T-Circle get it now

Overview

LILYGO T-Circle is a circular screen development board based on ESP32. It features a 0.75-inch GC9D01N TFT LCD circular display with 160 × 160 resolution and 262K color support, equipped with CST816D capacitive touch chip for precise touch interaction. The hardware connects to external devices through 12 pins (including 3V3 power supply, SPI interface MOSI/SCK/CS, I2C communication SDA/SCL, and BLE enable pin BLEEN), compatible with development frameworks like Arduino. Its compact design integrates high-precision display, touch control, and low-power communication functions, suitable for smart watches, IoT device interfaces, or prototype development of micro embedded systems.

Note: T-Circle is the ESP32 version. For the ESP32-S3 version, see T-Circle S3.

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
T-Circle	✓		Basic display and touch examples

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Open the T-Circle project folder
4. Open platformio.ini and select your example
5. Click ✓ to compile, connect via USB-C, click → to upload

Arduino

1. Install Arduino IDE
2. Install Arduino ESP32
3. In Tools → Board, configure:

Arduino IDE Setting	Value
Board	ESP32 Dev Module
Upload Speed	921600
CPU Frequency	240 MHz (WiFi)
Flash Mode	QIO 80 MHz
Flash Size	16MB (128Mb)
Core Debug Level	None
Partition Scheme	Default Configuration
PSRAM	Enabled

4. Click Upload

Development Platforms

1. Arduino IDE
2. PlatformIO
3. MicroPython

Video

Key Features

• ESP32, 16 MB Flash, 8 MB PSRAM (Octal SPI), Wi-Fi + Bluetooth
• 0.75-inch GC9D01N TFT LCD (160 × 160), 262K color
• CST816D capacitive touch, I²C
• 12-pin expansion interface
• 2 × M1.6 mounting holes, 32 × 17 mm

Product Parameters

Feature	Specification
MCU	ESP32
Flash	16 MB
PSRAM	8 MB (Octal SPI)
Wi-Fi	2.4 GHz 802.11 b/g/n
Bluetooth	Bluetooth LE
Display	0.75-inch GC9D01N TFT LCD, 160 × 160
Touch	CST816D capacitive, I²C
Expansion	12-pin header
Power	5 V / 500 mA
Mounting Holes	2 × M1.6
Dimensions	32 × 17 mm

Pin Diagram

Dimension Diagram

Schematic

• T-Circle-S3 Schematic (reference)

Datasheet

• GC9D01N

Software Development

• T-Circle GitHub Repository

Dependent Libraries

• TFT_eSPI-2.5.43
• Arduino_DriveBus-1.1.16
• Arduino_GFX-1.3.7
• FastLED-3.6.0

FAQ

• Q. Why does my board keep failing to upload programs? A. Hold down the BOOT button, then press the RST button once, then click Upload to enter download mode.

• Q. What's the difference between T-Circle and T-Circle S3? A. T-Circle uses ESP32 as the main controller, while T-Circle S3 uses the more powerful ESP32-S3. Choose the appropriate version according to your project requirements.

Version History

Version	Release Date	Update Description
T-Circle V1.0	2021-03-14	Initial version