monitering amps and voltage
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Posts: 46,084
I am very new to the electronics and microcontroller world. I have a need
to measure and output to an lcd screen the amps and voltage of a certain
machine.
The amps range from 0 - 40 and voltage from 0 - 300. I have a basic stamp
and board of education. I was wondering how to convert these measurements
from analog to digital and output them. Is it possible to do this with the
basic2 stamp and what other components will I need? Any help is greatly
appreciated...
Jason
to measure and output to an lcd screen the amps and voltage of a certain
machine.
The amps range from 0 - 40 and voltage from 0 - 300. I have a basic stamp
and board of education. I was wondering how to convert these measurements
from analog to digital and output them. Is it possible to do this with the
basic2 stamp and what other components will I need? Any help is greatly
appreciated...
Jason
Comments
easiest.
To measure current use a shunt which is basically a small resistance inserted in
series with the circuit. By measuring the voltage drop across the shunt that
will tell you how much current is flowing.
For your ADC use the LTC1298, parallax has documented the interface to the stamp
and it is pretty easy to work with
Good Luck
-=Randy Knutson
miller wrote:
I am very new to the electronics and microcontroller world. I have a need
to measure and output to an lcd screen the amps and voltage of a certain
machine.
The amps range from 0 - 40 and voltage from 0 - 300. I have a basic stamp
and board of education. I was wondering how to convert these measurements
from analog to digital and output them. Is it possible to do this with the
basic2 stamp and what other components will I need? Any help is greatly
appreciated...
Jason
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or DC and if they are AC what frequency? What resolution do you need?
[noparse][[/noparse]Non-text portions of this message have been removed]
I like the MCP3202 two channel A2D chip. Its also SPIish (three wire
serial) but only costs about $3 instead of $10. I've used this chip
successfully bit-banging it with a 90S2313. Another inexpensive A2D
three-wire chip is the ADC0832, and Parallax even has an appnote on
using this with the Stamp I, so using it with the Stamp II is a skate.
The ADC0834 which is the 14 pin 4 line converter, is only $2.75 at
http://www.phanderson.com .
When measuring current you need a VERY small resistor and for
that range of current (0-40 amps is REALLY large spread) you are
going to need an amplifier to boost the voltage reading. The
voltage is easy, use a voltage divider to make 300V look like 3V. You
lose resolution, but you can cover the range.
We'd need more information to better answer the question.
DLC
--- In basicstamps@y..., miller <miller12@r...> wrote:
>
> I am very new to the electronics and microcontroller world. I have a need
> to measure and output to an lcd screen the amps and voltage of a certain
> machine.
> The amps range from 0 - 40 and voltage from 0 - 300. I have a basic stamp
> and board of education. I was wondering how to convert these measurements
> from analog to digital and output them. Is it possible to do this with the
> basic2 stamp and what other components will I need? Any help is greatly
> appreciated...
>
> Jason