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Digital display for pressure sensor help needed

I want to build a cuircut that will digitaly display air pressure
(0-200+ PSI) from 4 or 5 different sources on one small screen. Here
are my questions:

- Is this project feasible for someone with little knowledge of
electronics?

- Accuracy is not critical within a PSI or two would be fine. Would it
be simpler to use analog sending units or digital sensors?

- How would the cuircut work? Would it somehow take the signal from the
sensors and convert it to pounds per square inch and then send it to
something that would display that information on a LCD screen?

- What would be a rough estimate of the cost of this project?

Thank you,

Erik-
 
I want to build a cuircut that will digitaly display air pressure
(0-200+ PSI) from 4 or 5 different sources on one small screen. Here
are my questions:

- Is this project feasible for someone with little knowledge of
electronics?

- Accuracy is not critical within a PSI or two would be fine. Would it
be simpler to use analog sending units or digital sensors?

- How would the cuircut work? Would it somehow take the signal from the
sensors and convert it to pounds per square inch and then send it to
something that would display that information on a LCD screen?

- What would be a rough estimate of the cost of this project?

Thank you,

Erik-

No hope of a novice making it. Pressure sensors use a strain gauge in a
bridge circuit. Cost is difficult, If you bought it ready made I doubt
you have much change from $2000.
 
C

Chris

Jan 1, 1970
0
I want to build a cuircut that will digitaly display air pressure
(0-200+ PSI) from 4 or 5 different sources on one small screen. Here
are my questions:

- Is this project feasible for someone with little knowledge of
electronics?

- Accuracy is not critical within a PSI or two would be fine. Would it
be simpler to use analog sending units or digital sensors?

- How would the cuircut work? Would it somehow take the signal from the
sensors and convert it to pounds per square inch and then send it to
something that would display that information on a LCD screen?

- What would be a rough estimate of the cost of this project?

Thank you,

Erik-

Hi, Erik. If you're a newbie looking for low cost, your best bet might
be to put 2 or 3 rail-to-rail op amps on a perfboard to convert your
analog output signals from the sensors to a 0-200mV signal (if you'd
mentioned the sensor you might have gotten a sample circuit). You
could then use four or 5 ICL-7106- or ICL-7107-based LCD or
LED-7-segment 0-200mV input displays which would show the output in PSI
or whatever units you calibrated with the component values and tweaker
pots.

WAG cost estimate:
Regulated power supply: $10
Perfboard, op amps, passive components, tweaker pots: $25
4 ea ICL-7107 based LCD displays @$25 ea.: $100
Fudge factor: $15
WAG total cost: $150

Scrounge for components and the displays and you can easily halve this.

A single display will require some programming and complexity
somewhere. For a newbie, your best bet might be to use a serial output
analog-to-digital converter (ADC) with a Picaxe or BASIC Stamp. You
could then control one of the Scott Edwards Stamp-controllable serial
input LCD displays. I'd suggest these additions are probably going to
double the WAG estimate above. And that also assumes you have some
facility with programming.

How about this: tell a little more about the project, and what kind of
sensor you are choosing. Describe in a little more detail your
electronics capabilities. You then might be able to get a little more
specific help.

Good luck
Chris
 
B

Baron

Jan 1, 1970
0
I want to build a cuircut that will digitaly display air pressure
(0-200+ PSI) from 4 or 5 different sources on one small screen. Here
are my questions:

- Is this project feasible for someone with little knowledge of
electronics?

- Accuracy is not critical within a PSI or two would be fine. Would
it be simpler to use analog sending units or digital sensors?

- How would the cuircut work? Would it somehow take the signal from
the
sensors and convert it to pounds per square inch and then send it
to something that would display that information on a LCD screen?

- What would be a rough estimate of the cost of this project?

Thank you,

Erik-

Just buy a digital tyre pressure gauge ! £9.95 in Woolies
 
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