Esplora example: read temperature sensor

This example read and display temperature sensor of Arduino Esplora on TFT screen, in celsius and fahrenheit.

Read temperature sensor on Arduino Esplora

#include <TFT.h>
#include <SPI.h>
#include <Esplora.h>

int celsius = 0;
int fahrenheit = 0;
char printoutC[3];
char printoutF[3];

void setup()
{
    EsploraTFT.begin();
    EsploraTFT.background(0,0,0);
    
    //preset dummy reading to print
    String dummy = "0";
    dummy.toCharArray(printoutC, 3);
    dummy.toCharArray(printoutC, 3);
    
    EsploraTFT.stroke(255,255,255);
    EsploraTFT.text("degree C: ", 0, 10);
    EsploraTFT.text("degree F: ", 0, 20);
} 

void loop()
{
    //read the temperature sensor
    celsius = Esplora.readTemperature(DEGREES_C);  
    fahrenheit = Esplora.readTemperature(DEGREES_F);

    //clear previous print of reading
    EsploraTFT.stroke(0,0,0);
    EsploraTFT.text(printoutC, 60, 10);
    EsploraTFT.text(printoutF, 60, 20);
    
    String(celsius).toCharArray(printoutC,3);
    String(fahrenheit).toCharArray(printoutF,3);
    EsploraTFT.stroke(255,255,255);
    EsploraTFT.text(printoutC, 60, 10);
    EsploraTFT.text(printoutF, 60, 20);

    delay(1000);
}

Example of Timer Interrupt on Arduino

It's example to use Timer Interrupt of Arduino Esplora, to toggle RGB LED when timer interrupt reached.



testTimer.ino

#include <Esplora.h>

volatile boolean ledon;
volatile unsigned long lasttime;
volatile unsigned long now;
 
void setup() {
    ledon = true;
    Esplora.writeRGB(100, 100, 100);

    lasttime = millis();
    
    // initialize Timer1
    noInterrupts(); // disable all interrupts
    TCCR1A = 0;
    TCCR1B = 0;

    TCNT1 = 34286; // preload timer 65536-16MHz/256/2Hz
    TCCR1B |= (1 << CS12); // 256 prescaler
    TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt
    interrupts(); // enable all interrupts
    
}
 
void loop() {
 
}

ISR(TIMER1_OVF_vect)
{
    TCNT1 = 34286; // preload timer
    
    ledon = !ledon;
    if(ledon){
        Esplora.writeRGB(0, 0, 1);
    }else{
        Esplora.writeRGB(0, 0, 0);
    }
    
    now = millis();
    Serial.println(now - lasttime);
    lasttime = now;
}

reference: http://blog.oscarliang.net/arduino-timer-and-interrupt-tutorial/

Programming Arduino Uno with Simulink

Install the Arduino® support package, create a simple model, and download the model to Arduino Uno using a step-by-step workflow with Simulink®.

For more information, please visit, http://www.mathworks.com/hardware-support/arduino-simulink.html