CrowPanel 2.1inch-HMI ESP32 Rotary Display 480*480 IPS Round Touch Knob Screen¶

What is a rotary screen?¶

The rotary screen is an intelligent interactive device that usually consists of a circular knob and a display. The knob can be rotated to control various functions, while the display is used to display relevant information.

ESP32 Display - 2.1 inch rotary screen, uses high-performance ESP32-S3 chip, equipped with 32-bit dual-core chip. The maximum clock frequency reaches 240MHz, with strong performance and easy to handle complex tasks.

Supports 2.4G WiFi and BLE low-power Bluetooth, to achieve reliable wireless communication, easily connect to the Internet, suitable for smart home, industrial control, portable devices and other scenarios.

Supports capacitive touch operation and knob input, the knob supports clockwise, counterclockwise rotation and full press operation, smooth feel, and various interaction methods.

The 5V charging interface supports both power supply and program burning, and is also equipped with three expansion interfaces: UART, I2C, and FPC, to meet various development needs.

It supports Arduino IDE, Espressif IDF, Lua RTOS, Home Assistant/PlatformIO/Micro Python, and supports the LVGL library; you can design the UI interface yourself. It is an ideal platform for DIY projects like a mechanical keyboard knob.

ESP32 Display - 2.1 inch rotary knob screen is not just an interactive module, but an intelligent interaction solution that combines high performance, multi-function, and ease of use. Whether you are an IoT developer, smart home enthusiast, or professional, you can find an efficient tool that meets your needs.

Self-developed by Elecrow with exclusive design.

Model DHE03921D

Specification¶

Main Chip: ESP32-S3R8
Processor	Equipped with high-performance Xtensa 32-bit LX7 dual-core processor, with a main frequency of up to 240MHz
System memory	512KB SRAM、8M PSRAM
Storage	16M Flash
Screen
Size	2.1 inch
Screen Type	IPS
Touch Type	Capacitive Touch
Resolution	480*480
Wireless Communication
Bluetooth	Bluetooth Low Energy and Bluetooth 5.0
WiFi	Support 802.11a/b/g/n，2.4GH
Hardware
UART Interface	1x UART1, 1x UART0; ZX-MX 1.25-4P
I2C Interface	ZX-MX 1.25-4P
FPC connector	12P, Power supply burning port
Button	RESET button, BOOT button, confirmation button (knob press switch)
LED Light	Power indicator, LED ambient light
Other
Power Input	5V/1A
Operating temperature	-20~65℃
Storage temperature	-40~80℃
Operation Power	Module: DC5VMain Chip: 3.3V
Size	797930mm
Shell	Aluminum alloy + plastic + acrylic
Net Weight	80g

Schematic Diagram：¶

ESP32-S3 with display and touch schematic diagram

Schematic Diagram:

Definition in the main program:¶

Arduino_ESP32RGBPanel *bus = new Arduino_ESP32RGBPanel(
  16 /* CS */, 2 /* SCK */, 1 /* SDA */,
  40 /* DE */, 7 /* VSYNC */, 15 /* HSYNC */, 41 /* PCLK */,
  46 /* R0 */, 3 /* R1 */, 8 /* R2 */, 18 /* R3 */, 17 /* R4 */,
  14 /* G0/P22 */, 13 /* G1/P23 */, 12 /* G2/P24 */, 11 /* G3/P25 */, 10 /* G4/P26 */, 9 /* G5 */,
  5 /* B0 */, 45 /* B1 */, 48 /* B2 */, 47 /* B3 */, 21 /* B4 */
);

Arduino_ST7701_RGBPanel *gfx = new Arduino_ST7701_RGBPanel(
  bus, GFX_NOT_DEFINED /* RST */, 0 /* rotation */,
  false /* IPS */, 480 /* width */, 480 /* height */,
  st7701_type5_init_operations, sizeof(st7701_type5_init_operations),
  true /* BGR */,
  10 /* hsync_front_porch(10) */, 4 /* hsync_pulse_width(8) */, 20 /* hsync_back_porch(50) */,
  10 /* vsync_front_porch(10) */, 4 /* vsync_pulse_width(8) */, 20 /* vsync_back_porch(20) */);

I2C_SDA_PIN: 38
I2C_SCL_PIN: 39
ENCODER_A_PIN: 42
ENCODER_B_PIN: 4
SCREEN_BACKLIGHT_PIN: 6

PCF8574 Extended IO (via I2C address 0x21):

- P0:Touchscreen reset

- P2: Touchscreen interrupt

- P3: LCD power

- P4: LCD reset

- P5: Encoder button (INPUT_PULLUP)

Platforms Supported¶

Arduino IDE	ESPHome

	[

Resource：¶

github：¶

CrowPanel-2.1inch-HMI-ESP32-Rotary-Display-480-480-IPS-Round-Touch-Knob-Screen

How to buy¶

Please visit this page to purchase CrowPanel 2.1inch-HMI ESP32 Rotary Display.

Support¶

If you have any problem about how to use it, you can connect to us at the bottom-right of bazzer or contact to techsupport@elecrow.com to get technology support.