MLX90614 If 102.5<x>105 light up an LED

Using Arduino Programming Questions
1

I am doing a project for my class and have wired and programmed the MLX90614 to display the value, but I want it so that if the value is withing a range of 102.5-106 degrees F it will send out a signal to light up an led. The only problem is I don't know how to program this into the board. I already have the library downloaded and from the research I did i'm supposed to make an IF statement or something.

2

I already have the library downloaded and from the research I did i'm supposed to make an IF statement or something.

So, what is the problem? An if statement is only marginally more difficult to type (correctly) than an assignment statement.

3

read this would be a good place to start.

4 
if (mlx.readObjectTempF > 102.5) {

Why does this readObjectTempF not look like the other one in your sketch?

Please use code tags when posting code

5 
digitalWrite(LED, :LOW);

I'm going to guess that the compiler wasn't too keen on that one.

Also all executable statements need to be inside a function.

To be blunt, you'd've saved us all a lot of time if you'd posted the error messages you're seeing

6

I never saw an error message... the thing I was having trouble with was making my idea actually happen. I don't know how to program it to light up the LED if the temperature were to be in the range of 102.5-105 degrees F (like am I using the right variables and statements)

7

So are you saying you haven't tried compiling the code yet?

8

How many more copies of this question am I going to have to delete?

DO NOT CROSS-POST, CROSS-POSTING WASTES TIME.

9

You can ask someone else to delete them for you - there's a control on every single post on the forum, labelled "Report to moderator".

10

You can read about how to write "if" statements here.

We highly recommend self-study!

11

No, what you posted does not make sense. Please go over the if statement material again, to see why.

12

Here I think this makes sense. I'm not getting any errors when compiled and this was what I came up with for my code after reading up. I'm trying to get it so when the value is >102.5 and <106. it lights up the led on pin 13. Sorry if it's frustrating

 int ledPin = 13;
 (ledPin, OUTPUT);      // sets the digital pin as output



 if (mlx.readObjectTempF() > 102.5 and mlx.readObjectTempF() < 106 ) {digitalWrite(13, HIGH);
 }
else {
  digitalWrite(13, LOW);
}

                // LED connected to digital pin 13





}
13

DO NOT DELETE EARLIER POSTS!

14 
 (ledPin, OUTPUT);      // sets the digital pin as output

No, it doesn't.

15

Fixed it up I believe.

#include <Wire.h>
#include <Adafruit_MLX90614.h>
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
int ledPin = 13;

void setup() {
  Serial.begin(9600);
   pinMode(ledPin, OUTPUT);  // declare LED as output

  Serial.println("Adafruit MLX90614 test");  

  mlx.begin();  
}

void loop() {
  Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempC()); 
  Serial.print("*C\tObject = "); Serial.print(mlx.readObjectTempC()); Serial.println("*C");
  Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempF()); 
  Serial.print("*F\tObject = "); Serial.print(mlx.readObjectTempF()); Serial.println("*F");

  Serial.println();
  
 
       



 if (mlx.readObjectTempF() > 102.5 and mlx.readObjectTempF() < 106 ) {digitalWrite(ledPin, HIGH);
 }
else {
  digitalWrite(ledPin, LOW);
}
16

Welp thanks for the help everyone. I got it to work on my own now with no problem at all.