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Arduino Tutorial Converting I2C Code to LCD Display Code and vice versa

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By Kaviyarasu Ramesh K-Tech

 Arduino Tutorial Converting I2C Code to LCD Display Code and vice versa:

Converting I2C code to LCD display code and vice versa involves changing the communication protocol and the commands used to send data to the device. Here's a tutorial on how to do it:

Converting I2C Code to LCD Display Code:

  1. First, you need to initialize the LCD display using the proper initialization sequence. This usually involves setting the number of columns and rows, setting the cursor position, and turning on the display.
  2. Next, you need to change the commands used to send data to the display. Instead of using the Wire library to send data over I2C, you need to use the LiquidCrystal library to send data over the LCD interface. For example, instead of using Wire.write() to send data over I2C, you would use lcd.write() to send data to the LCD display.
  3. You also need to change the addresses used to communicate with the device. The I2C address is typically a 7-bit value that is used to identify the device on the bus. In contrast, the LCD display address is usually a set of pins that are used to select the device on the interface. You will need to refer to the datasheet for your particular LCD display to determine the correct pin configuration.
Converting LCD Display Code to I2C Code:

  1. First, you need to initialize the I2C interface using the Wire library. This involves calling Wire.begin() to start the interface and setting the device address using Wire.beginTransmission().
  2. Next, you need to change the commands used to send data to the device. Instead of using the lcd.write() command to send data over the LCD interface, you need to use the Wire.write() command to send data over I2C. For example, instead of using lcd.write(0x01) to clear the display, you would use Wire.write(0x01) to send the clear command over I2C.
  3. You also need to change the addresses used to communicate with the device. The LCD display address is usually a set of pins that are used to select the device on the interface. In contrast, the I2C address is a 7-bit value that is used to identify the device on the bus. You will need to refer to the datasheet for your particular device to determine the correct I2C address.

Convert I2C Code to LCD Display Code:

To convert I2C code to LCD display code, you'll need to change the communication protocol and commands used to send data to the device. Here's a step-by-step guide on how to do it:

  1. Initialize the LiquidCrystal library to communicate with your LCD display. You'll need to specify the pin numbers for the data pins and any other pins your particular display requires.
c++
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
  1. In the setup() function, you'll need to initialize the LCD display and set any necessary options such as the number of rows and columns, cursor settings, and backlight control.
c++
void setup() {
  lcd.begin(16, 2); // set number of columns and rows
  lcd.setCursor(0, 0); // set cursor position
  lcd.print("Hello World!"); // send data to display
}
  1. Replace any I2C communication commands with LiquidCrystal library commands. For example, to send data to the display using I2C, you might use the following code:
c++
Wire.beginTransmission(0x27);
Wire.write("Hello World!");
Wire.endTransmission();

To send the same data to the display using the LiquidCrystal library, you would replace those lines with:

c++
lcd.print("Hello World!");
  1. If your original I2C code used a specific I2C address to communicate with the device, you'll need to determine the correct pin configuration for your LCD display and update the LiquidCrystal library initialization accordingly.

And that's it! With these changes, you should be able to convert your I2C code to LCD display code.



LCD Display Code to Convert I2C Code

To convert LCD display code to I2C code, you'll need to change the communication protocol and commands used to send data to the device. Here's a step-by-step guide on how to do it:

  1. Initialize the Wire library to communicate using I2C. You'll need to specify the I2C address of the device you want to communicate with.
c++
#include <Wire.h>
#define DEVICE_ADDRESS 0x27 // I2C address of the device
  1. In the setup() function, you'll need to initialize the Wire library and any devices you want to communicate with. This might involve sending initialization commands or setting up the device in a specific mode.
c++
void setup() {
  Wire.begin(); // initialize the Wire library
  Wire.beginTransmission(DEVICE_ADDRESS); // start I2C transmission to device
  Wire.write(0x00); // send initialization command to device
  Wire.endTransmission(); // end I2C transmission
}
  1. Replace any LiquidCrystal library commands with Wire library commands. For example, to clear the display using the LiquidCrystal library, you might use the following code:
c++
lcd.clear();

To clear the display using I2C, you would replace those lines with:

c++
Wire.beginTransmission(DEVICE_ADDRESS);
Wire.write(0x01); // send command to clear display
Wire.endTransmission();
  1. If your original LCD display code used specific pin configurations to communicate with the device, you'll need to determine the correct I2C address for the device you want to communicate with and update the Wire library initialization accordingly.

And that's it! With these changes, you should be able to convert your LCD display code to I2C code.


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