This sketch shows the rough alignment of components for the project. Alternating strips of warm and cool white DotStar LEDs chain together to form a bank of light. For more detailed wiring instruction, visit the circuit diagram on the next page.
It pays to prototype your circuit on a solderless breadboard before soldering everything together. If you can manage to have a duplicate set of parts, that's even better-- you can use your working prototype as a model to work from when building the final soldered circuit.
Below is some rudamentary code for adjusting the brightness of the two LED strips using the membrane keypad as follows:
1: strip 1 brightness up
2: strip 1 brightness down
3: strip 2 brighness up
4: strip 2 brightness down
The brightness value incrementers don't have any thresholding, so values will "wrap around" (ie pressing 2 when the strips are off will raise that strip to full brightness).
Load the following code onto your Pro Trinket:
#include <Adafruit_DotStar.h>
// Because conditional #includes don't work w/Arduino sketches...
#include <SPI.h> // COMMENT OUT THIS LINE FOR GEMMA OR TRINKET
//#include <avr/power.h> // ENABLE THIS LINE FOR GEMMA OR TRINKET
#define NUMwarmPIXELS 60 // Number of LEDs in strip
#define NUMcoolPIXELS 60 // Number of LEDs in strip
#define DATAPINwarm 6
#define CLOCKPINwarm 8
#define DATAPINcool 3
#define CLOCKPINcool 4
Adafruit_DotStar warmStrip = Adafruit_DotStar(NUMwarmPIXELS, DATAPINwarm, CLOCKPINwarm);
Adafruit_DotStar coolStrip = Adafruit_DotStar(NUMcoolPIXELS, DATAPINcool, CLOCKPINcool);
#define DEBOUNCE 10 // button debouncer, how many ms to debounce, 5+ ms is usually plenty
// here is where we define the buttons that we'll use. button "1" is the first, button "6" is the 6th, etc
byte buttons[] = {9, 10, 11, 12}; // the analog 0-5 pins are also known as 14-19
// This handy macro lets us determine how big the array up above is, by checking the size
#define NUMBUTTONS sizeof(buttons)
// we will track if a button is just pressed, just released, or 'currently pressed'
byte pressed[NUMBUTTONS], justpressed[NUMBUTTONS], justreleased[NUMBUTTONS];
int warmBrightness = 0;
int coolBrightness = 0;
void setup() {
byte i;
// Make input & enable pull-up resistors on switch pins
for (i=0; i<NUMBUTTONS; i++){
pinMode(buttons[i], INPUT_PULLUP);
}
// pin13 LED
pinMode(13, OUTPUT);
warmStrip.begin(); // Initialize pins for output
warmStrip.show(); // Turn all LEDs off ASAP
coolStrip.begin(); // Initialize pins for output
coolStrip.show(); // Turn all LEDs off ASAP
fillAll(warmStrip.Color(255, 255, 255));
warmStrip.show();
coolStrip.show();
}
void loop() {
warmStrip.setBrightness(warmBrightness);
coolStrip.setBrightness(coolBrightness);
warmStrip.show();
coolStrip.show();
digitalWrite(13, LOW);
check_switches(); // when we check the switches we'll get the current state
for (byte i = 0; i<NUMBUTTONS; i++){
if (pressed[i]) {
digitalWrite(13, HIGH);
// is the button pressed down at this moment
}
if (justreleased[i]) {
if (i == 0){
warmBrightness+=5;
}else if (i == 1){
warmBrightness-=5;
}else if (i == 2){
coolBrightness+=5;
}else if (i == 3){
coolBrightness-=5;
}
}
}
for (byte i=0; i<NUMBUTTONS; i++){ // remember, check_switches() will necessitate clearing the 'just pressed' flag
justpressed[i] = 0;
}
}
void check_switches()
{
static byte previousstate[NUMBUTTONS];
static byte currentstate[NUMBUTTONS];
static long lasttime;
byte index;
if (millis() < lasttime){ // we wrapped around, lets just try again
lasttime = millis();
}
if ((lasttime + DEBOUNCE) > millis()) {
// not enough time has passed to debounce
return;
}
// ok we have waited DEBOUNCE milliseconds, lets reset the timer
lasttime = millis();
for (index = 0; index<NUMBUTTONS; index++){ // when we start, we clear out the "just" indicators
justreleased[index] = 0;
currentstate[index] = digitalRead(buttons[index]); // read the button
if (currentstate[index] == previousstate[index]) {
if ((pressed[index] == LOW) && (currentstate[index] == LOW)) {
// just pressed
justpressed[index] = 1;
}
else if ((pressed[index] == HIGH) && (currentstate[index] == HIGH)) {
// just released
justreleased[index] = 1;
}
pressed[index] = !currentstate[index]; // remember, digital HIGH means NOT pressed
}
//Serial.println(pressed[index], DEC);
previousstate[index] = currentstate[index]; // keep a running tally of the buttons
}
}
void fillAll(uint32_t c)
{
for(uint16_t i=0; i<warmStrip.numPixels(); i++) {
warmStrip.setPixelColor(i, c);
}
for(uint16_t i=0; i<coolStrip.numPixels(); i++) {
coolStrip.setPixelColor(i, c);
}
warmStrip.show();
coolStrip.show();
}
