homemade DVM

J

jab2508

New Member

• Apr 2, 2009

• #1

I have to build a homemade DVM using plyboard, & light bulbs to make 2 seven seg. displays separated by a decimal point. Then it has to be interfaced with a PLC so that when the leads are placed across some source, it lights up. Just don't know how to begin. Any info would be greatly appreciated!

 

blueroomelectronics

Well-Known Member

• Apr 2, 2009

• #2

Why do you have to build such an odd device?

 

3v0

Coop Build Coordinator

Forum Supporter

• Apr 2, 2009

• #3

Sounds like a fun project. First figure out how you measure voltage, resistance, and current flow.

If you have to make your own ADC how would you do that ?

Why a PLC instead of a micro controller ?

3v0

 

Sceadwian

Banned

• Apr 2, 2009

• #4

Sounds like an episode of McGuyver =\

 

3v0

Coop Build Coordinator

Forum Supporter

• Apr 2, 2009

• #5

Sceadwian said:

Sounds like an episode of McGuyver =\

Click to expand...

I look at it as an opertunity to have some fun. Helping the poster getting it to work, not making fun of him.

 

blueroomelectronics

Well-Known Member

• Apr 2, 2009

• #6

Sure it might be fun, but "have to" often means school assignment. And why a PLC? Request it too vague to do much with.

 

Sceadwian

Banned

• Apr 2, 2009

• #7

Oh I'm not making fun of him, but neither can I help. Something like this the first thing I would do is throw a micro controller at it and I don't see that on his list of materials =)

 

Andy1845c

Active Member

• Apr 2, 2009

• #8

I don't understand the request either. DVM = Digital Voltmeter I assume?

Do you have to make your own seven segment displays with lightbulbs? I don't quite understand that part. Can you use a micro controller to make the DVM?

Does the PLC come in after the voltmeter circuit is working?

 

Hero999

Banned

• Apr 4, 2009

• #9

I think he wants to use the A/D port on a PLC to monitor voltage and program is to control an array of light bulbs arranged as a seven segment display.