LM35 + LCD HD44780 = VisioTherm1.0

Συνδέσετε το Arduino με έναν αισθητήρα θερμοκρασίας LM35 και μια οθόνη LCD (parallel HD44780) για να φτιάξετε το δικό σας θερμόμετρο κι όχι μόνο!

Συνδεσμολογία Arduino-LCD εδώ.

Δείτε και το βίντεο.

Παρακάτω, ο κώδικας της εφαρμογής VisioTherm 1.0 - download :

/* VisioTherm - Temperature Sensor(LM35) reading and optical representation to LCD(HD47780) display 
* 
* Copyright (c) 2011 Stavros Kalapothas (stavros@itsystem.gr)
* Version 1.0 (27/01/2011)
* License: GPL v3 (http://www.gnu.org/licenses/gpl.html)
*
* This sketch is based on the "LCD Hola example" by DojoDave, Tomek for K3 and fh-potsdam. I have used LM35 temperature sensor and an LCD with HD44780 controller L1671 (16 chars x 1 line).
* According to LCD specs L1671 is initialized as a 2 line display so the second 8 chars (9-16) are addressed beginning on (C0). 
*  
* There are the following pins to be considered:
*
* DI, RW, DB0..DB3, Enable, tempPin (8 in total)
*
*/

//LM35 init vars
float tempC;
int tempD;
int tempPin = 0;

//LCD init vars
int led = 13;
int DI = 12;
int RW = 11;
int DB[] = { 7, 8, 9, 10};
int Enable = 6;
int count = 0;
int blink_count = 0;

void LcdCommandWrite(int value) {
int i = 0;
int value1 = 0;
value1 = value;

value1 >>= 4;               //send the first 4 databits (from 8) + RW and DI
for (i=DB[0]; i <= DI; i++) {
  digitalWrite(i,value1 & 01);
  value1 >>= 1;
}
digitalWrite(Enable,LOW);   // send a pulse to enable
delayMicroseconds(1);
digitalWrite(Enable,HIGH);
delayMicroseconds(1);
digitalWrite(Enable,LOW);
delayMicroseconds(1);      // pause 1 ms according to datasheet
delay(1);

for (i=DB[0]; i <= DB[3]; i++) {  // second part of the second 4 bits (from 8)
  digitalWrite(i,value & 01);
  value >>= 1; 
}
value >>= 4;                 // send the RW and DI of the second 4 bits(from 8) 
for (i=RW; i <= DI; i++) {
  digitalWrite(i,value & 01);
  value >>= 1;
}
digitalWrite(Enable,LOW); // send a pulse to enable
delayMicroseconds(1000);
digitalWrite(Enable,HIGH);
delayMicroseconds(1000);
digitalWrite(Enable,LOW);
delayMicroseconds(1000); // pause 1 ms according to datasheet
}

void LcdDataWrite(int value) {
int i = 0;
int value1 = 0;
digitalWrite(DI, HIGH);
digitalWrite(RW, LOW);
value1 =value;
value1 >>= 4;                     //send the first 4 databits (from 8) 
for (i=DB[0]; i <= DB[3]; i++) {
  digitalWrite(i,value1 & 01);
  value1 >>= 1;
}
digitalWrite(Enable,LOW);   // send a pulse to enable
delayMicroseconds(1000);
digitalWrite(Enable,HIGH);
delayMicroseconds(1000);
digitalWrite(Enable,LOW);
delayMicroseconds(1000);   // pause 1 ms according to datasheet
delay(1);
digitalWrite(DI, HIGH);
digitalWrite(RW, LOW);
for (i=DB[0]; i <= DB[3]; i++) {
  digitalWrite(i,value & 01);
  value >>= 1;
}
digitalWrite(Enable,LOW);   // send a pulse to enable
delayMicroseconds(1000);
digitalWrite(Enable,HIGH);
delayMicroseconds(1000);
digitalWrite(Enable,LOW);
delayMicroseconds(1000); // pause 1 ms according to datasheet
}

// this function help us to write number over 9, easily in the lcd display

void LcdNumberWrite(int nr) {

int n1 = 0;
int n2 = 0;

n1 = n2 = nr;

n1 = n1 / 100;
LcdCommandWrite(560 + n1);  //512 used to write data (see commands for character module)
n2 = (n2 - n1 * 100) / 10;
LcdCommandWrite(560 + n2);  //512 used to write data (see commands for character module)
nr = nr - n1 *100 - n2 * 10;
LcdCommandWrite(560 + nr);  //512 used to write data (see commands for character module)
}

void setup (void) {

//LM35 init
Serial.begin(9600); //open serial port, sets data rate to 9600 bps
analogReference(INTERNAL); 
  
//LCD init
int i = 0;
for (i=Enable; i <= DI; i++) {
pinMode(i,OUTPUT);
}
delay(100);
// initiatize lcd after a short pause
// needed by the LCD controller

///////////////////////////////////////////////////// 4 pin initialization
LcdCommandWrite(0x03); // function set:
// 4 pin initialization
delay(64);
LcdCommandWrite(0x03); // function set:
// 4 pin initialization
delay(50);
LcdCommandWrite(0x03); // function set:
// 4 pin initialization
delay(50);
LcdCommandWrite(0x02); // function set:
// 4 pin initialization
delay(50);
LcdCommandWrite(0x28); // function set:
// 4-bit interface, 2 display lines, 5x7 font
///////////////////////////////////////////////////// end of 4 pin initialization 
delay(20);
LcdCommandWrite(0x06); // entry mode set:
// increment automatically, no display shift
delay(20);
LcdCommandWrite(0x0E); // display control:
// turn display on, cursor on, no blinking
delay(20);
LcdCommandWrite(0x01); // clear display, set cursor position to zero
delay(100);

LcdCommandWrite(0x80); // display control:
delay(20);

//////// under this line are the special stuff you don't need for a initialization

LcdCommandWrite(0x0F); //  cursor blink
delay(10);
}

void loop (void) {

tempC = analogRead(tempPin);           //read the analog value from the sensor
tempC = (1.1 * tempC * 100.0)/1024;    //convert the analog data to temperature 
tempD=tempC*100;                  
Serial.println(tempC);            //send the data to the computer for debug
  
//>>>>>>>>>>>>>>>>>>>>>>>>>>>possible commands for the Lcd Display>>>>>>><< able to use for LcdDisplays with 4 or with 8 DataPins

//LcdCommandWrite(0x01); // clear display, set the cursor to home position
//LcdCommandWrite(0x02); // set cursor position to zero
//LcdCommandWrite(0x0A); // set the display off 
//LcdCommandWrite(0x0E); // set the display on and with out cursor blink
//LcdCommandWrite(0x0F); // set the display on and  with cursor blink
//LcdCommandWrite(0x0F); //  cursor blink
//LcdCommandWrite(0x0E); //  cursor not blink
//LcdCommandWrite(0x18); // shift display and cursor to the left
//LcdCommandWrite(0x1c); // shift display and cursor to the right
//LcdCommandWrite(0x14); // shift cursor to the right
//LcdCommandWrite(0x10); // shift cursor to the left

//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> example <<<<<<<<<

LcdCommandWrite(0x02); // set cursor position to zero
delay(10);

// Write the message
//like this
//LcdDataWrite('I');
//and Number over 9 easely like this
//LcdNumberWrite(4);

//first msg
for ( count = 0; count<=7; count++) {
  int wrote [] = { 'I', 'T', 's', 'y', 's', 't', 'e',  'm'};
LcdDataWrite(wrote[count]);
} 
LcdCommandWrite(0xC0); //enable second line (2nd 8 chars for an 1X16 LCD)
delay(20);
for ( count = 0; count<=7; count++) {
  int wrote [] = { ' ', 'G', 'a', 'd', 'g', 'e',  't', 's'};
LcdDataWrite(wrote[count]);
}
delay(3000);

//scroll right
for ( count = 0; count<=7; count++) {
delay(500);
LcdCommandWrite(0x1c); //shift display & cursor to the right
}

LcdCommandWrite(0x01); //clear display
delay(1000);

//blink message 3 times
for ( blink_count = 0; blink_count<=2; blink_count++) {
//first 8 chars of message
  for ( count = 0; count<=7; count++) {
  int wrote [] = { 'V', 'i', 's', 'i', 'o', 'T',  'h', 'e'};
LcdDataWrite(wrote[count]);
}
//second 8 chars of message
LcdCommandWrite(0xC0); //enable second line
delay(20);
for ( count = 0; count<=7; count++) {
  int wrote [] = { 'r', 'm', ' ', '2', '0', '1',  '1', ' '};
LcdDataWrite(wrote[count]);
}
delay(1000);
LcdCommandWrite(0x01);
delay(1000);
}

//tempDisplay
LcdCommandWrite(0x01);
delay(1000);
tempDisplay(tempD);
delay(5000);
}

//temp reading calculation function
void tempDisplay(int value)
{
 int first, second, third, fourth;
 
 first = value / 1000;    
 second = (value - 1000 * first)/ 100;
 third = (value - 1000 * first - 100 * second)/ 10;
 fourth = (value - 1000 * first - 100 * second - 10 * third);
     
     LcdDataWrite(' ');
     LcdDataWrite(' ');
     LcdDataWrite(' ');
     LcdDataWrite(' ');
     LcdDataWrite(' ');
     LcdDataWrite(value > 999 ? first + 48 : ' ');  // begin onscreen
     LcdDataWrite(value > 99 ? second + 48 : ' ');
     LcdDataWrite('.');
     LcdCommandWrite(0xC0);
     LcdDataWrite(third + 48);
     LcdDataWrite(fourth + 48);
     LcdDataWrite(0xDF);
     
}