
// transition the button press logic will execute.
#define PIXEL_PIN 4 // Digital IO pin connected to the NeoPixels.
#define PIXEL_COUNT 8
// Parameter 1 = number of pixels in strip, neopixel stick has 8
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_RGB Pixels are wired for RGB bitstream
// NEO_GRB Pixels are wired for GRB bitstream, correct for neopixel stick
// NEO_KHZ400 400 KHz bitstream (e.g. FLORA pixels)
// NEO_KHZ800 800 KHz bitstream (e.g. High Density LED strip), correct for neopixel stick
Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);
bool oldState = HIGH;
int showType = 0;
void setup() {
// This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny45__)
if (F_CPU == 8000000) clock_prescale_set(clock_div_1);
#endif
// End of trinket special code
pinMode(BUTTON_PIN, INPUT_PULLUP);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
// Get current button state.
bool newState = digitalRead(BUTTON_PIN);
// Check if state changed from high to low (button press).
if (newState == LOW && oldState == HIGH) {
// Short delay to debounce button.
delay(20);
// Check if button is still low after debounce.
newState = digitalRead(BUTTON_PIN);
if (newState == LOW) {
showType++;
if (showType > 9)
showType=0;
startShow(showType);
}
}
// Set the last button state to the old state.
oldState = newState;
}
void startShow(int i) {
switch(i){
case 0: colorWipe(strip.Color(0, 0, 0), 50); // Black/off
break;
case 1: colorWipe(strip.Color(255, 0, 0), 50); // Red
break;
case 2: colorWipe(strip.Color(0, 255, 0), 50); // Green
break;
case 3: colorWipe(strip.Color(0, 0, 255), 50); // Blue
break;
case 4: theaterChase(strip.Color(127, 127, 127), 50); // White
break;
case 5: theaterChase(strip.Color(127, 0, 0), 50); // Red
break;
case 6: theaterChase(strip.Color( 0, 0, 127), 50); // Blue
break;
case 7: rainbow(20);
break;
case 8: rainbowCycle(20);
break;
case 9: theaterChaseRainbow(50);
break;
}
}
// 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 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);
}
}
// 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);
}
}
//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 (int i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, c); //turn every third pixel on
}
strip.show();
delay(wait);
for (int i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, 0); //turn every third pixel off
}
}
}
}
//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
for (int j=0; j < 256; j++) { // cycle all 256 colors in the wheel
for (int q=0; q < 3; q++) {
for (int i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, Wheel( (i+j) % 255)); //turn every third pixel on
}
strip.show();
delay(wait);
for (int i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, 0); //turn every third pixel off
}
}
}
}
// 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);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}

Answer 3

Troubleshooting these boards can be very challenging. My initial thought is that you might be running out of memory on the ATtiny. Have you tried a minimal amount of code with only one animation function just for testing?
Also it looks like there is a lot more activity on this topic over at the Electrical Engineering Stack Exchange:
https://electronics.stackexchange.com/questions/24269/checking-memory-footprint-in-arduino
https://electronics.stackexchange.com/questions/74872/memory-management-problems-with-attiny85