Gambar 3. [sumber]
[/su_panel] [su_panel border=”3px solid #30C0F0″ radius=”10″]
Untuk lebih mudah mendeteksi alamat dari modul LCD pada sistem i2c, kita menggunakan i2c scanner. Bagian berikut dikutip dari
https://playground.arduino.cc/Main/I2cScanner.
Last Modified: March 05, 2017, at 02:02 PM
By: Frode Grimstad Bang
// --------------------------------------
// i2c_scanner
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum.
// The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
// Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26 2013
// V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
// by Arduino.cc user Krodal.
// Changes by louarnold removed.
// Scanning addresses changed from 0...127 to 1...119,
// according to the i2c scanner by Nick Gammon
// http://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
// As version 4, but address scans now to 127.
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("nI2C Scanner");
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
else if (error==4)
{
Serial.print("Unknown error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address,HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found");
else
Serial.println("done");
delay(5000); // wait 5 seconds for next scan
}
Gambar 4.
[/su_panel] [su_panel border=”3px solid #FF6666″ radius=”10″]
Bagian berikut diadaptasi dari:
http://www.carobot.cc/how-to/lcd-16×2-or-20×4-usage-guide/
Library: fdebrabander/Arduino-LiquidCrystal-I2C-library
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F,16,2);
void setup()
{
lcd.begin();
lcd.backlight();
lcd.print("tinker.");
lcd.setCursor(0,1);
lcd.print("sunupradana.info");
}
void loop()
{
}
Gambar 5.
[/su_panel]
[su_panel border=”3px solid #00C700″ radius=”10″]
Kode pengujian berikut terinspirasi dari komenter user bernama “turbiny” di halaman Instructables. Kode ini memanfaatkan pustaka dari Francisco Malpartida.
#include <Wire.h> // Comes with Arduino IDE #include <LiquidCrystal_I2C.h> // Set the pins on the I2C chip used for LCD connections: // addr, en,rw,rs,d4,d5,d6,d7,bl,blpol LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address
Kode lengkap hasil modifikasi:
/* Dimodifikasi dari : YourDuino.com Example Software Sketch 20 character 4 line I2C Display Backpack Interface labelled "LCM1602 IIC A0 A1 A2" [email protected] */ /* Contoh kode tambahan: https://www.arduino.cc/en/Tutorial/ */ /*-----( Import needed libraries )-----*/ #include <Wire.h> // Comes with Arduino IDE // Get the LCD I2C Library here: // https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads/ // Move any other LCD libraries to another folder or delete them // See Library "Docs" folder for possible commands etc. #include <LiquidCrystal_I2C.h> /*-----( Declare Constants )-----*/ //none /*-----( Declare objects )-----*/ // set the LCD address to LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); for a 16 chars 2 line display // Set the pins on the I2C chip used for LCD connections: // addr, en,rw,rs,d4,d5,d6,d7,bl,blpol LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address /*-----( Declare Variables )-----*/ //none void setup() /*----( SETUP: RUNS ONCE )----*/ { Serial.begin(9600); // Used to type in characters lcd.begin(16,2); // initialize the lcd for 16 chars 2 lines and turn on backlight //-------- Write characters on the display ---------------- // NOTE: Cursor Position: CHAR, LINE) start at 0 backLampu(); posNol(); delay(1000); lcd.clear(); lcd.off(); delay(1000); lcd.on(); delay(1000); aturKursor(); delay(1000); lcd.clear(); noDis(); delay(1000); lcd.clear(); geserKanan(); delay(1000); autoGeserDemo(); delay(500); kananKiri(); delay(1000); }/*--(end setup )---*/ void loop() /*----( LOOP: RUNS CONSTANTLY )----*/ { // when characters arrive over the serial port... if (Serial.available()) { uint8_t iCur = 0; // wait a bit for the entire message to arrive delay(100); // clear the screen lcd.clear(); // read all the available characters while (Serial.available() > 0) { // display each character to the LCD lcd.write(Serial.read()); iCur++; if(iCur > 15) { iCur = 0; lcd.setCursor(0,1); } } //EOF while } //EOF if }/* --(end main loop )-- */ void backLampu() { // ------- Quick 2 blinks of backlight ------------- for(int i = 0; i< 2; i++) { lcd.noBacklight(); delay(300); lcd.backlight(); delay(200); } // lcd.backlight(); // finish with backlight on } void posNol() { lcd.setCursor(0,0); //Start at character 0 on line 0 delay(1000); lcd.print("Kolom 0 Baris 0"); delay(1000); lcd.setCursor(0,1); lcd.print("Kolom 0 Baris 1"); delay(1000); } void aturKursor() { lcd.setCursor(0,0); //Start at character 0 on line 0 lcd.print("iic lcd"); delay(1000); lcd.setCursor(6,1); lcd.print("6:1"); delay(2000); } void noDis() { lcd.noDisplay(); delay(2000); lcd.display(); delay(1000); } void geserKanan() { /* Arduino tutorial */ lcd.setCursor(0,0); lcd.print("0"); delay(1000); // scroll 29 positions (string length + display length) to the right // to move it offscreen right: for (int positionCounter = 0; positionCounter < 16; positionCounter++) { // scroll one position right: lcd.scrollDisplayRight(); // wait a bit: delay(200); } delay(400); lcd.clear(); lcd.setCursor(0,1); lcd.print("0"); delay(200); for (int positionCounter = 0; positionCounter < 16; positionCounter++) { // scroll one position right: lcd.scrollDisplayRight(); // wait a bit: delay(200); } delay(1000); lcd.clear(); } void autoGeserDemo() { /* Arduino tutorial */ // set the cursor to (0,0): lcd.setCursor(0, 0); // print from 0 to 9: for (int thisChar = 0; thisChar < 10; thisChar++) { lcd.print(thisChar); delay(500); } // set the cursor to (16,1): lcd.setCursor(16, 1); // set the display to automatically scroll: lcd.autoscroll(); // print from 0 to 9: for (int thisChar = 0; thisChar < 10; thisChar++) { lcd.print(thisChar); delay(500); } // turn off automatic scrolling lcd.noAutoscroll(); // clear screen for the next loop: lcd.clear(); } /* Fungsi kananKiri dimodifikasi dari: https://www.arduino.cc/en/Tutorial/LiquidCrystalTextDirection */ void kananKiri() { int thisChar = 'a'; lcd.clear(); for(int i=0; i<26; i++) { // reverse directions at 'm': if (thisChar == 'm') { lcd.clear(); lcd.setCursor(12,0); // go right for the next letter lcd.rightToLeft(); } // reverse again at 's': if (thisChar == 's') { lcd.clear(); lcd.setCursor(5,0); // go left for the next letter lcd.leftToRight(); } // reset at 'z': if (thisChar > 'z') { // go to (0,0): lcd.home(); // start again at 0 thisChar = 'a'; } // print the character lcd.write(thisChar); // wait a second: delay(500); // increment the letter: thisChar++; } delay(800); lcd.clear(); } /* ( THE END ) */[/su_panel] [su_panel border=”3px solid #f1c112″ radius=”10″]
