I have an Arduino board - the Uno 3 model. The output ground pin next to pin 13 seems to be damaged. The green light of Arduino glows fine. The orange LED also blinks. But when I insert an LED between 13 and ground, it does not glow. So I think the ground pin is damaged. What can I do now? Should I get another Arduino? Can I use any of the other output pins of Arduino as ground?

 

What can I do now? Should I get another Arduino?

Post a picture of the damaged pin.

Can I use any of the other output pins of Arduino as ground?

Not likely.

 

The ground pin on the controller? Which one?

 

Post a picture of the damaged pin.

Not likely.

The GND next to pin 13 is what I believe to be damaged. The green light and the orange LED are glowing as programmed. But....

 

Post a picture of the damaged pin.

Not likely.

The pin GND is what I think is damaged. The green light and orange LED still glows. But


The blue LED does not glow when connected to ground and pin 13. It used to glow earlier. To be led is fine and not damaged.

 

hi D,
Connect a insulated link wire, from the pin next to #13, on the back of the PCB from the Gnd pins on the other side of the PCB, it a common Gnd track.
E

EDIT:
In your last image, you appear to have no series resistor with the Blue LED, you may have blown the AVR output pin.
Unplug the LED and check the state of the Pin.

 

hi D,
This is a clip from the UNO circuit.
If you get a problem with the Gnd pin next to pin#13, you could use the ICSP #pin#6 Gnd as a fix.

Note pin #13 is connected directly to an AVR I/O pin.
E

 

hi D,
Connect a insulated link wire, from the pin next to #13, on the back of the PCB from the Gnd pins on the other side of the PCB, it a common Gnd track.
E


Right now, I don't have the materials to solder it. So I just connected the ground from one to another and the light glowed! Thanks for the help

 

hi,
That's good.
Always have a current limiting resistor in series with an LED.
E

 

Also do you have the polarity of the LED correct ?

Les.

 

hi D,
This is a clip from the UNO circuit.
If you get a problem with the Gnd pin next to pin#13, you could use the ICSP #pin#6 Gnd as a fix.

Note pin #13 is connected directly to an AVR I/O pin.
E

Now its not working

 

Not working again. Multimeter shows just 0.03 volts at the output of pin 13 and ground

 

Not working again. Multimeter shows just 0.03 volts at the output of pin 13 and ground

hi D,
Did you add a series resistor to the LED, the MCU I/O pin may be damaged and it fails when hot.
E

EDIT:
For a Blue LED at approx 15mA, a 150R resistor will be OK.

 

Post deleted.

 

Feeling curious about 13 pin's built-in LED (marked L LED) on UNO board.

It's permanently fixed with 13th pin. But we use the 13th for many purpose during many projects. Won't it affect to many types of signal output from the 13th pin? Because it has an unnecessary (in the case of many projects) series resistors and a LED always as a load.
Chinese clone of UNO do not have the built-in LED at 13th pin. Just has empty pads for LED and resistor.

 

Post deleted.

Huh? You mean I deleted your post? (I didn't, at least not intentionally. )

 

Feeling curious about 13 pin's built-in LED (marked L LED) on UNO board.

It's permanently fixed with 13th pin. But we use the 13th for many purpose during many projects. Won't it affect to many types of signal output from the 13th pin? Because it has an unnecessary (in the case of many projects) series resistors and a LED always as a load.
Chinese clone of UNO do not have the built-in LED at 13th pin. Just has empty pads for LED and resistor.

What other pin can I use? I need to give a PWM signal and blink the LED as per the frequency.

 

What other pin can I use? I need to give a PWM signal and blink the LED as per the frequency.

Any pin capable of PWM can be used to control an LED like you want..
Per the arduino website for the UNO..

• PWM: pins 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.

 

Any pin capable of PWM can be used to control an LED like you want..
Per the arduino website for the UNO..

• PWM: pins 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.

Now I am not even able to upload any programs to the arduino. Some major problem. How can I identify the real problem?

 

You mean I deleted your post?

No: I deleted it, having re-read other members' responses.