I am trying to make the Arduino Nano BLE to control power of my motor ESC.
The idea is to only allow motor to be operated when Arduino sees a Bluetooth tag and providing the enable signal.
The supply voltage is 60-82V DC.
The only available option is using P-Channel mosfet (I'd love to go with N-Channel, but in this case we'll have to deal with 300A instead of 30mA of a current due to a common ground)
So here is the circuit I've built.
Both NPN and P-Mosfet are ok with the voltage.
Max current for the FET is 2A (waaaay more then needed, load current is only 30ma)
Previously I tried BSS92 Mosfet. It was working for some time but then blew up
It should not be caused by the current, so I added a flyback diode (1N4004) in the new version.
And any way replaced the mosfet with more powerful one.
Now it's just does not work.
Maybe there's something wrong with my understanding of the schema or maybe resistor nominals are wrong (I chose 43K resistor to minimize the current flowing through the resistor and NPN to avoid overheating)
So am I right that can't just ground it's gate?
And I need to provide it with voltage which is 20V lower than supply voltage?
If yes- I guess voltage devider would do the trick?
With additional resistor between NPN's collector and FET's Gate
Could you please post some simple schematics of emitter follower solution?
And zener would be also useful (i found some examples, but not sure if it's correct in my case)
