Newbie to programming : Question on how to program temperature sensors

Projects Programming
1

I have to build a body temperature detection device that causes a buzzer to ring when the temperature of the skin has reached 38 degrees celsius. This device is meant to be worn around a child's arm, I was thinking of using an adafruit Trinket as a micro controller but am unsure as to how to go about programming there sensor to ring at a specific temperature of 38 degrees celsius. Can anyone give me some suggestions as o how to go about doing this ?

Thank you !

2

Hi,
See DS18B20 info here:

https://arduino-info.wikispaces.com/Brick-Temperature-DS18B20

3

am unsure as to how to go about programming there sensor to ring at a specific temperature of 38 degrees celsius.

You can't. The temperature sensor is NOT programmable. The Arduino, or something pretending to be an Arduino CAN be programmed.

4 
void loop ()
{
    float temperature = readTemperatureC();
    if (temperature >= 38.0)
    {
        digitalWrite(BuzzerPin, HIGH);
    }
    else
    {
        digitalWrite(BuzzerPin, LOW);
    }
}
5

Because HIGH==1==true and LOW==0==false that can be simplified to:

void loop ()
{
    digitalWrite(BuzzerPin, readTemperatureC() >= 38.0);
}
6

Thank you for your inputs!
Seeing that my device would have to be compact, I was intending to use an Adafruit Trinket - Mini Microcontroller - 5V Logic......
Would that be plausible ?
Whereby I could use a button battery ( the kind used for watches) as a peer source, connect the piezo buzzer and a temperature sensor onto that ?

7

Would that be plausible ?

Yes. Your proof-of-concept device does NOT have to be as small as the ultimate project, though, so get the programming squared away with the Arduino that you have now.