If the led-strips do not show signs of life then you should provide information about them too. Your photo does not show much of how that is connected. Or even which ledstrips they are. I presume these are just leds in series or parallel. Or do they have more controlling wires going into them? It is also important to know how much current they draw from the 12 volt supply. We really need that data!
Infact not even the Mosfet boards are explained where you got them or what they are. After doing some “Sherlock-ing” I found a document about them:
Take away the PWM shield for a moment, and lets focus on testing if the led-strip and Mosfet-board to work on their own. In order for the mosfet to operate you need to connnect its signal pin to 5v or gnd from the arduino. Also gnd needs to be connected to gnd of the arduino. (does not matter which program is running, you only need it as a supply for the mostfet) . The signal input can be connected to 5 volt or gnd with a wire to test if the ledstrip lights up or goes out by manual action. You should not connect that to a output pin of the arduino or PWM shield. It only complicated the matter.
the wires are fixed but notting is working .
I measerd the voltage on the shield an this is ~5 volt between the grn and the vcc
Measure the voltage on the signal pin to GND instead. That is what causes the mosfet to conduct. With the suggestion above it should be 5 volt or 0 volt depending on being connected to 5v or Gnd. But if it was connected to the PWM signal output of the shield then this voltage is the one that is important to know. And the voltage across the ledstrips as a result.
Once you can verify that that is working then we can focus on the PWM shield, Arduino or the example program.
when i remove the shield and connect the ledstrips to the arduino it works correct
I have treid this examples but nothing is working .
mine leds are connected to the 12 v power unit of 10 A so that must be enough i Think.
the mosfat board has a 12v connection , connection for the led (a 5 v grd) an a signal connection this go to the schield connections
see picture
the led are DC 12 V BFL 5050- and I want to use 18 led on one mosfet you see that in the picture I will test this with two ledstrips so the power must be enough.
What is the voltage on the signal pin of the PWM shield? We need to know this! The image of the pwm shield is too blurry for me, but I think that switch is set to take voltage from the unconnected Vin of the arduino. So the PWM shield cannot function
sterretje:
We still don’t know what Sparkfun shield you are using.
Since Sparkfun only has 1 pwm shield currently and the picture matches what is on the product page I think it is narrowed down enough. Unless there are other board versions.