Can I open a circuit with a IRF520 MOSFET? Needs to be closed with no power

Other Hardware Motors, Mechanics, Power and CNC
1

Hey there

I have an Arduino running from a USB battery pack. This battery pack has a button I have to push in order to turn it on. I want to be able to to turn off everything completely through a switch. My plan:

  1. Adding a toggle switch between the battery pack electronics and the battery itself
  2. Closing the 'button-circuit' from the battery pack (always)
  3. Open the 'button-circuit' through arduino with a NC (normally closed) relay or – if possible – IRF520 MOSFET

This would imitate a constant push on the button, which will only be affective when the battery pack electronics get power (toggle switch). And it would 'stop pushing the button' as soon as the Arduino is running.

Since I don't have a NC relay module here, I would like to know if there is any other easy component to do that or if this can be achieved with a IRF520 MOSFET.

Hope my explanation is clear … it's not that easy. Thanks so much for your help.

Jonas

2

A MOSFET is normally used to connect a powered device to ground. If the switch on the battery pack is connected to the ground of the battery then you may have a problem. I expect that it might be possible to use a pullup resistor to hold the switch "on" and then use the MOSFET to pull that down when you want "OFF".

Datasheet? Photo of the battery and switch? Circuit diagram for the switch connections?

3

Hi,

I have an Arduino running from a USB battery pack. This battery pack has a button I have to push in order to turn it on.

What do you do with the existing system to turn it OFF?

Tom.... :slight_smile:

4

Depletion mode