Hello Everyone,
I'm Saran, This code below is working, I can see respond on serial monitor but I cannot show on graph.
Could you please suggest me how to show graph on Arduino with PID type follow code below,
#include <PID_v1.h>
const int photores = A0; // Photo resistor input
const int pot = A1; // Potentiometer input
const int led = 13; // LED output
double lightLevel; // variable that stores the incoming light
// Tuing parameters
float Kp=0; // Initial Proportional Gain
float Ki=10; // Initial Intergral Gain
float Kd=0; // Intial Differential Gain
double Setpoint, Input, Output; // Thes are just variables for storingvalues
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);
// This sets up our PDID Loop
// Input is our PV
// Output is our u(t)
// Setpoint is our SP
const int sampleRate = 1; // Variable that determines how fast our PID loop runs
// Commuication setup
const long serialPing = 500; // This determines how often we ping our loop
// Serial pingback interval in milliseconds
unsigned long now = 0;
// placehodler for current timestamp
unsigned long lastMessage = 0; // This keeps track of when our loop last spoke to serial
// last message timestamp
void setup()
{
lightLevel = analogRead(photores); // Read in light level
Input = map(lightLevel, 0, 1024, 0, 255); // Change read scale to analog out scale
Setpoint = map(analogRead(pot), 0, 1024, 0, 255); // get out setpoint from session
Serial.begin(9600); // Start a serial session
myPID.SetMode(AUTOMATIC); // Turn on the PID loop
myPID.SetSampleTime(sampleRate); // Sets the sample rate
Serial.println("Begin"); // Hello World!
lastMessage = millis(); // Timestamp
}
void loop()
{
Setpoint = map(analogRead(pot), 0, 1024, 0, 255); // Read our setpoint
lightLevel = analogRead(photores); // Get the light level
Input = map(lightLevel, 0, 900, 0, 255); // Map it to the right scale
myPID.Compute(); // Run the PID loop
analogWrite(led, Output); // Write out the output from the PID loop to our LED piin
now = millis(); // Keep track of time
if(now - lastMessage > serialPing) // If it has been long enough give us some info on serial
{
// this should execute less frequently
// send a message back to the mother ship
Serial.print("Setpoint =");
Serial.print(Setpoint);
Serial.print(" Input = ");
Serial.print(Input);
Serial.print(" Output = ");
Serial.print(Output);
Serial.print("\n");
if (Serial.available() > 0) // If we sent the program a command deal with it
{
for (int X = 0; X < 4; X++)
{
switch (X)
{
case 0:
Kp = Serial.parseFloat();
break;
case 1:
Ki = Serial.parseFloat();
case 2:
Kd = Serial.parseFloat();
case 3:
for (int y = Serial.available(); y == 0; y--)
{
Serial.read(); // Clear out any residual junk
}
break;
}
}
Serial.print(" kp,Ki,Kd = ");
Serial.print(Kp);
Serial.print(",");
Serial.print(Ki);
Serial.print(",");
Serial.print(Kd); // Let us know what we just recived
myPID.SetTunings(Kp, Ki, Kd); // Set the PID gain constants and start running
}
lastMessage = now; // update the time stamp.
}
}
Thank you very much.
