Question

art A Based off Week 2 Content ее An H-bridge is a circuit that can be used to control a motor using simple on/off switches (see figure below S1 S3 S2 S4 Fig. 1. H-bridge Circuit We can describe the state of the switches in this circuit using an array. Within the array, 0 means the switch is off and 1 means the switch is on Example: 1,o,1.0] means switches 1 and 3 are on, while 2 and 4 are off The switch state will determine the state of the motor: If the switch state is [1,o,o,1] then th motor moves right If the switch state is CO,1,1, O] then the motor moves left If the switch state is [1,0,1,O] or [o,1,0,1] then the motor stalls Otherwise, the motor is off Questions: 1. Create a function that checks whether the input vector if in the correct format. If the input array is a 4-element row vector containing only ones and/or zeros, then the function returns 1. Otherwise, the function returnms 0 2. Create a function that returns 1 if the motor moves right, 2 if it moves left. 3 if it stalls, and 4 if the motor is off. You may assume that the input vector is in the correct format Useful Control Structures and Functions: if, elseif, else, isequal

Answer 1

Algorithm:

1.

CheckValid(vector)
{
   int size = vector.size();
   if not(size isequal 4)
       return 0;
   else
       for i from 0 to 3:
       {
           if not(vector[i] isequal 0) and not(vector[i] isequal 1):
               return 0;
       }
   return 1;
}

2.

MotorDirection(vector)
{
   if (vector[0] isequal 1) and (vector[1] isequal 0) and (vector[2] isequal 0) and (vector[3] isequal 1)
       return 1;
   elseif (vector[0] isequal 0) and (vector[1] isequal 1) and (vector[2] isequal 1) and (vector[3] isequal 0)
       return 2;
   elseif ((vector[0] isequal 1) and (vector[1] isequal 0) and (vector[2] isequal 1) and (vector[3] isequal 0)) or ((vector[0] isequal 0) and (vector[1] isequal 1) and (vector[2] isequal 0) and (vector[3] isequal 1))
       return 3;
   else
       return 4;
}

C code:

1.

int CheckValid(int *vector)
{
   int size = vector.size();
   if(size != 4)
       return 0;
   else
       for i from 0 to 3:
       {
           if ((vector[i] != 0) && (vector[i] != 1)):
               return 0;
       }
   return 1;
}

2.

int MotorDirection(int *vector)
{
   if ((vector[0] == 1) && (vector[1] == 0) && (vector[2] == 0) && (vector[3] == 1))
       return 1;
   elseif ((vector[0] == 0) && (vector[1] == 1) && (vector[2] == 1) && (vector[3] == 0))
       return 2;
   elseif (((vector[0] == 1) && (vector[1] == 0) && (vector[2] == 1) && (vector[3] == 0)) || ((vector[0] == 0) && (vector[1] == 1) && (vector[2] == 0) && (vector[3] == 1)))
       return 3;
   else
       return 4;
}

Thank you.