error: 'ping' was not declared in this scope

Found out how to debug so I will not post the code, but here are the results. I tried to be descriptive in the debug comments so 'Begin Loop' is at the beginning of the 'void Loop()' or right before and after a decision or action like the 'rightMotorStop();' part of the code that should stop the servo if it is run. What it is currently showing is that the functions

void leftMotorStop()
{
digitalWrite(7, LOW);
}

void rightMotorStop()
{
digitalWrite(6, LOW);
}

are not coded correctly. I thought a LOW signal would turn off the input to the pins and stop the servos. How should these be coded?

Begin Loop

After inches and cm calculations

4in, 11cm
0  chkDistanceFwd  10  dangerThresh  

Between serial print and lcd print

Before ping and compare (cm>dangerThresh)

if (cm>dangerThresh) //if the path is clear

leftMotor.write(LForward); //move forward

rightMotor.write(RForward); //move forward



Begin Loop

After inches and cm calculations

4in, 10cm
0  chkDistanceFwd  10  dangerThresh  

Between serial print and lcd print

Before ping and compare (cm>dangerThresh)

  else //if path is blocked

rightMotorStop(); //stops servo***** NOT WORKING

leftMotorStop(); //stops servo***** NOT WORKING

Before ping and compare chkDistanceFwd = cm

Before (chkDistanceFwd<=dangerThresh)

if (chkDistanceFwd<=dangerThresh) //if center object is <= minimum programmed distance)

After if (chkDistanceFwd<=dangerThresh) //if center object is <= minimum programmed distance

After ping and compare chkDistanceFwd = cm



Begin Loop

After inches and cm calculations

3in, 9cm
10  chkDistanceFwd  10  dangerThresh  

Between serial print and lcd print

Before ping and compare (cm>dangerThresh)

  else //if path is blocked

rightMotorStop(); //stops servo

leftMotorStop(); //stops servo

Before ping and compare chkDistanceFwd = cm

Before (chkDistanceFwd<=dangerThresh)

if (chkDistanceFwd<=dangerThresh) //if center object is <= minimum programmed distance)

After if (chkDistanceFwd<=dangerThresh) //if center object is <= minimum programmed distance

After ping and compare chkDistanceFwd = cm



Begin Loop

After inches and cm calculations

2in, 7cm
9  chkDistanceFwd  10  dangerThresh  

Between serial print and lcd print

Before ping and compare (cm>dangerThresh)

  else //if path is blocked

rightMotorStop(); //stops servo

leftMotorStop(); //stops servo

Before ping and compare chkDistanceFwd = cm

Before (chkDistanceFwd<=dangerThresh)

if (chkDistanceFwd<=dangerThresh) //if center object is <= minimum programmed distance)

After if (chkDistanceFwd<=dangerThresh) //if center object is <= minimum programmed distance

After ping and compare chkDistanceFwd = cm