Destroy led on pro mini

Other Hardware General Electronics
1

Good day I would like to know if you take a 9 volt battery connect the ground to the mini and touch the positive after resistor to the onboard led, Will it destroy the led only thanks in advance

2

5V should be more than enough to kill the LED and safe for rest of the board. 9V may kill rest of the board.

3

I don't know... I can think of a few possibilities...

  • The battery can't supply enough current to burn-up the LED. The LED forward voltage holds around 2V and nothing bad happens (except the battery drains extra-fast).

  • The LED blows & shorts-out. Voltage goes to zero, and there's no further damage (except for a drained battery).

  • The LED blows & opens. 9V is applied to the I/O pin but the Arduino survives.

  • The LED blows & opens. 9V is applied to the I/O pin and the Arduino dies.

4

I think it's time for you to buy a soldering iron. Something in the 20-40W range is good for electronics. The temperature-adjustable ones (with a box that sits on the bench with the controls on it) are not expensive any more and supremely useful for more than just soldering.

Buy some solder (leaded is easier than lead-free) and solder wick too.

It's often easier to desolder the LED's resistor rather than the LED itself. Just blob a lot of solder on top of it until you have both ends covered by the molten blob and sweep it sideways off its pads. Use the solder wick to soak up the excess. It will look really clean and nobody except you will know what you've done.

5

Thank you so 5 volt directly to led on pro mini 3.3 volt should also work

6

If your goal is to disable the LED and soldering is not a good option for you, I would suggest you crush the series resistor with a needle nose pliers.

Couple of reasons:

  1. it will ensure the circuit is open and not some parasitic value from over current to the LED.

  2. If some day you wish to re enable the LED, you just replace the resistor. I guess you could just replace the LED if you toasted it but the resistor is easier.

7

Hi removing the led is probably the best but pliers is better if you need speed am i correct

8

I would not sum up the advice so far like that. I would say you have been told to remove the resistor by soldering or crushing.

If it were me I would just put a dab of black paint over the LED.

In fact in my latest project where I used a pro Micro the LEDs were too bright so I covered them in white typing correction fluid do cut down the light a bit.

1 Like