esp32 lcd display for sale

ESP-LCD is a multimedia smart-control solution built around ESP32-S2-HMI-DevKit-1 and an LCD capacitive touch screen. With ESP-LCD, users can easily realize a hardware network, and achieve remote or smart-touch control, data visualization, music playback, recording, etc. ESP-LCD is suitable for several smart-control scenarios involving smart clocks, air-quality detectors, smart audio control, and various other applications based on touch screens.

ESP32-S2-HMI-DevKit-1 is a development board based on the ESP32-S2-WROVER module. It has a 4.3-inch TFT-LCD, and a capacitive touch panel with a resolution of up to 480×800 and an initial start-up time that is less than 200 ms. ESP32-S2-HMI-DevKit-1 has various components, including a light sensor, a temperature and humidity sensor, a MEMS sensor, a micro-SD card connector, a TWAI® interface (compatible with CAN 2.0) etc. On top of that, it also supports functions, such as LVGL GUI development, music playback, and recording.

This is a single-chip controller/driver for 262K-color, graphic type TFT-LCD.  It consists of 396 source line and 162 gate line driving circuits. This chip is capable of connecting directly to an external microprocessor, and accepts Serial Peripheral Interface (SPI), 8-bit/9-bit/16-bit/18-bit parallel interface.

T-Display-S3 is a development board whose main control chip is ESP32-S3. It is equipped with a 1.9-inch LCD color screen and two programmable buttons. Communication using the I8080 interface Retains the same layout design as T-Display. You can directly use ESP32S3 for USB communication or programming.

Want to display sensor readings in your ESP32 projects without resorting to serial output? Then an I2C LCD display might be a better choice for you! It consumes only two GPIO pins which can also be shared with other I2C devices.

True to their name, these LCDs are ideal for displaying only text/characters. A 16×2 character LCD, for example, has an LED backlight and can display 32 ASCII characters in two rows of 16 characters each.

If you look closely you can see tiny rectangles for each character on the display and the pixels that make up a character. Each of these rectangles is a grid of 5×8 pixels.

At the heart of the adapter is an 8-bit I/O expander chip – PCF8574. This chip converts the I2C data from an ESP32 into the parallel data required for an LCD display.

If you are using multiple devices on the same I2C bus, you may need to set a different I2C address for the LCD adapter so that it does not conflict with another I2C device.

An important point here is that several companies manufacture the same PCF8574 chip, Texas Instruments and NXP Semiconductors, to name a few. And the I2C address of your LCD depends on the chip manufacturer.

So your LCD probably has a default I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it.

Connecting I2C LCD to ESP32 is very easy as you only need to connect 4 pins. Start by connecting the VCC pin to the VIN on the ESP32 and GND to ground.

Now we are left with the pins which are used for I2C communication. We are going to use the default I2C pins (GPIO#21 and GPIO#22) of the ESP32. Connect the SDA pin to the ESP32’s GPIO#21 and the SCL pin to the ESP32’s GPIO#22.

After wiring up the LCD you’ll need to adjust the contrast of the display. On the I2C module you will find a potentiometer that you can rotate with a small screwdriver.

Plug in the ESP32’s USB connector to power the LCD. You will see the backlight lit up. Now as you turn the knob on the potentiometer, you will start to see the first row of rectangles. If that happens, Congratulations! Your LCD is working fine.

The I2C address of your LCD depends on the manufacturer, as mentioned earlier. If your LCD has a Texas Instruments’ PCF8574 chip, its default I2C address is 0x27Hex. If your LCD has NXP Semiconductors’ PCF8574 chip, its default I2C address is 0x3FHex.

So your LCD probably has I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it. Luckily there’s an easy way to do this. Below is a simple I2C scanner sketch that scans your I2C bus and returns the address of each I2C device it finds.

After uploading the code, open the serial monitor at a baud rate of 115200 and press the EN button on the ESP32. You will see the I2C address of your I2C LCD display.

But, before you proceed to upload the sketch, you need to make a small change to make it work for you. You must pass the I2C address of your LCD and the dimensions of the display to the constructor of the LiquidCrystal_I2C class. If you are using a 16×2 character LCD, pass the 16 and 2; If you’re using a 20×4 LCD, pass 20 and 4. You got the point!

First of all an object of LiquidCrystal_I2C class is created. This object takes three parameters LiquidCrystal_I2C(address, columns, rows). This is where you need to enter the address you found earlier, and the dimensions of the display.

In ‘setup’ we call three functions. The first function is init(). It initializes the LCD object. The second function is clear(). This clears the LCD screen and moves the cursor to the top left corner. And third, the backlight() function turns on the LCD backlight.

After that we set the cursor position to the third column of the first row by calling the function lcd.setCursor(2, 0). The cursor position specifies the location where you want the new text to be displayed on the LCD. The upper left corner is assumed to be col=0, row=0.

lcd.scrollDisplayRight() function scrolls the contents of the display one space to the right. If you want the text to scroll continuously, you have to use this function inside a for loop.

lcd.scrollDisplayLeft() function scrolls the contents of the display one space to the left. Similar to above function, use this inside a for loop for continuous scrolling.

If you find the characters on the display dull and boring, you can create your own custom characters (glyphs) and symbols for your LCD. They are extremely useful when you want to display a character that is not part of the standard ASCII character set.

CGROM is used to store all permanent fonts that are displayed using their ASCII codes. For example, if we send 0x41 to the LCD, the letter ‘A’ will be printed on the display.

CGRAM is another memory used to store user defined characters. This RAM is limited to 64 bytes. For a 5×8 pixel based LCD, only 8 user-defined characters can be stored in CGRAM. And for 5×10 pixel based LCD only 4 user-defined characters can be stored.

Creating custom characters has never been easier! We have created a small application called Custom Character Generator. Can you see the blue grid below? You can click on any 5×8 pixel to set/clear that particular pixel. And as you click, the code for the character is generated next to the grid. This code can be used directly in your ESP32 sketch.

After the library is included and the LCD object is created, custom character arrays are defined. The array consists of 8 bytes, each byte representing a row of a 5×8 LED matrix. In this sketch, eight custom characters have been created.