How to find right code?

Projects Programming
1

I'm going to use TMP36 for meassuring temperature with my Arduino Uno, and i also have relay like the one attached as image.

I want the relay to turn on my AC heater when temperature decreases under 15 degree celcius.

Can someone help med how find that code?

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2

Here's OP's pic:

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7zLrd.jpg1100×1100 103 KB

3

You probably won't "find" the right code; here's how to read the temperature sensor. Then just do an if / else based on the temperature and digitalWrite the relay control pin.

4

Thanks.

Bu where do i plase the "if/else digitalwrite" code inside TMP36 code?

Sorry... i'm really noob at this...

5

add to the tmp36 example code with an if statement. Post your code so it is easier to help

6

Okay. Can do that later to day.

I just meant where in TMP36 code i should place the code for if statement and the relay. Is there a specific order?

7

Bjerknez:
Bu where do i plase the "if/else digitalwrite" code inside TMP36 code?

Have you had a dive into the linked code to try to follow it? (It's quite well commented...)

Where do you think it should go?

Bjerknez:
Is there a specific order?

(Hint: You need to have got to the stage where you know what the Celsius temperature is.)

(We were all noobs once: how long you stay a noob depends on how much you try to do it yourself :wink: )

8

What do you guys think about this code?

#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 5

int sensorPin=1
int relayPin=9

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

float Celcius=0;
float Fahrenheit=0;
void setup(void)
{

Serial.begin(9600);
sensors.begin();
pinMode(9, OUTPUT)
pinMode(1, INPUT)
}

void loop(void)
{
sensors.requestTemperatures();
Celcius=sensors.getTempCByIndex(0);
Fahrenheit=sensors.toFahrenheit(Celcius);
Serial.print(" C ");
Serial.print(Celcius);
Serial.print(" F ");
Serial.println(Fahrenheit);
delay(1000);

if (sensorPin > 18) {
digitalWrite(relayPin, LOW)
}

else (sensorPin < 14) {
digitalWrite(relayPin, HIGH)
}

9

I think you failed to read the instructions on how to post code and you are missing a closing } and the indentation is wrong but other than that it looks good.

10

if (sensorPin > 18) { You gave "sensorPin" the value 1.
How is it ever going to be greater than 18?

11

Wow!! I can't believe i did that with so little errors. Thanks :slight_smile:

And i'm really sorry i forgot to read the code guidelines.

12

Bjerknez:
I'm going to use TMP36 for meassuring temperature

But according to the link I gave, that sensor is just a simple analog sensor:

int reading = analogRead(sensorPin);

.... not a:

#include <OneWire.h>
#include <DallasTemperature.h>

... one.

13

I know. I changed the sensor to tmp36 and after a good our in my basement, i get it to work :slight_smile:

I got an led light up when temperature got to 18 degrees. I now understand how to merge the code with other codes. :slight_smile: