Subject:
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Re: 100 sensors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 12 Mar 1997 19:59:50 GMT
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Original-From:
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rabbit <G-WEBB@STUDENTSstopspam.UIUC.EDU>
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Viewed:
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2433 times
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On Wed, 12 Mar 1997, MAR ERICSON wrote:
> What's a resitor ladder?
> Is there a textbook or something where I can get a schematic?
A resistor ladder is simply several resistors, connected in
series with a switch between each one. On the handyboard you would do
something like this:
VCC ---\/\/\/---\/\/\/---\/\/\/---\/\/\/----------
| | | | | |
\ SW1 \ SW2 \ SW3 \ SW4 \ SW5 |
\ \ \ \ \ |
| | | | | |
| | | | | |
SIG --------------------------------------| |
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GND ----------------------------------------------
SW1-4 are your switches or any other digital (here, on/off) device.
\/\/\/ are the resistors which can be just about any value as long as
they are all the same (unless you want a non linear response)
The idea is that the voltage drops by VCC/(# of resistors) after every
resistor. By putting a switch at each voltage drop you can get a as many
different voltages as you have resistors on your SIG (signal) lead. This
signal would go to the analog input of the handy board.
> Is is same as a D-A converter?
Yes this is a D-A converter.
Garth
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Message is in Reply To:
 | | Re: 100 sensors
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| What's a resitor ladder? Is there a textbook or something where I can get a schematic? Is is same as a D-A converter? ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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