Control 12vLED using arduino UNO and LED amp

Projects General Guidance
1

Im trying to control a 12v led array with my arduino.
I have an 12v power supply powering the arduino and the LEDs.
I have it wired as shown in the diagram that I have attached, but when I turn on the power supply and the Arduino with the blink example running, the led just stays on. The only way the led turns off is by disconnecting the wires going from the arduino to the amp. Am I missing something here? is there a special coding that I need to have running on the arduino?

Im only using the blink example as a quick way to get this to work.
My goal here is to eventually use an encoder to control the intensity of the LEDs.

LED Amp.png
LED Amp.png1172×936 107 KB

wiring diagram.jpg
wiring diagram.jpg1952×699 196 KB

2

What diagram? You have a photo of the amplifier but no schematic....

3

Hi, what is written on the red/black pair that is being obscured by the front pair on the input?
Do you have a connection sheet that came with it?
Also a copy of your sketch please.
Tom...... :slight_smile:

4

The label on the led amp says power supply. I have the two wires going to the V+ and V- out of the external power supply.

Ill try attaching the wiring diagram again.

Here is the LED amp I got

Here is the LED array im trying to control

wiring diagram.jpg
wiring diagram.jpg1952×699 196 KB

5

[wild guess]
Maybe the 2 wires from the Arduino are wrong. I would have been inclined to put pin13 on the + input, and the - input to Arduino ground.
[/wild guess]