Hi all.
I recently purchased on of these. http://arduino.cc/en/Main/GTFT
All the code I have written for my project is currently for use with the 16X9 LCD I had gotten with a kit.
I have now purchased the screen mentioned above and am having trouble/inexperience porting the information onto this screen.
after much much reading I am aware that I can indeed change a float to a string to a char-array!! Numerous way at that.
Problem is I haven't a clue how to do it.
Iv referenced Arduino Playground - FloatToString wich directs me to this avr-libc: <stdlib.h>: General utilities. among'st others
I cannot find where to actually download the library. Even if I did I feel as if iv come as far as I can with the basics and this is going into a trickier territory!!
Also in the tft example( char sensorPrintout[4] 
what does the 4 within the square brackets mean. is this a reference to ascii codes?
Here is my code at the moment for the LCD. there is two voltages being displayed and two temperatures.
any help very much appreciated
#include "Adafruit_MAX31855.h"
#include <LiquidCrystal.h>
int thermoCLK = 7;
int thermoCS = 8;
int thermoDO = 9;
int thermoCS1= 13;
const int diverters = 37; // the number of the relay 17 pin (NORMALLY OPEN SOLINOID)
const int pump = 39; // the number of relay 2 pin 16 (THE PUMP)
const int heater = 6; // The heater relay
const int sensorPin1 = A0; // pressure transducer
const int sensorPin2 = A1; // presseure select by potentiometer
const int buttonPin = 10; // Trigger
const int tankvalve = 31; //solinoid valve 220 ~ V/AC
const int highlevel = 33;//Float switch N/O
const int lowlevel = 35;//Float switch N/O
unsigned long now = millis (); // time now
//"ALWAYS use unsigned long for timers, not int"
//(variable declaration outside setup and loop, of course)
unsigned long Timer = 3000 ; // number doesnt need to be here ?? makes no difference!!
// Initialize the Thermocouple
Adafruit_MAX31855 thermocouple1(thermoCLK, thermoCS, thermoDO);
Adafruit_MAX31855 thermocouple2(thermoCLK, thermoCS1, thermoDO);
// each of the adafruit thermocouples. Differintialized by the CS PINS
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int trigger = 0; // variable for reading the trigger status
int fulltank = 0; // initiall states
int emptytank = 0; // initiall states
void setup() {
Serial.begin(9600);
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
lcd.print("MAX31855 test");
// wait for MAX chip to stabilize
pinMode(diverters, OUTPUT);
pinMode(pump, OUTPUT);
pinMode(heater, OUTPUT); // all of these are stating which of he pins are, ins or outs :)
pinMode(buttonPin, INPUT);
pinMode(highlevel,INPUT);
pinMode(lowlevel,INPUT);
pinMode(tankvalve,OUTPUT);
delay(50);
}
void loop() {
int sensorVal1 = analogRead(sensorPin1);// read the value on AnalogIn pin 0 and store it in a variable
int sensorVal2 = analogRead(sensorPin2);// read the value on AnalogIn pin 1 and store it in a variable
float voltage = (sensorVal1/1024.0) * 5.0; // convert the ADC reading to voltage
float Pressure = ((voltage-0.5)/.45) ;
float voltage2 = (sensorVal2/1024.0) * 5.0; // convert the ADC reading to voltage
float Pressureselect = ((voltage2-0.5)/.45) ;
lcd.setCursor(0, 0);
// Print a message to the LCD.
lcd.print("Bar=");
// set the cursor to column 0, line 1
// line 1 is the second row, since counting begins with 0
lcd.print(Pressure,2);
lcd.print (" ");
lcd.setCursor(9, 0);
lcd.print ("SP="); // Set poinit
lcd.print (Pressureselect,1);
lcd.print (" ");
double blocktemperature = thermocouple1.readCelsius(); //storing what is read in a float/double so it can be used
double steamtemperature = thermocouple2.readCelsius(); //storing what is read in a float/double so it can be used
lcd.setCursor(0, 1);
lcd.print("T(B)="); //actuall wrighting on lcd screen
lcd.print(blocktemperature,0); //Float value too be printed
lcd.print (" ");
lcd.setCursor(9, 1);
lcd.print("T(H)="); //actuall wrighting on lcd screen
lcd.print(steamtemperature,0); //Float value too be printed
lcd.print (" ");
Serial.println(blocktemperature);
Serial.println(steamtemperature);
Serial.println(voltage);
Serial.println(voltage2);
// read the state of the trigger value:
trigger = digitalRead(buttonPin);
fulltank = digitalRead(highlevel);
emptytank = digitalRead(lowlevel);
#define TEMPSETPOINT 705 // Setting the temperature to a value@ #°C
#define TEMPDEADBAND 10 // # refers to #°C
#define PRESSUREDEADBAND 0 // 1 = 1 BAR etc
if (isnan( blocktemperature)) // isnan means if ther is nothing present in its brackets it can be used to do something
{
digitalWrite(heater, LOW); // heaters will not turn on
}
if (blocktemperature < TEMPSETPOINT - TEMPDEADBAND)
{
digitalWrite (heater, HIGH);
//digitalWrite (pinout, HIGH); // this is for when I have more outputs. led or high output for another system
}
else if
( blocktemperature > TEMPSETPOINT)
{
digitalWrite (heater, LOW);
}
if (fulltank == HIGH && emptytank == HIGH) {
digitalWrite (tankvalve, LOW);
}
else if (fulltank == LOW && emptytank == HIGH){
digitalWrite (tankvalve, HIGH);
}
else if (fulltank == LOW && emptytank == LOW){
digitalWrite (tankvalve, HIGH);
}
if (trigger == LOW || (emptytank == LOW)|| isnan(steamtemperature)||(steamtemperature >300)|| ( blocktemperature < 20) ) { //If any of these statements are true. the pump or valve will not activate.
// turn diverters off:
digitalWrite(diverters, LOW); // this is telling pin to go LOW ie. Off
}
else if (trigger == HIGH && (voltage < voltage2 - PRESSUREDEADBAND)){
// turn relay's sequence:
digitalWrite(diverters, HIGH);
digitalWrite (pump, HIGH);
(Timer = millis()); // timer is compared to arduino clock and if greater than before it will allow the timer to start once trigger is low
}
else if ((voltage > voltage2 - PRESSUREDEADBAND)|| isnan(steamtemperature)||(steamtemperature >300)|| ( blocktemperature < 20)||(emptytank == LOW)){
digitalWrite (pump, LOW);
}
if (Timer> 0 && millis () - Timer > 2000 ) // Time is in milliseconds. 1000 = 1 SECOND.
{
digitalWrite (pump, LOW);
}
delay(5);
}
.
Here is my code below