Design with Nextion Touch LCD 2.4" in Cirkit DesignerThe Nextion Touch LCD 2.4" is an intelligent Human Machine Interface (HMI) solution that provides a control and visualization interface between a human and a process, machine, application, or appliance. It is a standalone device that includes an onboard processor and memory for the creation of custom user interfaces. Common applications include IoT devices, DIY electronics projects, industrial controls, and consumer electronics.
This circuit features a Nano 3.0 ATmega328P microcontroller connected to a 16x2 I2C LCD display for output. Two pushbuttons, each with a 10k Ohm pull-down resistor, are connected to digital pins D2 and D3 of the microcontroller for input. The LCD and pushbuttons are powered by the 5V output from the microcontroller, and all components share a common ground.
Open Project in Cirkit Designer
This circuit features an Arduino Nano microcontroller interfaced with a 20x4 I2C LCD panel for display purposes. The LCD panel is powered by a 5V AC-DC power supply unit, and the Arduino Nano communicates with the LCD via I2C protocol using its A5 (SDA) and A1 (SCL) pins.
Open Project in Cirkit Designer
This circuit features an Arduino Nano microcontroller connected to a ST7735 128x128 1.44 TFT I2C Color display and multiple pushbuttons. The display is interfaced with the Arduino via digital pins for control signals and SPI pins for data transfer. The pushbuttons are connected to various digital and analog input pins on the Arduino, likely intended for user input to control the display or other functions within the code.
Open Project in Cirkit Designer
This circuit is centered around an Arduino Mega 2560, which controls a Nextion Touch LCD for user interface and a series of relays for switching various loads. The Arduino is powered by a 9V SMPS, and it drives an 8-channel 5V relay module to control devices like pumps, a loudspeaker, actuators, a heating plate, and a plucker. The relays are interfaced with solid-state relays (SSRs) and a thermistor for temperature sensing, enabling controlled power distribution to the connected devices based on programmed logic and user input.
Open Project in Cirkit Designer| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | +5V | Power supply (4.75V to 7V) |
| 2 | TX | Transmit pin for UART communication |
| 3 | RX | Receive pin for UART communication |
| 4 | GND | Ground |
#include <SoftwareSerial.h>
// Define the Nextion RX and TX pins
#define NEXTION_RX 10
#define NEXTION_TX 11
// Initialize the Nextion display
SoftwareSerial nextion(NEXTION_RX, NEXTION_TX);
void setup() {
// Set the baud rate for the Nextion display and the Arduino serial monitor
nextion.begin(9600);
Serial.begin(9600);
}
void loop() {
// Check if data is available to read from the Nextion display
if (nextion.available()) {
String message = nextion.readString();
Serial.print("Message from Nextion: ");
Serial.println(message);
}
// Check if data is available to read from the serial monitor
if (Serial.available()) {
String command = Serial.readString();
nextion.print(command);
}
}
Q: Can I use the Nextion display with a 3.3V microcontroller? A: Yes, but a logic level converter is recommended to match the voltage levels for reliable communication.
Q: How do I update the user interface on the Nextion display? A: Use the Nextion Editor to create or modify the user interface and upload it to the display via a micro USB cable.
Q: What is the maximum length for serial communication cables? A: It is recommended to keep the cable length as short as possible, ideally less than 2 meters, to prevent signal degradation.
For further assistance, consult the Nextion community forums or contact technical support.