Hi,
I checked the signal from the Arduino at A and it is a good 20% duty signal. But between B and C it's a weak noisy wave, not resembling the signal at all.
The gate has clear connection labels, and I followed them all, and checked the 12v input and ground.
What could be going wrong?
Thanks
Always show us a good schematic of your proposed circuit.
Show us good images of your ‘actual’ wiring.
Give links to components.
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DC 5V-36V 1 5A(Max 30A) 400W Dual High-
Power MOSFET Trigger Switch Drive Module 0-
20KHz PWM Adjustment Electronic Switch Control
Board Motor Speed Control Lamp Brightness
https://www.amazon.com/gp/aw/d/B07NWD8W26?psc=1&ref=ppx_pop_mob_b_asin_image
- In the Arduino IDE, use Ctrl T or CMD T to format your code then copy the complete sketch.
Use the < CODE / > icon from the ‘posting menu’ to attach the copied sketch.
What do you have connected to points B and C?
All we can see in the photo is a pair of wires disappearing off to the top left hand side.
A disconnected plug. Ei. nothing.
You need to have a load of some sort connected between B and C to get meaningful results.
Have you got a resistor, say 1kΩ that you can connect between B and C?
The drain of the MOSFET won't go high unless there is something to pull it up towards 12V.
What you are seeing is likely to be a signal leaking from the gate to drain of the MOSFET.
That worked. Nice square signal that matches the Arduino.
You can tell I'm a noob. Thanks all!
Glad to here that you have got it working.
Because the MOSFET inverts the 20% duty cycle should look like an 80% duty cycle at point B.
I notice that you tried to quote my post in your reply.
If you try and quote the whole post, then the forum software removes it completely.
The trick is to just quote some of the reply, and not all of it. (As I did).
I spotted that this had happened because your reply was marked as having being edited.
Thanks. I'm so worn out by the time I drag my problem here, I didn't even notice the quote anomaly, and your explanation of it will definitely help in the future.
Yeah, I noticed you can go two ways with the duty cycle.
I realized that when I was planning a common chasis ground, and realized THAT'S NOT GOING TO HAPPEN! lol
But this has been real fascinating. Looks like these MOSFET trigger/gates will be OK, although they are capable of so much more amps.
Thanks again for the help!
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