# LILYGO T-OI Plus

> LILYGO T-OI Plus is a compact ESP32-C3 development board with Wi-Fi, BLE 5.0, Grove connectors, and optional 16340 battery holder, designed to fit Sonoff BASICR2 enclosures.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** ESP32-C3
- **Price:** ~$5.5
- **Product Readiness:** developer
- **CPU:** ESP32-C3
- **CPU Architecture:** RISC-V 32-bit
- **RAM:** 400KB SRAM
- **Flash:** 4MB
- **USB:** USB Type-C (CH340K)
- **Power:** 5V + Li-Ion 18650
- **Operating Voltage:** 3.3V

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** Bluetooth 5.0 + Mesh

## Open Source

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

## Compatible Firmware

arduino, platformio, micropython, esphome

## Use Cases

- iot
- smart-home
- smart-switch
- environmental-monitoring

## Components

- **ESP32-C3** (mcu): 32-bit RISC-V single-core processor at 160MHz with Wi-Fi 802.11 b/g/n, Bluetooth 5.0 BLE + Mesh, 400KB SRAM, 4MB flash. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-c3_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-oi-plus&source=md-export)
- **CH340K** (usb-serial): USB to serial converter chip enabling USB Type-C programming and communication. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.wch-ic.com%2Fdownloads%2FCH340DS1_PDF.html&ref=openhardware.directory&product=lilygo-t-oi-plus&source=md-export)

## Protocols

- **SPI**
- **I2C**
- **UART**
- **PWM**
- **ADC**
- **Grove**

## Available Software

- **[Arduino IDE]()** (open-source)
- **[PlatformIO]()** (open-source)
- **[MicroPython]()** (open-source)

## Description

## Overview

The LILYGO T-OI Plus is a miniature ESP32-C3 RISC-V development board designed as an upgrade path for Sonoff BASICR2 enclosures. It features Wi-Fi 802.11 b/g/n and Bluetooth 5 with mesh networking support, 4MB flash, 400KB SRAM, and runs at 160 MHz. The board includes a CH340K USB-to-serial chip with USB Type-C, two Grove 4-pin 2.0mm connectors for easy sensor/module expansion, and an optional 16340 lithium battery holder (sold with or without). It exposes 3×SPI, 2×UART, 1×I2C, PWM, and 12-bit ADC interfaces. Compatible with Arduino IDE, PlatformIO, and MicroPython.

## Where to Buy

- [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-oi-plus&ref=openhardware.directory&product=lilygo-t-oi-plus&source=md-export) — $5.50

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-oi-plus&ref=openhardware.directory&product=lilygo-t-oi-plus&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FLilyGO-T-OI-PLUS&ref=openhardware.directory&product=lilygo-t-oi-plus&source=md-export)

## Tags

`esp32-c3`, `risc-v`, `wifi`, `bluetooth`, `grove`, `battery`, `lilygo`, `iot`, `sonoff-replacement`

## Images

![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/9257b040381a.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/0f9918879e27.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/649b175a1110.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/56fdc8c58390.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/61fcbfa88582.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/b1221f385094.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/93710e222966.jpg)
![LILYGO T-OI Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-oi-plus/0a1ef8d873e4.jpg)

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