Show Posts
Pages: [1]
1  Products / Arduino Due / Re: Solution for the 5V vs 3.3V problem on: March 25, 2013, 09:58:48 am
Looks like i'm using a voltage divider....Thanks Rob for your help.
2  Products / Arduino Due / Re: Solution for the 5V vs 3.3V problem on: March 22, 2013, 10:42:57 am
I posted the question of how I can convert my 5 volt output from the hall effect sensors to a 3.3 volt output that the due can read.  I posted this in another forum.

I've been looking at these low voltage translators and I don't think I can use these. 

I want the 3.3 volts to change linearly as the 5 volt changes...ie when I am getting 2.5 volts from the sensor the arduino should be reading 1.65 volts.

I'm not sure if I should just use a voltage divider because I'm concerned with accuracy to a certain degree.

Could you please help me out...this is for my senior design project.
3  Products / Arduino Due / Interfacing Hall-Effect current sensor with Due? on: March 21, 2013, 01:39:04 pm
Hello,

I am in the middle of my senior design project which is only a current measurement device capable of measuring current accurately from .5mA up to 20 A.  I decided to go with using several different sizes of hall-effect sensors and switching between them based on the incoming current.  I decided to go with using an Arduino Due because of the simplicity that the DAC pins give me.

Well, now that you know a little about my project, the issue I am having is that all of the current sensors output 5 volts analog and the Due can only read 3.3 volts.  I've found that the Aref pin is unable to used on the due.  I also don't feel like just using a voltage divider will give me the accuracy that I want.

My question is...is there a quick and nerdy, yet accurate way to read these 5 volt analog signals with my Due.  If this is really easy to solve, just remember I'm still a student and unaware of a lot of the shelf technology that's out there.
Pages: [1]