1  // SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  #include <Adafruit_NeoPixel.h>
 6  #include "Adafruit_FreeTouch.h"
 7  
 8  // Create the neopixel strip with the built in definitions NUM_NEOPIXEL and PIN_NEOPIXEL
 9  Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_NEOPIXEL, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
10  // Create the touch pad
11  Adafruit_FreeTouch qt = Adafruit_FreeTouch(PIN_TOUCH, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
12  
13  int16_t neo_brightness = 255; // initialize with highest brightness
14  
15  void setup() {
16    Serial.begin(9600);
17    //while (!Serial);
18    
19    strip.begin();
20    strip.setBrightness(neo_brightness);
21    strip.show(); // Initialize all pixels to 'off'
22  
23    analogReadResolution(12);  // set highest resolution
24  
25    if (! qt.begin())  
26      Serial.println("Failed to begin qt");
27  }
28  
29  void loop() {
30    uint16_t touch = qt.measure();
31    Serial.print("Touch: "); Serial.println(touch);
32  
33    uint16_t potval = analogRead(PIN_POTENTIOMETER);
34    Serial.print("Slider: ");
35    Serial.println((float)potval / 4095);
36    
37    uint8_t wheelval = map(potval, 0, 4095, 0, 255);
38    //Serial.print("Wheel: ");
39    //Serial.println(wheelval);
40    
41    // If the pad is touched, turn off neopix!
42    if (touch > 500) {
43      Serial.println("Touched!");
44      strip.setBrightness(0);
45    } else {
46      strip.setBrightness(255);
47    }
48    
49    for(int i=0; i< strip.numPixels(); i++) {
50      strip.setPixelColor(i, Wheel((wheelval+85) % 255));
51    }
52    
53    strip.show();
54    delay(10);
55  }     
56  
57  // Input a value 0 to 255 to get a color value.
58  // The colours are a transition r - g - b - back to r.
59  uint32_t Wheel(byte WheelPos) {
60    if(WheelPos < 85) {
61     return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
62    } else if(WheelPos < 170) {
63     WheelPos -= 85;
64     return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
65    } else {
66     WheelPos -= 170;
67     return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
68    }
69  }