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

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The discussion focuses on designing a digital voltage and current meter with specified voltage ranges of 20V, 100V, and 200V, and current ranges of 2A and 20A, powered by a 5V supply. The equations for voltage outputs (V1, V2, V3) are provided, with a total resistance constraint of 6000 Kohm, leading to calculated resistor values, although R2 resulted in a negative value. The current meter design is reportedly functioning well, but the user faces challenges in sharing their schematic due to file size limitations. Assistance is sought for the design issues encountered. The thread highlights the complexities of electronic design and the importance of resistor values in achieving accurate measurements.
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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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