Difference between revisions of "Temperature Sensor."
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Reauben Samson has made an incubator and we need to check if it is working. We used a digital thermometer,<br> | Reauben Samson has made an incubator and we need to check if it is working. We used a digital thermometer,<br> | ||
it gives us different readings after every 15 minutes and we concluded it does not work so now we are <br> | it gives us different readings after every 15 minutes and we concluded it does not work so now we are <br> | ||
| − | building a temperature sensor using the Arduino Uno board and LM35 temperature sensor.<br> | + | building a temperature sensor using the Arduino Uno board and LM35 temperature sensor. The main aim is to keep <br> |
| + | a constant temperature using a light bulb as our heat source. We will be using a CPU fan to cool down the light bulb <br> | ||
| + | and to keep the incubator at a certain threshold temperature. <br> | ||
| + | |||
| + | <br> | ||
| + | Parts list: | ||
| + | CPU fan | ||
| + | LED | ||
| + | Light bulb (230 VOLT, 75 WATTS) <br> | ||
| + | LM 35 (temperature sensor) <br> | ||
| + | Diode (2N3904 - E25) <br> | ||
| + | Relay (JQC-3F 6 VOLT) <br> | ||
| + | Wire <br> | ||
| + | Arduino Uno <br> | ||
| + | |||
| + | <br><br> | ||
| + | <B> Arduino Code LM 35 Temperature Sensor </B> | ||
| + | float tempC; // create variable to store the temperature in. | ||
| + | int tempPin = 0; // Attach vout to analog pin 0. | ||
| + | int led = 13; // attach led to pin 13. | ||
| + | int fan1 = 3; // attach base of transistor to digital pin 3. | ||
| + | int pos = 0; // create variable to store the position of the servo motor. | ||
| + | |||
| + | void setup() // Will execute once at the start of the code. | ||
| + | { | ||
| + | Serial.begin(9600); // opens serial port, sets data rate to 9600 bps | ||
| + | pinMode (led, OUTPUT); // sets the led pin 13 up as an output. | ||
| + | pinMode (fan1, OUTPUT); // sets the fan1 pin 3 up as an output. | ||
| + | |||
| + | } | ||
| + | |||
| + | void loop() // code here will continue to replay nutil powered off. | ||
| + | { | ||
| + | tempC = analogRead(tempPin); // read the analog value from the lm35 sensor. | ||
| + | tempC = (5.0 * tempC * 100.0)/1024.0; // convert the analog input to temperature in centigrade. | ||
| + | Serial.print((byte)tempC); // send the data to the computer. | ||
| + | |||
| + | if (tempC > 38) // creates bool expression for analyzation. if it evaluates to true, | ||
| + | { // the body of the if statement will execute. | ||
| + | |||
| + | digitalWrite (led, HIGH); // turns on led. | ||
| + | digitalWrite (fan1, HIGH); // turns on fan1. | ||
| + | |||
| + | } | ||
| + | else // if the if equation evaluates to false the else statement will execute. | ||
| + | { | ||
| + | |||
| + | digitalWrite (led, LOW); // turns off led. | ||
| + | digitalWrite (fan1, LOW); // turns off fan1. | ||
| + | |||
| + | } | ||
| + | delay(3000); // wait 3 seconds before redoing the loop. | ||
| + | } | ||
| + | </p> | ||
Revision as of 10:20, 13 April 2013
Reauben Samson has made an incubator and we need to check if it is working. We used a digital thermometer,
it gives us different readings after every 15 minutes and we concluded it does not work so now we are
building a temperature sensor using the Arduino Uno board and LM35 temperature sensor. The main aim is to keep
a constant temperature using a light bulb as our heat source. We will be using a CPU fan to cool down the light bulb
and to keep the incubator at a certain threshold temperature.
Parts list:
CPU fan
LED
Light bulb (230 VOLT, 75 WATTS)
LM 35 (temperature sensor)
Diode (2N3904 - E25)
Relay (JQC-3F 6 VOLT)
Wire
Arduino Uno
Arduino Code LM 35 Temperature Sensor
float tempC; // create variable to store the temperature in.
int tempPin = 0; // Attach vout to analog pin 0.
int led = 13; // attach led to pin 13.
int fan1 = 3; // attach base of transistor to digital pin 3.
int pos = 0; // create variable to store the position of the servo motor.
void setup() // Will execute once at the start of the code.
{
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
pinMode (led, OUTPUT); // sets the led pin 13 up as an output.
pinMode (fan1, OUTPUT); // sets the fan1 pin 3 up as an output.
}
void loop() // code here will continue to replay nutil powered off.
{
tempC = analogRead(tempPin); // read the analog value from the lm35 sensor.
tempC = (5.0 * tempC * 100.0)/1024.0; // convert the analog input to temperature in centigrade.
Serial.print((byte)tempC); // send the data to the computer.
if (tempC > 38) // creates bool expression for analyzation. if it evaluates to true,
{ // the body of the if statement will execute.
digitalWrite (led, HIGH); // turns on led.
digitalWrite (fan1, HIGH); // turns on fan1.
}
else // if the if equation evaluates to false the else statement will execute.
{
digitalWrite (led, LOW); // turns off led.
digitalWrite (fan1, LOW); // turns off fan1.
}
delay(3000); // wait 3 seconds before redoing the loop.
}
