Design with Serial LCD Kit in Cirkit DesignerThe Serial LCD Kit is a versatile and user-friendly module that enables the display of alphanumeric characters on an LCD. It incorporates a built-in controller, which simplifies the process of interfacing with various microcontrollers, including the popular Arduino platform. This module is commonly used in DIY electronics projects, hobbyist applications, and educational purposes to provide a visual output for data or user interface.
This circuit consists of an ESP32 Devkit V1 microcontroller connected to a 20x4 I2C LCD display. The ESP32 controls the LCD via I2C communication, with the SCL and SDA lines connected to GPIO pins D22 and D21, respectively, and provides power and ground connections to the display.
Open Project in Cirkit Designer
This circuit features an Arduino Leonardo microcontroller connected to a 16x2 I2C LCD screen, powered by a 5V battery. The Arduino is programmed to display and continuously scroll a message on the LCD. The I2C communication protocol is used for the microcontroller to interface with the LCD, utilizing the SDA and SCL connections for data transfer.
Open Project in Cirkit Designer
This circuit connects an ESP32 Devkit V1 microcontroller to an LCD TFT screen using SPI communication for display purposes and to an OBD2 diagnostic tool for vehicle data retrieval. The ESP32 reads vehicle speed data from the OBD2 interface via UART and displays it on the LCD screen. The circuit is designed for automotive diagnostics, specifically to read and display real-time vehicle speed.
Open Project in Cirkit Designer
This circuit features an A-Star 32U4 Mini microcontroller connected to a 16x2 I2C LCD screen. The microcontroller provides power and ground to the LCD, and communicates with it via the I2C protocol using the A4 (SDA) and A5 (SCL) pins.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | VCC | Power supply (5V) |
| 2 | GND | Ground connection |
| 3 | RX | Serial receive pin |
| 4 | TX | Serial transmit pin (not always used) |
| 5 | BL | Backlight control (optional) |
#include <SoftwareSerial.h>
// Initialize the software serial connection
SoftwareSerial serialLCD(10, 11); // RX, TX
void setup() {
// Set the baud rate for the serial connection
serialLCD.begin(9600);
// Clear the screen
serialLCD.write(0xFE);
serialLCD.write(0x01);
}
void loop() {
// Send a string to the LCD
serialLCD.write("Hello, World!");
// Wait for a while
delay(3000);
// Clear the screen before the next message
serialLCD.write(0xFE);
serialLCD.write(0x01);
// Send another string to the LCD
serialLCD.write("Serial LCD Kit");
// Wait again
delay(3000);
}
Note: The SoftwareSerial library is used to create a serial communication on digital pins 10 and 11, where pin 10 is defined as RX and pin 11 as TX. However, only the TX pin from Arduino is connected to the RX pin of the Serial LCD Kit.
Q: Can I use the Serial LCD Kit with a 3.3V system? A: It depends on the specific model of the Serial LCD Kit. Some may work at 3.3V, but level shifting may be required for proper operation.
Q: How do I adjust the contrast of the display? A: Contrast is typically adjusted via a potentiometer on the back of the LCD module. Turn the potentiometer until the desired contrast is achieved.
Q: Can I display custom characters or graphics? A: The Serial LCD Kit usually supports custom characters. Refer to the specific controller datasheet for instructions on how to create and display them.