# LILYGO T-Circle S3

> Compact ESP32-S3 board with a 0.75" round 160×160 TFT LCD (GC9D01N), 16MB flash, 8MB PSRAM, WiFi, and BLE 5 for wearable watchface and circular display applications.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** dev-board
- **Price:** ~$23.68
- **Product Readiness:** developer
- **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, AI instructions
- **CPU Architecture:** Xtensa LX7
- **CPU Cores:** 2
- **RAM:** 512KB SRAM
- **PSRAM:** 8MB
- **Flash:** 16MB
- **USB:** USB-C
- **Power:** 5V + LiPo
- **Operating Voltage:** 3.3V
- **Antenna:** Built-in PCB antenna
- **Display:** 0.75" TFT LCD 160×160

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 5.0

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** No

## Certifications

CE, FCC

## Compatible Firmware

arduino, esp-idf, micropython

## Use Cases

- smart-watch
- wearable-display
- smart-display

## Components

- **ESP32-S3R8** (mcu): Xtensa LX7 dual-core at 240MHz with 16MB flash, 8MB PSRAM, WiFi, and BLE 5.0. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-circle-s3&source=md-export)
- **GC9D01N** (display-driver): Circular TFT LCD display driver supporting 160×160 resolution for round watch-style displays. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Circle-S3&ref=openhardware.directory&product=lilygo-t-circle-s3&source=md-export)

## Protocols

- **SPI**: CLK: GPIO12, MOSI: GPIO11, CS: GPIO10, DC: GPIO9
- **I2C**: SDA: GPIO4, SCL: GPIO5

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| GPIO11 | SPI MOSI (Display) | SPI | digital-output |
| GPIO12 | SPI CLK (Display) | SPI | digital-output |
| GPIO4 | I2C SDA | I2C | digital-input, digital-output |
| GPIO5 | I2C SCL | I2C | digital-input, digital-output |

## Description

## Overview

The LILYGO T-Circle S3 is a compact development board built around the ESP32-S3R8, featuring a 0.75-inch circular TFT LCD (GC9D01N driver, 160×160 pixels) designed for round watchface and dial-style user interfaces. Despite its tiny footprint, it includes 16MB flash and 8MB PSRAM for complex animated UI applications.

The circular display enables natural watchface layouts, gauge meters, speedometers, and radar-style visualizations that look awkward on rectangular screens. The ESP32-S3's WiFi and BLE 5.0 connectivity enables real-time data display from servers, BLE devices, or Home Assistant.

Available in two variants: T-Circle S3 (full featured with ESP32-S3R8) and the bare T-Circle (stripped-down version at $8.40). Both are suitable for wearable development prototyping, miniature smart displays, and round-screen IoT dashboards.

## Where to Buy

- [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-circle-s3&ref=openhardware.directory&product=lilygo-t-circle-s3&source=md-export) — $23.68

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-circle-s3&ref=openhardware.directory&product=lilygo-t-circle-s3&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Circle-S3&ref=openhardware.directory&product=lilygo-t-circle-s3&source=md-export)

## Tags

`esp32-s3`, `round-display`, `circular`, `tft`, `wearable`, `watchface`, `lilygo`

## Images

![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/4abcaf3654df.jpg)
![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/11dca595cafa.jpg)
![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/9c78944949bb.jpg)
![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/b901a95129ff.jpg)
![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/d07950826eb6.jpg)
![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/77d8ec339a0f.jpg)
![LILYGO T-Circle S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-circle-s3/aa15f39401df.png)

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