Jonathan Eskow
Published

Indoor NeoPixel Thermometer 

An indoor thermometer with LCD and "analog" readouts.

IntermediateFull instructions provided10,923
Indoor NeoPixel Thermometer 

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
NeoPixel
×1
LCD readout
×1
TMP36 sensor
×1
Resistor 1k ohm
Resistor 1k ohm
×1
470 ohm resistor
×1
Rotary potentiometer (generic)
Rotary potentiometer (generic)
×1
Simple momentary switch
×1
F to M jumper wires
for the LCD
×1
M to M Jumpers
for everything else
×1
Breadboard (generic)
Breadboard (generic)
×1

Story

Read more

Code

file_9790.txt

C/C++
neoTemp.ino
#include <LiquidCrystal.h>
#include <Adafruit_NeoPixel.h>

// Create a variable that will store the temperature value
int TMPin = 0;
const int button = 12;
int lastColor = -1;


#define aref_voltage 3.3
#define PIN 6


/*
Param 1 == number of pixels
Param 2 == Arduino pin attached to din
Param 3 == pixel type flags, add together as needed
  NE0_KHZ800 800 KHZ bitstream (avg neopix)
  NE0_GRB wired for GRB bitstream
*/
Adafruit_NeoPixel strip = Adafruit_NeoPixel(32, PIN, NEO_GRB + NEO_KHZ800); //call Neopixels, 32 pixels in all, on pin 6, RGB system and 800 KHZ
LiquidCrystal lcd(13, 11, 5, 4, 3, 2); //call LCD display

void setup() 
{
  lcd.begin(16,2); //initialize LCD screen 16 by 2  
  strip.begin(); //begin neo pixel strip
  strip.show(); //initialize strip
  Serial.begin(9600);// serial monitor access
  pinMode(button, INPUT); //button for celsius
  analogReference(EXTERNAL); //analog reference for use with TMP36
}

void loop() 
{
  double temperature;
  double temp;
  double tempF;


  temp = tempMeasure(temperature); //call tempMeasure function
  tempF = (temp * 9.0/5.0 + 32);  //take reading from tempMeasure and convert to faharenheit
  
  
  while(digitalRead(button) == false) //button is depressed readout is in Celsius
  {
    Serial.println(temp); //prints in serial monitor
    lcd.print(temp); //prints on LCD screen
    lcd.setCursor(0,1); //sets cursor
    delay(2000); //2 seconds between readings
    lcd.clear(); //clear LCD after 2 seconds   
}
 
 pixelCaseF(tempF); //call pixelCase function that controls lights
 Serial.println(tempF); //print in serial
 lcd.print(tempF); //print temp in F on LCD
 lcd.setCursor(0,1); //set cursor
 delay(2000); //take reading every 2 seconds
 lcd.clear(); //clear LCD
 
}//end loop


double tempMeasure(double temperature)
{
 // -----------------
// Read temperature
// -----------------

  int reading = analogRead(TMPin); //voltage reading
  double voltage = reading * aref_voltage; //take initial reading and multiply by 3.3 ref voltage for arduino
  
  voltage /= 1024.0; //divide reading by 1024 to map
   
  temperature = (voltage - 0.5) * 100; //converts 10mv per degree with 500 mV offset to (voltage - 500mV) * 100)
   
  return temperature; //return temperature to top level method

}//end tempMeasure

void pixelCaseF(double tempF)
/*
This method controls the neo-pixel for the "analog" readout on the thermometer. With every temperature group, the number of pixels lit changes along with the color
*/

{
 int i;
 strip.setBrightness(64);
 strip.show();
  
  if (tempF >= 90.05)//if above 90 degrees, strip is red and entire strip is lit
 {
   strip.clear();
   for(int i=0;i <= 32;i++)
   {
   strip.setPixelColor(i, strip.Color(255,0,0));
   }
 }
 else if (tempF < 90.2 && tempF >= 80.05) //if 90 > tempF >= 80 orange and strip is partially lit up to 29th pixel
 { 
   strip.clear();
   for(int i=0;i <= 28;i++)
  {
  strip.setPixelColor(i, strip.Color(255,128,0)); 
  }
 }
 else if (tempF < 80.02 && tempF >= 70.5)// if 80 > tempF >= 70 yellow-green and strip is lit up to 25th pixel
 {
   strip.clear();
   for(int i = 0; i <= 24; i++)
   {
    strip.setPixelColor(i,strip.Color(204,255,0)); 
   }
 }  
 else if (tempF < 70 && tempF >= 60.5)// if 70 > tempF >= 60 green and strip is lit up to 21st pixel
{
  strip.clear();
  for(int i = 0; i<= 20; i++)
  {
   strip.setPixelColor(i,strip.Color(0,255,0));
  }
}
 else if (tempF < 60.02 && tempF >= 50.5) //if 60 > tempF >= 50 blue and strip is lit up to 17th pixel
{
  strip.clear();
  for(int i = 0; i <= 16; i++)
  {
    strip.setPixelColor(i,strip.Color(0,0,255));
  }
} 
 else if (tempF < 50.02 && tempF >= 40.5) //if 50 > tempF >= 40 aqua and strip is lit to 13th pixel
 {
   strip.clear();
   for(int i = 0; i <= 12; i++)
  {
   strip.setPixelColor(i, strip.Color(0,255,255));
  }
 }
 else if (tempF < 40.02 && tempF >= 32.5) //if 40 > tempF >= 32 fuschia and strip is lit to 9th pixel
 {
   strip.clear();
   for(int i = 0; i <= 8; i++)
  {
   strip.setPixelColor(i, strip.Color(153, 51,255)); 
  }
 }
 else if (tempF < 32.5) //temp < freezing white and strip is lit to 5th pixel
 {
   strip.clear();
   for(i = 0;i <= 4; i++)
 { 
   strip.setPixelColor(i, strip.Color(255,255,255)); 
 }//end for
 }
 
strip.show(); //update color change

}//end pixelCase

Github

https://github.com/adafruit/Adafruit_NeoPixel

Credits

Jonathan Eskow

Jonathan Eskow

5 projects • 18 followers
Electronics Engineer at NextFab and ECE undergrad at Temple University

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