/*

     CMX   Actual Trip Voltage


Created:   12-Dec-2013

This program asks for the values of the 3 resistors in the
Hi/Low Voltage Monitor  Rx, Ry, Rz   and then knowing the
0.500 Volt threshold of the comparators in the  ADM12914
monitor IC   it prints out the actual Low and Hi Trip Voltages.

The intent is to help fine tune the trip voltages based on
the available resistors in the normal 1% series  and  to
confirm that the other cmx hi/low resistor program has picked
rational value resistors.

*/


#include <stdio.h>
#include <math.h>

#define   Comp_Voltage   0.500


main()

{
        float    Standing_Nom_mA,  V_Nom,  V_Tol     ;

        float    Rx_Ohms,   Ry_Ohms,   Rz_Ohms       ;

        float    Hi_Trip_Volts,   Low_Trip_Volts     ;

        float    Total_Divider_Ohms                  ;

        float    Hi_Trip_Current, Low_Trip_Current   ;



/*   Calculate the Actual Trip Voltages    */

        printf(" \n  \n  \n ")  ;

        printf("Enter the value of  Rx  in Ohms:  ");
        scanf( "%f", &Rx_Ohms )  ;
        printf(" \n ")           ;

        printf("Enter the value of  Ry  in Ohms:  ");
        scanf( "%f", &Ry_Ohms )  ;
        printf(" \n ")           ;

        printf("Enter the value of  Rz  in Ohms:  ");
        scanf( "%f", &Rz_Ohms )  ;
        printf(" \n ")           ;


        Total_Divider_Ohms  =  Rx_Ohms  +  Ry_Ohms  +  Rz_Ohms          ;

        Hi_Trip_Current  =  Comp_Voltage  /  Rz_Ohms                    ;

        Hi_Trip_Volts  =  Hi_Trip_Current  *  Total_Divider_Ohms        ;

        Low_Trip_Current  =  Comp_Voltage  /  ( Ry_Ohms  +  Rz_Ohms )   ;
      
        Low_Trip_Volts  =  Low_Trip_Current  *  Total_Divider_Ohms      ;

        V_Nom  =  ( Hi_Trip_Volts  +  Low_Trip_Volts )  /  2.0          ;

        V_Tol  =  (( Hi_Trip_Volts  -  Low_Trip_Volts )  /  2.0 )  /  V_Nom  ;

        Standing_Nom_mA  =  V_Nom  /  Total_Divider_Ohms  *  1000.0     ;


/*  Print all of this information.   */

    printf( "    Hi Trip voltage is = %5.3f Volts \n",
            ( Hi_Trip_Volts ) )  ;

    printf( "    Low Trip voltage is = %5.3f Volts \n",
            ( Low_Trip_Volts ) )  ;


    printf( " The Nominal voltage is = %5.3f Volts \n \n",
            ( V_Nom ) )  ;


    printf( " The Trip voltage tolerance is = %4.1f percent \n",
            ( (V_Tol * 100.0) ) )  ;


    printf( " The Nominal current is = %7.4f mA \n",
            ( Standing_Nom_mA ) )  ;

}