| Electronics > Beginners |
| Mosfet circuit with load indicator design question. |
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| GarySmith:
I'm working on a mosfet circuit for the hot bed on my 3d printer (24v). The mosfet circuit itself is actually pretty simple. I have that in place. What I want is create a sense circuit that will drive an LED when the hot bed element is passing current (i.e. working). I have looked at a few things and the solutions they have provided seem overly complex for what I'm looking to do (with little explanation) Any pointers on how I would go about this? I want to understand the process a little more (not just a simple diagram). |
| KC0PPH:
Can you just put a LED from the output of the mosfet through a resistor to ground? If not you could put a .1 ohm resistor in the +24V and measure the voltage drop across that with an OpAmp or current sense amp. |
| GarySmith:
Here is what I came up with. It's rough I know. https://imgur.com/a/LVvJ31o |
| MarkF:
Any reason you can't just put a LED and resistor across the load. |
| GarySmith:
The idea is that if the load dies (as in the case of my hot end element dying for example) the indicator would still show active. Right now it's an LED but ideally I would like the indicator (LED or whatever) to be a 5v digital value that I pump to a raspberry PI |
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