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Powerboost 1000C switch/sensor
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Powerboost 1000C switch/sensor

by Fireshark on Mon Oct 08, 2018 11:34 pm

Hi, I'm relatively new to this, and hit a snag of confusion.

For the Adafruit Powerboost 1000C, I'd like to switch the 5V power on and off using a hall sensor (US5881LUA).
I believe I can use this in some manner with the VS, EN and G pins, and a resistor.

What orientation do these pins need to be?
Would it be possible to make it such that when a magnet is nearby, the power is on?

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Re: Powerboost 1000C switch/sensor

by adafruit_support_mike on Wed Oct 10, 2018 1:59 am

Yep.. power the Hall effect sensor between Vs and GND, and connect the PowerBoost's En pin to the Hall sensor's output pin.

When the sensor detects a magnet, it will turn on its internal mosfet, pulling En to GND and disabling the PowerBoost's 5V output.

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Re: Powerboost 1000C switch/sensor

by Fireshark on Wed Oct 10, 2018 3:23 am

adafruit_support_mike wrote:Yep.. power the Hall effect sensor between Vs and GND, and connect the PowerBoost's En pin to the Hall sensor's output pin.

When the sensor detects a magnet, it will turn on its internal mosfet, pulling En to GND and disabling the PowerBoost's 5V output.


Hi Mike!
So the leftmost pin is VS, middle is GND, and the right 'listen' pin is to EN?

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Re: Powerboost 1000C switch/sensor

by adafruit_support_mike on Wed Oct 10, 2018 3:25 am

It depends on the orientation of the part.

The datasheet has a drawing and pinout table on page 3:

https://cdn-shop.adafruit.com/datasheet ... rev007.pdf

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Re: Powerboost 1000C switch/sensor

by Fireshark on Wed Oct 10, 2018 3:38 am

adafruit_support_mike wrote:It depends on the orientation of the part.

The datasheet has a drawing and pinout table on page 3:

https://cdn-shop.adafruit.com/datasheet ... rev007.pdf


Okay, I see it. It looks to be what I described, then with the UA part!
The hall sensor will only turn OFF the connection, right? It can't be used to do the opposite (when a magnet is near to turn things on).

Thank you for your advice.

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Re: Powerboost 1000C switch/sensor

by adafruit_support_mike on Thu Oct 11, 2018 3:51 am

That sensor will only pull EN low when a magnet is close.

There are other sensors which have the kind of output you want though. This one has complementary output, so one pin stays low until a magnet is nearby:

https://www.mouser.com/ProductDetail/Di ... GW1Q%3d%3d

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Re: Powerboost 1000C switch/sensor

by karxpava on Sat Dec 15, 2018 2:02 pm

In using a AH277AZ4-CG1 normally closed Hall effect sensor with the powerboost, would one also connect a 10k resistor between one of the output pins and VDD?

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Re: Powerboost 1000C switch/sensor

by adafruit_support_mike on Sun Dec 16, 2018 3:01 am

Yes. The outputs on that one are open-drain, and require a pull-up resistor.

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Re: Powerboost 1000C switch/sensor

by The_Feral_Child on Mon Jul 29, 2019 6:30 pm

Hi,
I would like to use the US1881 latching hall sensor to switch the PowerBoost 1000c on/off. I have drawn the attached diagram based on the previous posts in this thread and the information the manufacturer provided for a three-wire circuit for harsh environments because the device I am powering will be going underwater. Would this work?
Thanks,
Farrell
Attachments
US1881 Hall Sensor Switch for PowerBoost 1000C.png
US1881 Hall Sensor Switch for PowerBoost 1000C.png (10.59 KiB) Viewed 72 times

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Re: Powerboost 1000C switch/sensor

by adafruit_support_mike on Tue Jul 30, 2019 1:08 pm

D1, Z1, and R1 prevent voltage spikes large enough to damage the sensor, and probably won’t be necessary if you power the sensor from the LiPo. Other than that, the circuit looks okay.

For the sake of clarity, Rpu and C2 need to connect to the sensor’s output.

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Re: Powerboost 1000C switch/sensor

by The_Feral_Child on Tue Jul 30, 2019 3:00 pm

Mike,
Thank you for your reply, it is good to know that I do not need the extra components (D1,R1, and Z1).
Farrell

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Please be positive and constructive with your questions and comments.