[his example 1]
- PID Simple Example
- Reading analog input 0 to control analog PWM output 3
********************************************************/
#include <PID_Beta6.h>
//Define Variables we'll be connecting to
double Setpoint, Input, Output;
//Specify the links and initial tuning parameters
PID myPID(&Input, &Output, &Setpoint,2,5,1);
void setup()
{
//initialize the variables we're linked to
Input = analogRead(0);
Setpoint = 100;
//turn the PID on
myPID.SetMode(AUTO);
}
void loop()
{
Input = analogRead(0);
myPID.Compute();
analogWrite(3,Output);
}
[Your non-working example]
include <WProgram.h>
include<PID_Beta6.h>
class foo{
public:
PID myPID;
}
I guess I don't understand your critique - your example stuff doesn't look like his example stuff????
Can you 'splain the problem in words of at most two syllables? 
Brian W