1  // SPDX-FileCopyrightText: 2018 Limor Fried for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  /*************************************************** 
 6  This is a library for the MLX90614 temperature sensor SPECIFICALLY
 7  FOR USE WITH TINYWIREM ON TRINKET/GEMMA
 8  
 9  Requires the latest TinyWireM with repeated-start support
10  https://github.com/adafruit/TinyWireM
11  
12  NOT FOR REGULAR ARDUINOS! Use the regular Adafruit_MLX90614 for that
13  
14    Designed specifically to work with the MLX90614 sensors in the
15    adafruit shop
16    ----> https://www.adafruit.com/products/1748
17    ----> https://www.adafruit.com/products/1749
18  
19    These sensors use I2C to communicate, 2 pins are required to  
20    interface
21    Adafruit invests time and resources providing this open source code, 
22    please support Adafruit and open-source hardware by purchasing 
23    products from Adafruit!
24  
25    Written by Limor Fried/Ladyada for Adafruit in any redistribution
26   ****************************************************/
27  
28  #include <Adafruit_MLX90614.h>
29  #include <Adafruit_NeoPixel.h>
30  
31  // change these to adjust the range of temperatures you want to measure 
32  // (these are in Farenheit)
33  #define COLDTEMP 60
34  #define HOTTEMP  80
35  
36  
37  #define PIN 1
38  Adafruit_NeoPixel strip = Adafruit_NeoPixel(24, PIN, NEO_GRB + NEO_KHZ800);
39  
40  Adafruit_MLX90614 mlx = Adafruit_MLX90614();
41  
42  void setup() {
43    mlx.begin();  
44    strip.begin();
45    strip.show(); // Initialize all pixels to 'off'
46  }
47  
48  void loop() {
49    uint8_t red, blue;
50    float temp = mlx.readObjectTempF();
51  
52    if (temp < COLDTEMP) temp = COLDTEMP;
53    if (temp > HOTTEMP) temp = HOTTEMP;
54  
55    // map temperature to red/blue color
56    // hotter temp -> more red
57    red = map(temp, COLDTEMP, HOTTEMP, 0, 255);  
58    // hotter temp -> less blue
59    blue = map(temp, COLDTEMP, HOTTEMP, 255, 0);  
60  
61    colorWipe(strip.Color(red, 0, blue), 0);
62    
63    delay(50); // can adjust this for faster/slower updates
64  }
65  
66  // Fill the dots one after the other with a color
67  void colorWipe(uint32_t c, uint8_t wait) {
68    for(uint16_t i=0; i<strip.numPixels(); i++) {
69        strip.setPixelColor(i, c);
70        strip.show();
71        delay(wait);
72    }
73  }