Timeline for MOSFET: Cannot control gate signal using Arduino PWM
Current License: CC BY-SA 4.0
7 events
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| Dec 30, 2020 at 10:20 | comment | added | user57037 | I would not expect it to work reliably. Ground in this context just means connected together. The point of the circuit that is defined to be 0V must be connected together for the MOSFET to work properly. Using some piece of earth or a floor in a house or whatever as a conductor in your circuit is unwise. If you need two circuits to have a common ground, run a wire between them. | |
| Dec 30, 2020 at 10:11 | comment | added | user2305193 | @mkeith Here's a doubt I'm having: if instead my mosfet driver battery would be something that is grounded simply with 'a wire to the ground (=physical floor)', and the USB of the arduino would also just be 'a wire to the ground (physical floor, 2-100m away)' - would you expect this to work? | |
| Dec 30, 2020 at 10:07 | comment | added | user57037 | @user2305193 yeah the mosfet is controlled by the voltage from gate to source. This means you have to connect the source to ground and the gate to your IO pin or it won't work. In a sense, if you don't connect the grounds of the two circuits together, the mosfet doesn't really feel the voltage at the gate. When you ground the source, it is forced to feel it. | |
| Dec 30, 2020 at 0:38 | vote | accept | user2305193 | ||
| Dec 30, 2020 at 0:37 | vote | accept | user2305193 | ||
| Dec 30, 2020 at 0:37 | |||||
| Dec 30, 2020 at 0:36 | comment | added | user2305193 | Connecting the two ground wires of the circuits worked, almost magical to see that LED shine with immediate commands of micropython. Thanks! This answer didn't really explain a lot, but I'm guessing that just means it's too trivial to explain, I'll read more about basic circuits | |
| Dec 30, 2020 at 0:25 | history | answered | Elliot Alderson | CC BY-SA 4.0 |