Pin 13 on board LED very dim

Other Hardware LEDs and Multiplexing
1

the on board LED from pin 13 on the UNO is very dim. Is there a reason for this and can I make it brighter

2

Can you provide more details on what your trying to accomplish or is this just a general issue with your board?

3

Set pin 13 as an output in the setup function, using the pinMode() call.

4

RodneyB:
the on board LED from pin 13 on the UNO is very dim. Is there a reason for this and can I make it brighter

  1. Uploading a blinky sketch from example to blink the LED 13.
  2. Now if the LED 13 is dim, try connecting pin 13 to another LED and a 300 Ohm resistor to the ground . If another LED is bright, the led on board is problem. If another LED is still dim, your board might be problem.
5

Here is my code

int LEDpin=12; 
int LEDpin2=13; 
int LEDpin1=11;
void setup() 
{
  
  
  pinMode(LEDpin, OUTPUT); //set the digital I/O pin to OUTPUT mode

}

void loop() 
{
  // void loop()  {
  digitalWrite(LEDpin, HIGH);   
  delay(1000);                  
  digitalWrite(LEDpin, LOW);   
  delay(1000);                  
  digitalWrite(LEDpin2, HIGH);   
  delay(1000);                  
  digitalWrite(LEDpin2, LOW);   
  delay(1000);                 
  digitalWrite(LEDpin1, HIGH);  
  delay(1000);
  digitalWrite(LEDpin1, LOW);  
  delay(1000);
  
}
6

An output pin needs to be made an output.

pinMode(LEDpin2, OUTPUT) ; //set the digital I/O pin to OUTPUT mode
pinMode(LEDpin, OUTPUT) ; //set the digital I/O pin to OUTPUT mode
pinMode(ledpin1, OUTPUT) ; //set the digital I/O pin to OUTPUT mode

.

7

Just like I told you in reply #2 without seeing the code. So why have you ignored what I said? There is no point in asking for advice if you are going to ignore the answer.

8

Grumpy_Mike:
Just like I told you in reply #2 without seeing the code. So why have you ignored what I said? There is no point in asking for advice if you are going to ignore the answer.

I didnt ignore your answer, I took your advice and then posted it working, so anyone who had a similar problem would see the corrected answer.

I even gave you Karma points so asking and answering and taking advice all included and acknowledged

9

The code you posted would not have worked because you did not set pin 13 to be an output.

10

Grumpy_Mike:
Just like I told you in reply #2 without seeing the code. So why have you ignored what I said? There is no point in asking for advice if you are going to ignore the answer.

The corrected code sorry miss post

int LEDpin13=13; //select a digital I/O pin
int LEDpin12=12; //select a digital I/O pin

void setup() {

pinMode(LEDpin13, OUTPUT);//set the digital I/O pin to OUTPUT mode
pinMode(LEDpin12, OUTPUT);//set the digital I/O pin to OUTPUT mode

}

void loop() {

digitalWrite(LEDpin13, HIGH);
delay(1000);
digitalWrite(LEDpin13, LOW);
delay(1000);
digitalWrite(LEDpin12, HIGH);
delay(1000);
digitalWrite(LEDpin12, LOW);
delay(1000);
}

11

Thanks, much better. :slight_smile:

12

RodneyB:
The corrected code sorry miss post

Have you got a spare board?

If your spare board has a bright led using the same code..... then you'll know the problem will be the led.