Merge pull request #1572 from kattni/st-arduino

Arduino demo.

Author: ladyada

Slider_Trinkey/Arduino_Slider_Trinkey_Demo/.slidetrinkey_m0.test.only

@@ -0,0 +1,65 @@
+#include <Adafruit_NeoPixel.h>
+#include "Adafruit_FreeTouch.h"
+
+// Create the neopixel strip with the built in definitions NUM_NEOPIXEL and PIN_NEOPIXEL
+Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_NEOPIXEL, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
+// Create the touch pad
+Adafruit_FreeTouch qt = Adafruit_FreeTouch(PIN_TOUCH, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
+
+int16_t neo_brightness = 255; // initialize with highest brightness
+
+void setup() {
+  Serial.begin(9600);
+  //while (!Serial);
+  
+  strip.begin();
+  strip.setBrightness(neo_brightness);
+  strip.show(); // Initialize all pixels to 'off'
+
+  analogReadResolution(12);  // set highest resolution
+
+  if (! qt.begin())  
+    Serial.println("Failed to begin qt");
+}
+
+void loop() {
+  uint16_t touch = qt.measure();
+  Serial.print("Touch: "); Serial.println(touch);
+
+  uint16_t potval = analogRead(PIN_POTENTIOMETER);
+  Serial.print("Slider: ");
+  Serial.println((float)potval / 4095);
+  
+  uint8_t wheelval = map(potval, 0, 4095, 0, 255);
+  //Serial.print("Wheel: ");
+  //Serial.println(wheelval);
+  
+  // If the pad is touched, turn off neopix!
+  if (touch > 500) {
+    Serial.println("Touched!");
+    strip.setBrightness(0);
+  } else {
+    strip.setBrightness(255);
+  }
+  
+  for(int i=0; i< strip.numPixels(); i++) {
+    strip.setPixelColor(i, Wheel((wheelval+85) % 255));
+  }
+  
+  strip.show();
+  delay(10);
+}     
+
+// 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) {
+  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);
+  }
+}