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//Example 2.14
clear;
clc;
//2.14(a)
Rs=120;
Vref=15;
imax=20*10^(-3);
Vb=2*Rs*imax;
Vtap=Vb/2;
Vtapch=0.01*Vtap;
v1=Vtap+Vtapch;
v2=Vtap-Vtapch;
v1ch=v1-v2;
i=v1ch/((Rs*Rs)/(Rs+Rs));
R1=(Vtap/i)-630;
R2=1000;
i3=2*imax+(4.8/R2);
R3=(2/i3)+6-0.642857 ;
R4=((Vref-(R3/2)*i3-Vb)/i3)-3;
printf("(a) R1=%.2f kohms",R1*10^(-3));
printf("\n R2=%.f kohms",R2*10^(-3));
printf("\n R3=%.f ohms",R3);
printf("\n R4=%.f ohms",R4);
//2.14(b)
printf("\n\n(b) To calibrate, first adjust R2 so that with no strain we get vO=o V. Then supply a known strain, preferably near the full scale, and adjust R3 for the desired value of vO.");
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