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Forum Index : Microcontroller and PC projects : switch on Pico via control pin on Pico

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asknik2022
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Joined: 26/03/2022
Location: United Kingdom
Posts: 92
Posted: 11:01am 09 May 2023
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If the Pico is powered by usb direct , can i connect an on off switch to one of the pins in order to turn the pico on or off

The same question would appply to an arduino nano

Is it possible?
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6101
Posted: 11:25am 09 May 2023
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Will
3V3EN Enable 3.3V regulator (low = off, high = enabled).
do what you want?

Jim
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phil99

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Joined: 11/02/2018
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Posted: 01:03pm 09 May 2023
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On the Arduino Nano there is no on/off pin as such but switching the Reset pin to ground shuts the chip down.
 
Volhout
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Joined: 05/03/2018
Location: Netherlands
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Posted: 01:08pm 09 May 2023
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Similar to the RUN pin on the pico...





Volhout
Edited 2023-05-09 23:11 by Volhout
PicomiteVGA PETSCII ROBOTS
 
Mixtel90

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Posted: 04:02pm 09 May 2023
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3V3EN is ideal. It is a genuine power on/off switch if you are using the on-board switching supply a it puts it into a low power mode and disables the output. It works upside down, of course. With 3V3EN connected to GND the power is off.
Mick

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Volhout
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Posted: 04:06pm 09 May 2023
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  Mixtel90 said  3V3EN is ideal. It is a genuine power on/off switch if you are using the on-board switching supply a it puts it into a low power mode and disables the output. It works upside down, of course. With 3V3EN connected to GND the power is off.


But you must make provisiones that peripherals cannot backpower the rp2040 through io lines.

Volhout
PicomiteVGA PETSCII ROBOTS
 
asknik2022
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Joined: 26/03/2022
Location: United Kingdom
Posts: 92
Posted: 04:55pm 09 May 2023
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So I just connect a switch between GND and 3V3EN
 
Mixtel90

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Posted: 05:18pm 09 May 2023
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As Volhout points out, it's fine if you are powering your external stuff from the PicoMite's 3V3 pin. It will all switch on and off together then. If it's powered from a different supply then it's not quite so straightforward. Apart from that, then yes. :)
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
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