EsploraTFTTemp

Check the temperature with the onboard sensor and display it on screen.

Esplora TFT Temperature Display

This example for the Esplora with an Arduino TFT screen reads the temperature with the onboard thermisistor, and prints it out on screen.

Hardware Required

  • Arduino Esplora

  • Arduino TFT screen

Circuit

Esplora GLCDTemp

Attach the TFT screen to the socket on your Esplora, with the label "SD Card" facing up.

Code

To use the screen you must first include the SPI and TFT libraries. Don't forget to include the Esplora library as well.

1#include <Esplora.h>
2#include <TFT.h>
3#include <SPI.h>

To update the screen with text, you'll need to store dynamic content in a char array.

char tempPrintout[3];

In

setup()
, initialize the screen and clear the background. Set the color for the font with
stroke()
, and write any static text to the screen. In this case, you'll write "Degrees in C :". This will stay at the top of the screen and not change as long as the sketch runs. Before entering the
loop()
, set the text size so you can really see the temperature stand out.

1void setup(void) {
2
3 EsploraTFT.begin();
4
5 EsploraTFT.background(0,0,0);
6
7 EsploraTFT.stroke(200,20,180);
8
9 EsploraTFT.setTextSize(2);
10
11 EsploraTFT.text("Degrees in C :\n ",0,0);
12
13 EsploraTFT.setTextSize(5);
14}

In

loop()
, read the temperature in Celsius with
Esplora.readTemperature(DEGREES_C)
, storing it in a string. Convert the string content to a char array, storing it in the global array you declared int he beginning of your program.

1void loop() {
2
3 String temperature = String(Esplora.readTemperature(DEGREES_C));
4
5 temperature.toCharArray(tempPrintout, 3);

Set the text color (this would be a good place to change the color of the text depending on the value from the thermometer), and print it to the screen below the static text.

1EsploraTFT.stroke(255,255,255);
2
3 EsploraTFT.text(tempPrintout, 0, 30);

Wait for one second, then erase the text you just wrote, so you can update it in the next run through

loop()
.

1delay(1000);
2
3 // erase the text for the next loop
4
5 EsploraTFT.stroke(0,0,0);
6
7 EsploraTFT.text(tempPrintout, 0, 30);
8}

The complete sketch is below :

1/*
2
3 Esplora TFT Temperature Display
4
5 This example for the Arduino TFT screen is for use
6
7 with an Arduino Esplora.
8
9 This example reads the temperature of the Esplora's
10
11 on board thermisistor and displays it on an attached
12
13 LCD screen, updating every second.
14
15 This example code is in the public domain.
16
17 Created 15 April 2013 by Scott Fitzgerald
18
19 http://www.arduino.cc/en/Tutorial/EsploraTFTTemp
20
21 */
22
23// include the necessary libraries
24#include <Esplora.h>
25#include <TFT.h> // Arduino LCD library
26#include <SPI.h>
27
28char tempPrintout[3]; // array to hold the temperature data
29
30void setup() {
31
32 // Put this line at the beginning of every sketch that uses the GLCD
33
34 EsploraTFT.begin();
35
36 // clear the screen with a black background
37
38 EsploraTFT.background(0, 0, 0);
39
40 // set the text color to magenta
41
42 EsploraTFT.stroke(200, 20, 180);
43
44 // set the text to size 2
45
46 EsploraTFT.setTextSize(2);
47
48 // start the text at the top left of the screen
49
50 // this text is going to remain static
51
52 EsploraTFT.text("Degrees in C :\n ", 0, 0);
53
54 // set the text in the loop to size 5
55
56 EsploraTFT.setTextSize(5);
57}
58
59void loop() {
60
61 // read the temperature in Celsius and store it in a String
62
63 String temperature = String(Esplora.readTemperature(DEGREES_C));
64
65 // convert the string to a char array
66
67 temperature.toCharArray(tempPrintout, 3);
68
69 // set the text color to white
70
71 EsploraTFT.stroke(255, 255, 255);
72
73 // print the temperature one line below the static text
74
75 EsploraTFT.text(tempPrintout, 0, 30);
76
77 delay(1000);
78
79 // erase the text for the next loop
80
81 EsploraTFT.stroke(0, 0, 0);
82
83 EsploraTFT.text(tempPrintout, 0, 30);
84}

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