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Topic: Need some help with MOSFET (Read 1 time) previous topic - next topic

Coding Badly


retrolefty


Chagrin


commanda


First of all a IRF510 will not operate properly with an arduino output pin because it is NOT a logic level mosfet. A logic level mosfet gate can be fully turned on with +5vdc, a non logic level mosfet requires => +10vdc to full turn on.

As far as your failure to turn off, I would want to see a wiring drawing of how you actually have things wired up before guessing. First impression is that 100K ohms is awful large to try and discharge the gate capacitance.


Lefty



If I'm understanding correctly, what you're trying to do is power off the Arduino, sending a control signal from the Arduino itself.
This will not work with an N-channel fet.  The Arduino ground is connected to the mosfet drain.  The Arduino output pin, when set to low, only goes to its own ground. So the mosfet gate is still at the same potential as the drain.

A P-channel mosfet in the positive supply line might work.

A better approach would be to investigate the sleep library.

Amanda

CrossRoads

GM, yeah had Mike on the brain from another post ...
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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