TMP36-Guide.pdf

CIRC-10

.:Temperature:.

.:TMP36 Precision Temperature Sensor:.

Code (no need to type everything in just)

CIRC-10

Download the Code from ( http://tinyurl.com/dfj8rs)

(copy the text and paste it into an empty Arduino Sketch)

/* ---------------------------------------------

* | Arduino Experimentation Kit Example Code |

* | CIRC-10 .: Temperature :. |

* ---------------------------------------------

* A simple program to output the current temperature

* to the IDE's debug window

* For more details on this circuit:

* http://tinyurl.com/c89tvd */

//TMP36 Pin Variables

int temperaturePin = 0;//the analog pin the TMP36's

//Vout pin is connected to

//the resolution is

//10 mV / degree centigrade

//(500 mV offset) to make

//negative temperatures an option

What We’re Doing:

{

float temperature =

getVoltage(temperaturePin);

//getting the voltage reading from the

//temperature sensor

What's the next phenomena we will measure with our Arduino?

Temperature. To do this we'll use a rather complicated IC

(integrated circuit) hidden in a package identical to our

P2N2222AG transistors. It has three pins ground, signal and +5

volts, and is easy to use. It outputs 10 millivolts per degree centigrade

on the signal pin (to allow measuring temperatures below freezing there is a 500 mV offset

). To convert this from the digital value to degrees we will use some

of the Arduino's maths abilities. Then to display it we'll use one of the IDE's rather powerful

features, the debug window. We'll output the value over a serial connection to display on the

screen. Let's get to it.

One extra note, this circuit uses the Arduino IDE's serial monitor. To open this, first upload the

program then click the button which looks like a square with an antennae.

The TMP36 Ddatasheet:

http://tinyurl.com/plbx38

temperature = (temperature - .5) * 100;//converting from 10 mv

//per degree wit 500 mV

//degrees ((volatge - 500mV) times 100)

Serial.println(temperature); //printing the result

delay(1000);

offset to

//waiting a second

}

* getVoltage() - returns the voltage on the analog input

* defined by pin

float getVoltage(int pin){

return (analogRead(pin) * .004882814);//converting from a 0

//to 1024 digital range

// to 0 to 5 volts

//(each 1 reading equals ~ 5 millivolts

eg.

void setup()

{

25 C = 750 mV, 0 C = 500mV

Serial.begin(9600); //Start the serial connection

//with the copmuter

//to view the result open the

//serial monitor

//last button beneath the file

//bar (looks like a box with an

//antenae)

}

void loop()

// run over and over

again

Not Working? (3 things to try)

The Circuit:

Nothing Seems to Happen

This program has no outward

indication it is working. To see

the results you must open the

Arduino IDE's serial monitor.

(instructions on previous page)

Gibberish is Displayed

This happens because the serial

monitor is receiving data at a

different speed than expected.

To fix this, click the pull-down

box that reads "*** baud" and

change it to "9600 baud".

Temperature Value is

Unchanging.

Parts:

TMP36

Temperature Sensor

CIRC-10

Breadboard sheet

Try pinching the sensor with

your fingers to heat it up or

pressing a bag of ice against it

to cool it down.

2 Pin Header

Wire

Arduino

analog

pin 0

Schematic:

+5 volts

Making it Better

Outputting voltage:

This is a simple matter of changing one line. Our sensor

outputs 10mv per degree centigrade so to get voltage we

simply display the result of getVoltage().

delete the line temperature = (temperature - .5) * 100;

Outputting degrees Fahrenheit:

this first revert to the original code then change:

Serial.println(temperature);

---->

Serial.print(temperature);

Serial.println(" degrees centigrade");

+5v

signal

TMP36

(precision

temperature

sensor)

The change to the first line means when we next output it will

appear on the same line, then we add the informative text and

a new line.

gnd

the chip will have

TMP36 printed on it

gnd

(ground) (-)

Again this is a simple change requiring only math. to go

degrees C ----> degrees F we use the formula.

( F = C * 1.8) + 32 )

add the line

Changing the serial speed:

If you ever wish to output a lot of data over the serial line time

is of the essence. We are currently transmitting at 9600 baud

but much faster speeds are possible. To change this change

the line:

Upload the sketch turn on the serial monitor, then change the

speed from 9600 baud to 115200 baud in the pull down menu.

You are now transmitting data 12 times faster.

temperature =

(((temperature - .5) * 100)*1.8) + 32;

Serial.println(temperature);

The Internet

before

Serial.begin(9600); ----> Serial.begin(115200);

.:download:.

More informative output:

http://tinyurl.com/ctdjod

breadboard layout sheet

Lets add a message to the serial output to make what is

appearing in the Serial Monitor more informative. To do

.:view:.

assembling video

http://tinyurl.com/d85jyx

More, More, More:

More details, where to buy more parts, where to ask more questions.

http://tinyurl.com/c89tvd

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