How to Measure DC voltage with basic stamp

Archiver

I would like to be able to measure the voltage of the batteries on a robot like
a sumobot (using 12V 1.5A Li-ion Battery). And display the result in VB. using
the serial port for communications.

but first things first, how do I read a DC voltage into BS2??


Thanks in advance
Troy

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Archiver

Cheap way would be to use a transistor controlled by the Voltage. Then
connect the transistor collector to a capacitor, and use the rc time command
in the stamp. Wouldn't be linear, but a look up table would give you good
results.

If the Voltage is not within the correct range, some tweaking of resistor
values would be in order.

However, there are add-ons to the stamp which give it A/D capability, and
folks with code written for them.

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Original Message

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From: Troy Matzkow [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=cKEesoyNXhZrm9mGSFsOn7PoiJSWJFqQJCv7HNouU2RhI1rfdA1st2i-PmiaDRdKC-LY3epIbx-I0QOiKg]troy8oy@y...[/url
Sent: Thursday, April 08, 2004 12:25 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] How to Measure DC voltage with basic stamp


I would like to be able to measure the voltage of the batteries on a robot
like a sumobot (using 12V 1.5A Li-ion Battery). And display the result in
VB. using the serial port for communications.

but first things first, how do I read a DC voltage into BS2??


Thanks in advance
Troy

---

Find local movie times and trailers on Yahoo! Movies.


[noparse][[/noparse]Non-text portions of this message have been removed]



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Archiver

Hi Troy,

I have a fairly detailed tutorial on how to do that using RCtime
posted at this URL:
http://www.emesystems.com/BS2rct.htm#B_voltage

-- Tracy


>I would like to be able to measure the voltage of the batteries on a
>robot like a sumobot (using 12V 1.5A Li-ion Battery). And display
>the result in VB. using the serial port for communications.
>
>but first things first, how do I read a DC voltage into BS2??
>
>
>Thanks in advance
>Troy