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#### ktalebian

##### Jun 10, 2011, 08:16 pm
Hi there,

I need to read an analog signal that operates from 0-10V. Arduino Uno only accepts 0-5V. Is there another board that I could use to cover the range? Or is my only option to use two analog inputs?

Thanks

#### RuggedCircuits

#1
##### Jun 10, 2011, 08:18 pm
You can just divide your 0V-10V signal down to 0V-5V using a voltage divider:

http://en.wikipedia.org/wiki/Voltage_divider

--
The Ruggeduino: compatible with Arduino UNO, 24V operation, all I/O's fused and protected

#### Grumpy_Mike

#2
##### Jun 11, 2011, 11:44 pm
Quote

That is not an option at all from what I can see. How would you propose to do that?

#### MarkT

#3
##### Jun 12, 2011, 03:59 am

Quote

That is not an option at all from what I can see. How would you propose to do that?

By being 'creative'?  Subtract 5V with a floating voltage source and then measure the resultant +/-5V differentially between two analog pins (again floating loosely)
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#### retrolefty

#4
##### Jun 12, 2011, 04:04 am
Quote
By being 'creative'?  Subtract 5V with a floating voltage source and then measure the resultant +/-5V differentially between two analog pins (again floating loosely)

Arduino analog input pins are single ended and ground referenced. Can you provide a drawing showing your 'creative solution?

Lefty

#### MarkT

#5
##### Jun 13, 2011, 12:59 am
Think of a 'bridge tied load' output circuit and then think of it as an input circuit rather than output - you need some trick to hold the mean voltage of the +/-5V signal at 2.5V - basically this relies on the signal being measured being floating w.r.t. Arduino.   And then you need a 5.0V battery to subtract that 5V offset!
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#### retrolefty

#6
##### Jun 13, 2011, 01:40 am

Think of a 'bridge tied load' output circuit and then think of it as an input circuit rather than output - you need some trick to hold the mean voltage of the +/-5V signal at 2.5V - basically this relies on the signal being measured being floating w.r.t. Arduino.   And then you need a 5.0V battery to subtract that 5V offset!

That sure sounds like a foxtrot uniform solution.

#### MarkT

#7
##### Jun 13, 2011, 02:06 am
Compared to two 10k resistors, yes!
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#### Grumpy_Mike

#8
##### Jun 13, 2011, 06:32 am
Quote
And then you need a 5.0V battery to subtract that 5V offset!

Seen many 5v batteries then?

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