Created
April 4, 2014 00:24
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Color fades with ShiftBrite and MegaBrite pixels
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| #define clockpin 13 // CI | |
| #define enablepin 10 // EI | |
| #define latchpin 9 // LI | |
| #define datapin 11 // DI | |
| #define NumLEDs 1 | |
| int LEDChannels[NumLEDs][3] = {0}; | |
| int SB_CommandMode; | |
| int SB_RedCommand; | |
| int SB_GreenCommand; | |
| int SB_BlueCommand; | |
| const boolean invert = true; // set true if common anode, false if common cathode | |
| int color = 0; // a value from 0 to 255 representing the hue | |
| int R, G, B; // the Red Green and Blue color components | |
| void setup() { | |
| pinMode(datapin, OUTPUT); | |
| pinMode(latchpin, OUTPUT); | |
| pinMode(enablepin, OUTPUT); | |
| pinMode(clockpin, OUTPUT); | |
| SPCR = (1<<SPE)|(1<<MSTR)|(0<<SPR1)|(0<<SPR0); | |
| digitalWrite(latchpin, LOW); | |
| digitalWrite(enablepin, LOW); | |
| } | |
| void SB_SendPacket() { | |
| if (SB_CommandMode == B01) { | |
| SB_RedCommand = 120; | |
| SB_GreenCommand = 100; | |
| SB_BlueCommand = 100; | |
| } | |
| SPDR = SB_CommandMode << 6 | SB_BlueCommand>>4; | |
| while(!(SPSR & (1<<SPIF))); | |
| SPDR = SB_BlueCommand<<4 | SB_RedCommand>>6; | |
| while(!(SPSR & (1<<SPIF))); | |
| SPDR = SB_RedCommand << 2 | SB_GreenCommand>>8; | |
| while(!(SPSR & (1<<SPIF))); | |
| SPDR = SB_GreenCommand; | |
| while(!(SPSR & (1<<SPIF))); | |
| } | |
| void WriteLEDArray() { | |
| SB_CommandMode = B00; // Write to PWM control registers | |
| for (int h = 0;h<NumLEDs;h++) { | |
| SB_RedCommand = LEDChannels[h][0]; | |
| SB_GreenCommand = LEDChannels[h][1]; | |
| SB_BlueCommand = LEDChannels[h][2]; | |
| SB_SendPacket(); | |
| } | |
| delayMicroseconds(15); | |
| digitalWrite(latchpin,HIGH); // latch data into registers | |
| delayMicroseconds(15); | |
| digitalWrite(latchpin,LOW); | |
| SB_CommandMode = B01; // Write to current control registers | |
| for (int z = 0; z < NumLEDs; z++) SB_SendPacket(); | |
| delayMicroseconds(15); | |
| digitalWrite(latchpin,HIGH); // latch data into registers | |
| delayMicroseconds(15); | |
| digitalWrite(latchpin,LOW); | |
| } | |
| void loop() | |
| { | |
| int brightness = 255; // 255 is maximum brightness | |
| hueToRGB( color, brightness); // call function to convert hue to RGB | |
| /* | |
| // write the RGB values to the pins | |
| analogWrite(redPin, R); | |
| analogWrite(greenPin, G); | |
| analogWrite(bluePin, B ); | |
| // write the RGB values to the second set of pins for the second LED | |
| analogWrite(redPin2, R); | |
| analogWrite(greenPin2, G); | |
| analogWrite(bluePin2, B); | |
| */ | |
| LEDChannels[0][0] = R * 4; | |
| LEDChannels[0][1] = G * 4; | |
| LEDChannels[0][2] = B * 4; | |
| /* | |
| // white out the shiftbrite | |
| LEDChannels[0][0] = 1023; | |
| LEDChannels[0][1] = 1023; | |
| LEDChannels[0][2] = 1023; | |
| */ | |
| WriteLEDArray(); | |
| delay(20); | |
| color++; // increment the color | |
| if(color > 255) | |
| color = 0; | |
| delay(10); | |
| } | |
| // function to convert a color to its Red, Green, and Blue components. | |
| void hueToRGB( int hue, int brightness) | |
| { | |
| unsigned int scaledHue = (hue * 6); | |
| unsigned int segment = scaledHue / 256; // segment 0 to 5 around the | |
| // color wheel | |
| unsigned int segmentOffset = | |
| scaledHue - (segment * 256); // position within the segment | |
| unsigned int complement = 0; | |
| unsigned int prev = (brightness * ( 255 - segmentOffset)) / 256; | |
| unsigned int next = (brightness * segmentOffset) / 256; | |
| if(invert) | |
| { | |
| brightness = 255-brightness; | |
| complement = 255; | |
| prev = 255-prev; | |
| next = 255-next; | |
| } | |
| switch(segment ) { | |
| case 0: // red | |
| R = brightness; | |
| G = next; | |
| B = complement; | |
| break; | |
| case 1: // yellow | |
| R = prev; | |
| G = brightness; | |
| B = complement; | |
| break; | |
| case 2: // green | |
| R = complement; | |
| G = brightness; | |
| B = next; | |
| break; | |
| case 3: // cyan | |
| R = complement; | |
| G = prev; | |
| B = brightness; | |
| break; | |
| case 4: // blue | |
| R = next; | |
| G = complement; | |
| B = brightness; | |
| break; | |
| case 5: // magenta | |
| default: | |
| R = brightness; | |
| G = complement; | |
| B = prev; | |
| break; | |
| } | |
| } | |
| /* | |
| void loop() { | |
| LEDChannels[0][0] = 1023; | |
| LEDChannels[0][1] = 0; | |
| LEDChannels[0][2] = 0; | |
| LEDChannels[1][0] = 0; | |
| LEDChannels[1][1] = 0; | |
| LEDChannels[1][2] = 1023; | |
| WriteLEDArray(); | |
| delay(200); | |
| LEDChannels[0][0] = 0; | |
| LEDChannels[0][1] = 0; | |
| LEDChannels[0][2] = 1023; | |
| LEDChannels[1][0] = 1023; | |
| LEDChannels[1][1] = 0; | |
| LEDChannels[1][2] = 0; | |
| WriteLEDArray(); | |
| delay(200); | |
| LEDChannels[0][0] = 0; | |
| LEDChannels[0][1] = 1023; | |
| LEDChannels[0][2] = 0; | |
| LEDChannels[1][0] = 1023; | |
| LEDChannels[1][1] = 0; | |
| LEDChannels[1][2] = 0; | |
| WriteLEDArray(); | |
| delay(200); | |
| } | |
| */ |
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