Arduino Sketch    MP_SimpleConfig

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/*
MP_SimpleConfig
Performs simple MakerPlot configuration from Arduino

Sends Configuration information to MakerPlot for a basic plot.
Reads analog value, uses switches to set the setpoint
lighting an LED is above setpoint.
Plots analog values of input and setpoint and
digital values of switches and LED state.
 
 The circuit:
 * potentiometer connected to A0.
   Center pin of the potentiometer goes to the analog pin.
   side pins of the potentiometer go to +5V and ground
 * LED connected from digital D9 to ground
 * Pushbutton swithes on D2 and D3 going to ground.
 
 created 20 July 2012
 by Martin Hebel, SelmaWare Solutions
 
 This example code is in the public domain.
*/

const int analogInPin = A0;   // Analog input pin that the potentiometer is attached to
const int LEDpin = 9;         // Analog output pin that the LED is attached to
const int SW1pin = 2;         // Pushbutton switch, raise setpoint
const int SW2pin = 3;         // Pushbutton switch, lower setpoint

int sensorValue = 0;         // value read from the pot
int setPoint = 100;          // Initial value of setPoint
int SW1state = 0;            // Store state of SW1
int SW2state = 0;            // Store state of SW2
int LEDstate = 0;            // Store state of LED

void setup() {
  // configure hardware
  pinMode(SW1pin, INPUT_PULLUP);  // Enable pull-ups on switches
  pinMode(SW2pin, INPUT_PULLUP); 
  pinMode(LEDpin, OUTPUT);        // set LED to be an output pin
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
  config_MP();                    // function to configure MakerPlot
}

void loop() {
  measureData();       // measure values
  buttonControl();     // read buttons for control
  control();           // control based on settings
  plotData();          // diplay/plot values 
  // wait 100 milliseconds before the next loop
  delay(100);                    
}

void measureData()
{
   // read the analog in value
  sensorValue = analogRead(analogInPin);           
}
 
void buttonControl()
{  // Check states of pushbuttons, it pressed change setpoint up or down   
  SW1state = digitalRead(SW1pin);
  if (SW1state == 0)
  {
    setPoint+=10;                // add 10 to setPoint
                                 // display in Status box
    Serial.print("!STAT Setpoint increased to: "); 
    Serial.println(setPoint);
    Serial.println("!BELL");     // sound PC Bell
  }
  SW2state = digitalRead(SW2pin); 
  if (SW2state == 0)
  {
    setPoint-=10;                // subtract 10 from setPoint
                                 // display in Status box
    Serial.print("!STAT Setpoint decreased to: "); 
    Serial.println(setPoint);   
    Serial.println("!BELL");     // Sound PC Bell
  }
}

void plotData()
{
  // print the analog values formatted for MakerPlot
  Serial.print(sensorValue);  // send 1st value     
  Serial.print(",");          // send comma delimiter
  Serial.println(setPoint);   // send 2nd value with carriage return
 
  // print the digital values formatted for MakerPlot
  Serial.print("%");          // send binary indicator
  Serial.print(SW1state);     // send 1/0 for SW1
  Serial.print(SW2state);     // send 1/0 for SW2
  Serial.println(LEDstate);   // send 1/0 for LED with carriage return
}

void control()
{
   // Check pot value against setpoint, if above light LED
  if (sensorValue > setPoint)
    LEDstate = 1;
  else
    LEDstate = 0;
  digitalWrite(LEDpin,LEDstate);
}
void config_MP()
{
  delay(2000);                            // allow connection to stabilize
  Serial.println();                       // send in case garbage in queue
  Serial.println("!SPAN 0,1000");         // set span of Y-axis, 0 to 1000
  Serial.println("!TMAX 180");            // Set time to 180 seconds
  Serial.println("!YLBL ADC Value");      // label Y axis
  Serial.println("!GRID 20,20");          // set grid to 20 x 20
  Serial.println("!PNTS 4000");           // set data points to 4000
  Serial.println("!RSET(CR)!PLOT ON");    // reset plot, send CR as MP value, enable plotting
                                          // place constant text on plot
  Serial.println("@TEXT 30A,105A,1.5A,(Blue),Configured from Arduino");
}