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\/* * ShiftPWM non-blocking RGB fades example, (c) Elco Jacobs, updated August 2012. * * This example for ShiftPWM shows how to control your LED's in a non-blocking way: no delay loops. * This example receives a number from the serial port to set the fading mode. Instead you can also read buttons or sensors. * It uses the millis() function to create fades. The block fades example might be easier to understand, so start there. * * Please go to www.elcojacobs.com\/shiftpwm for documentation, fuction reference and schematics. * If you want to use ShiftPWM with LED strips or high power LED's, visit the shop for boards. *\/ \/\/ ShiftPWM uses timer1 by default. To use a different timer, before '#include <ShiftPWM.h>', add \/\/ #define SHIFTPWM_USE_TIMER2 \/\/ for Arduino Uno and earlier (Atmega328) \/\/ #define SHIFTPWM_USE_TIMER3 \/\/ for Arduino Micro\/Leonardo (Atmega32u4) \/\/ Clock and data pins are pins from the hardware SPI, you cannot choose them yourself. \/\/ Data pin is MOSI (Uno and earlier: 11, Leonardo: ICSP 4, Mega: 51, Teensy 2.0: 2, Teensy 2.0++: 22) \/\/ Clock pin is SCK (Uno and earlier: 13, Leonardo: ICSP 3, Mega: 52, Teensy 2.0: 1, Teensy 2.0++: 21) \/\/ You can choose the latch pin yourself. const int ShiftPWM_latchPin=8; \/\/ ** uncomment this part to NOT use the SPI port and change the pin numbers. This is 2.5x slower ** \/\/ #define SHIFTPWM_NOSPI \/\/ const int ShiftPWM_dataPin = 11; \/\/ const int ShiftPWM_clockPin = 13; \/\/ If your LED's turn on if the pin is low, set this to true, otherwise set it to false. const bool ShiftPWM_invertOutputs = false; \/\/ You can enable the option below to shift the PWM phase of each shift register by 8 compared to the previous. \/\/ This will slightly increase the interrupt load, but will prevent all PWM signals from becoming high at the same time. \/\/ This will be a bit easier on your power supply, because the current peaks are distributed. const bool ShiftPWM_balanceLoad = false; #define rxPin 2 #define txPin 4 #include <SoftwareSerial.h> #include <ShiftPWM.h> \/\/ include ShiftPWM.h after setting the pins! \/\/ Function prototypes (telling the compiler these functions exist). void oneByOne(void); void inOutTwoLeds(void); void inOutAll(void); void alternatingColors(void); void hueShiftAll(void); void randomColors(void); void fakeVuMeter(void); void rgbLedRainbow(unsigned long cycleTime, int rainbowWidth); void printInstructions(void); void setColor(int r, int g, int b); \/\/ Here you set the number of brightness levels, the update frequency and the number of shift registers. \/\/ These values affect the load of ShiftPWM. \/\/ Choose them wisely and use the PrintInterruptLoad() function to verify your load. unsigned char maxBrightness = 255; unsigned char pwmFrequency = 75; unsigned int numRegisters = 6; unsigned int numOutputs = numRegisters*8; unsigned int numRGBLeds = numRegisters*8\/3; unsigned int fadingMode = 0; \/\/start with all LED's off. int r = 0; int g = 0; int b = 0; unsigned long startTime = 0; \/\/ start time for the chosen fading mode SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin); void setup(){ while(!Serial){ delay(100); } Serial.begin(9600); pinMode(rxPin, INPUT); pinMode(txPin, OUTPUT); \/\/ Sets the number of 8-bit registers that are used. ShiftPWM.SetAmountOfRegisters(numRegisters); \/\/ SetPinGrouping allows flexibility in LED setup. \/\/ If your LED's are connected like this: RRRRGGGGBBBBRRRRGGGGBBBB, use SetPinGrouping(4). ShiftPWM.SetPinGrouping(1); \/\/This is the default, but I added here to demonstrate how to use the funtion ShiftPWM.Start(pwmFrequency,maxBrightness); printInstructions(); mySerial.begin(9600); } void loop() { String command = ""; while (mySerial.available() > 0) { char c = mySerial.read(); Serial.println(c); command.concat(c); } command.trim(); if (command == "") { } else { startTime = millis(); } int firstCommaPos = -1; int lastCommaPos = -1; firstCommaPos = command.indexOf(','); lastCommaPos = command.lastIndexOf(','); if (firstCommaPos != -1 && lastCommaPos != -1 && lastCommaPos != firstCommaPos) { String rStr = command.substring(0, firstCommaPos); String gStr = command.substring(firstCommaPos + 1, lastCommaPos); String bStr = command.substring(lastCommaPos + 1); \/\/ Serial.println("r is -> " + rStr); \/\/ Serial.println("g is -> " + gStr); \/\/ Serial.println("b is -> " + bStr); r = rStr.toInt(); g = gStr.toInt(); b = bStr.toInt(); fadingMode = 10; } if (command == "a") fadingMode = 0; if (command == "b") fadingMode = 1; if (command == "c") fadingMode = 2; if (command == "d") fadingMode = 3; if (command == "e") fadingMode = 4; if (command == "f") fadingMode = 5; if (command == "g") fadingMode = 6; if (command == "h") fadingMode = 7; if (command == "i") fadingMode = 8; if (command == "j") fadingMode = 9; Serial.println("command is -> " + command); switch(fadingMode){ case 0: \/\/ Turn all LED's off. ShiftPWM.SetAll(0); break; case 1: oneByOne(); break; case 2: inOutAll(); break; case 3: inOutTwoLeds(); break; case 4: alternatingColors(); break; case 5: hueShiftAll(); break; case 6: randomColors(); break; case 7: fakeVuMeter(); break; case 8: rgbLedRainbow(3000,numRGBLeds); break; case 9: rgbLedRainbow(10000,5*numRGBLeds); break; case 10: setColor(r,g,b); break; default: Serial.println("Unknown Mode!"); delay(1000); break; } } void setColor(int r, int g, int b) { ShiftPWM.SetAll(0); ShiftPWM.SetAllRGB(r,g,b); } void oneByOne(void){ \/\/ Fade in and fade out all outputs one at a time unsigned char brightness; unsigned long fadeTime = 500; unsigned long loopTime = numOutputs*fadeTime*2; unsigned long time = millis()-startTime; unsigned long timer = time%loopTime; unsigned long currentStep = timer%(fadeTime*2); int activeLED = timer\/(fadeTime*2); if(currentStep <= fadeTime ){ brightness = currentStep*maxBrightness\/fadeTime; \/\/\/fading in } else{ brightness = maxBrightness-(currentStep-fadeTime)*maxBrightness\/fadeTime; \/\/\/fading out; } ShiftPWM.SetAll(0); ShiftPWM.SetOne(activeLED, brightness); } void inOutTwoLeds(void){ \/\/ Fade in and out 2 outputs at a time unsigned long fadeTime = 500; unsigned long loopTime = numOutputs*fadeTime; unsigned long time = millis()-startTime; unsigned long timer = time%loopTime; unsigned long currentStep = timer%fadeTime; int activeLED = timer\/fadeTime; unsigned char brightness = currentStep*maxBrightness\/fadeTime; ShiftPWM.SetAll(0); ShiftPWM.SetOne((activeLED+1)%numOutputs,brightness); ShiftPWM.SetOne(activeLED,maxBrightness-brightness); } void inOutAll(void){ \/\/ Fade in all outputs unsigned char brightness; unsigned long fadeTime = 2000; unsigned long time = millis()-startTime; unsigned long currentStep = time%(fadeTime*2); if(currentStep <= fadeTime ){ brightness = currentStep*maxBrightness\/fadeTime; \/\/\/fading in } else{ brightness = maxBrightness-(currentStep-fadeTime)*maxBrightness\/fadeTime; \/\/\/fading out; } ShiftPWM.SetAll(brightness); } void alternatingColors(void){ \/\/ Alternate LED's in 6 different colors unsigned long holdTime = 2000; unsigned long time = millis()-startTime; unsigned long shift = (time\/holdTime)%6; for(unsigned int led=0; led<numRGBLeds; led++){ switch((led+shift)%6){ case 0: ShiftPWM.SetRGB(led,255,0,0); \/\/ red break; case 1: ShiftPWM.SetRGB(led,0,255,0); \/\/ green break; case 2: ShiftPWM.SetRGB(led,0,0,255); \/\/ blue break; case 3: ShiftPWM.SetRGB(led,255,128,0); \/\/ orange break; case 4: ShiftPWM.SetRGB(led,0,255,255); \/\/ turqoise break; case 5: ShiftPWM.SetRGB(led,255,0,255); \/\/ purple break; } } } void hueShiftAll(void){ \/\/ Hue shift all LED's unsigned long cycleTime = 10000; unsigned long time = millis()-startTime; unsigned long hue = (360*time\/cycleTime)%360; ShiftPWM.SetAllHSV(hue, 255, 255); } void randomColors(void){ \/\/ Update random LED to random color. Funky! unsigned long updateDelay = 100; static unsigned long previousUpdateTime; if(millis()-previousUpdateTime > updateDelay){ previousUpdateTime = millis(); ShiftPWM.SetHSV(random(numRGBLeds),random(360),255,255); } } void fakeVuMeter(void){ \/\/ imitate a VU meter static unsigned int peak = 0; static unsigned int prevPeak = 0; static unsigned long currentLevel = 0; static unsigned long fadeStartTime = startTime; unsigned long fadeTime = (currentLevel*2);\/\/ go slower near the top unsigned long time = millis()-fadeStartTime; currentLevel = time%(fadeTime); if(currentLevel==peak){ \/\/ get a new peak value prevPeak = peak; while(abs(peak-prevPeak)<5){ peak = random(numRGBLeds); \/\/ pick a new peak value that differs at least 5 from previous peak } } if(millis() - fadeStartTime > fadeTime){ fadeStartTime = millis(); if(currentLevel<peak){ \/\/fading in currentLevel++; } else{ \/\/fading out currentLevel--; } } \/\/ animate to new top for(unsigned int led=0;led<numRGBLeds;led++){ if(led<currentLevel){ int hue = (numRGBLeds-1-led)*120\/numRGBLeds; \/\/ From green to red ShiftPWM.SetHSV(led,hue,255,255); } else if(led==currentLevel){ int hue = (numRGBLeds-1-led)*120\/numRGBLeds; \/\/ From green to red int value; if(currentLevel<peak){ \/\/fading in value = time*255\/fadeTime; } else{ \/\/fading out value = 255-time*255\/fadeTime; } ShiftPWM.SetHSV(led,hue,255,value); } else{ ShiftPWM.SetRGB(led,0,0,0); } } } void rgbLedRainbow(unsigned long cycleTime, int rainbowWidth){ \/\/ Displays a rainbow spread over a few LED's (numRGBLeds), which shifts in hue. \/\/ The rainbow can be wider then the real number of LED's. unsigned long time = millis()-startTime; unsigned long colorShift = (360*time\/cycleTime)%360; \/\/ this color shift is like the hue slider in Photoshop. for(unsigned int led=0;led<numRGBLeds;led++){ \/\/ loop over all LED's int hue = ((led)*360\/(rainbowWidth-1)+colorShift)%360; \/\/ Set hue from 0 to 360 from first to last led and shift the hue ShiftPWM.SetHSV(led, hue, 255, 255); \/\/ write the HSV values, with saturation and value at maximum } } void printInstructions(void){ Serial.println("---- ShiftPWM Non-blocking fades demo ----"); Serial.println(""); Serial.println("Type 'l' to see the load of the ShiftPWM interrupt (the % of CPU time the AVR is busy with ShiftPWM)"); Serial.println(""); Serial.println("Type any of these numbers to set the demo to this mode:"); Serial.println(" 0. All LED's off"); Serial.println(" 1. Fade in and out one by one"); Serial.println(" 2. Fade in and out all LED's"); Serial.println(" 3. Fade in and out 2 LED's in parallel"); Serial.println(" 4. Alternating LED's in 6 different colors"); Serial.println(" 5. Hue shift all LED's"); Serial.println(" 6. Setting random LED's to random color"); Serial.println(" 7. Fake a VU meter"); Serial.println(" 8. Display a color shifting rainbow as wide as the LED's"); Serial.println(" 9. Display a color shifting rainbow wider than the LED's"); Serial.println(""); Serial.println("Type 'm' to see this info again"); Serial.println(""); Serial.println("----"); } <\/code><\/pre>\n <\/div>\n<\/div>\n
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