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Author Topic: potentiometer voltage  (Read 4479 times)

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Offline Bill_O

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potentiometer voltage
« on: March 05, 2009, 01:14:12 PM »
Can the voltage for pots be 5 instead of 3.3?
I want to use a hall effect joystick and they only work with 5.
Bill

Offline borisz

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Re: potentiometer voltage
« Reply #1 on: March 05, 2009, 01:24:50 PM »
It can be 5V, but it will measure only up to 3,3V.
Probaly it can be done with simple resistor divider.
What is the resistance of potentiometer?

regards

Boris
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope

Offline Bill_O

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Re: potentiometer voltage
« Reply #2 on: March 05, 2009, 02:25:39 PM »
Boris,
So if I use the 5v from the pokeys instead of the 3.3v it will not blow up my pokeys or pc?
Bill

Offline borisz

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Re: potentiometer voltage
« Reply #3 on: March 05, 2009, 03:01:06 PM »
It is limited to 5V, but it will measure only up to 3,3V.
If more than 5V e.g. 5,1V will be connected analog inputs will be blown.
For security reason, my opinion is that you shoud limit voltage to 3,3V. Please write more about your application and about your potentiometer and I will suggest you right solution.

regards

Boris
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope
Re: potentiometer voltage
« Reply #4 on: April 15, 2009, 11:26:40 AM »
Hi Borisz

Is it OK to use a separate supply of 3.3v for the pots

I use a PC power supply for my 5 & 12v but they also can supply 3.3v so this seems ideal ?

Thanks
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Offline borisz

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Re: potentiometer voltage
« Reply #5 on: April 15, 2009, 11:52:44 AM »
It should be OK.

regards

Boris
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope