Design Digital Voltage and Current Meter -V1,V2,V3 (20,100,200V) & (2,20A)

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    Design Voltmeter
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Discussion Overview

The discussion revolves around the design of a digital voltage and current meter with specified voltage and current ranges. The focus includes theoretical calculations and component selection, particularly for resistors in the circuit.

Discussion Character

  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant outlines the requirements for the meter, specifying voltage ranges of 20V, 100V, and 200V, and current ranges of 2A and 20A, with a supply voltage of 5V.
  • The same participant presents equations for calculating voltage outputs (V1, V2, V3) based on resistor values and expresses confusion over achieving valid resistor values, particularly noting R2 as negative.
  • Another participant mentions an attachment containing a schematic but indicates it cannot be uploaded due to file size limitations.
  • A further inquiry is made about the type of file being attempted for upload.

Areas of Agreement / Disagreement

The discussion does not appear to have reached a consensus, as participants have not yet resolved the issues related to the resistor values or the attachment of the schematic.

Contextual Notes

There are limitations regarding the resistor values, particularly the negative value for R2, which may indicate an error in calculations or assumptions. The inability to share the schematic may also hinder further discussion.

electronic engineer
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We were asked to design digital voltage and current meter with 3 ranges
(20 100 200) v for voltages and two ranges
(2, 20)A for amperes
Note: supply voltage is 5V
maximum value for resistors of ampere meter must not exceeded 0.5 ohm


V1=Vin. (R2+R3+R4)/(R1+R2+R3+R4)
V2=Vin.(R3+R4)/(R1+R2+R3+R4)
V3=Vin.(R4)/(R1+R2+R3+R4)

Where V1=V2=V3=V4=1 V
Vin changes respectively with V1,V2,V3 as 20,100,200
So we used those equations mentioned above when we considered R1+R2+R3+R4=6000 Kohm but we get these values:
R4=R3=30Kohm
R2= -30
Note: we have no problem with current meter,that's why I haven't referred to it at the attachment
Need help!
Thanks in advance!
 
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attachment

sorry, i can't download the my schematic cause it exceedes the max.file size

i don't know may be try later
 
What type of file are you trying to attach?
 
PNG file , but it's oversize (about 400KB)
 

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