1  // SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  /**************************************************************************/
 6  /*!
 7  This is a demo for the Adafruit QT2040 Trinkey and the MCP9808 temperature
 8  sensor.
 9  QT2040 Trinkey - https://www.adafruit.com/product/5056
10  MCP9808 - https://www.adafruit.com/product/5027
11  
12  */
13  /**************************************************************************/
14  #include "Adafruit_MCP9808.h"
15  #include <Adafruit_NeoPixel.h>
16  
17  // Create the neopixel strip with the built in definitions NUM_NEOPIXEL and
18  // PIN_NEOPIXEL
19  Adafruit_NeoPixel pixel =
20      Adafruit_NeoPixel(NUM_NEOPIXEL, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
21  
22  // Create the MCP9808 temperature sensor object
23  Adafruit_MCP9808 mcp9808 = Adafruit_MCP9808();
24  
25  long previousMillis = 0;
26  long intervalTemp = 2000;
27  bool last_button = false;
28  
29  void setup() {
30    Serial.begin(115200);
31    delay(100);
32  
33    pinMode(PIN_SWITCH, INPUT_PULLUP); // Setup the BOOT button
34  
35    pixel.begin();
36    pixel.setBrightness(20);
37    pixel.show(); // Initialize all pixels to 'off'
38  
39    if (!mcp9808.begin(0x18)) {
40      Serial.println("Couldn't find MCP9808! Check your connections and verify "
41                     "the address is correct.");
42      while (1)
43        ;
44    }
45  
46    mcp9808.setResolution(3);
47  }
48  
49  uint8_t j = 0;
50  
51  void loop() {
52    bool curr_button = !digitalRead(PIN_SWITCH);
53  
54    pixel.setPixelColor(0, Wheel(j++));
55    pixel.show();
56  
57    unsigned long currentMillis = millis();
58    if (currentMillis - previousMillis > intervalTemp) {
59      previousMillis = currentMillis;
60      // Read and print out the temperature.
61      float c = mcp9808.readTempC();
62      float f = mcp9808.readTempF();
63      Serial.print("Temp: ");
64      Serial.print(c, 4);
65      Serial.print("*C\t and ");
66      Serial.print(f, 4);
67      Serial.println("*F.");
68    }
69  
70    if (curr_button && !last_button) {
71      Serial.println("Button pressed!");
72    }
73    if (!curr_button && last_button) {
74      !Serial.println("Button released!");
75    }
76    last_button = curr_button;
77  
78    delay(10);
79  }
80  
81  // Input a value 0 to 255 to get a color value.
82  // The colours are a transition r - g - b - back to r.
83  uint32_t Wheel(byte WheelPos) {
84    if (WheelPos < 85) {
85      return pixel.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
86    } else if (WheelPos < 170) {
87      WheelPos -= 85;
88      return pixel.Color(255 - WheelPos * 3, 0, WheelPos * 3);
89    } else {
90      WheelPos -= 170;
91      return pixel.Color(0, WheelPos * 3, 255 - WheelPos * 3);
92    }
93  }