LilyGo T-Energy ESP32 S3 Wi-Fi Bluetooth Development Board

This development board combines the energy-efficient ESP32-S3 microcontroller with a 18650 battery holder for mobile IoT applications. The integrated ESP32-S3-WROOM-1-N16R8 features two LX7 cores, 16 MB flash, and 8 MB PSRAM for demanding projects. Thanks to 2.4 GHz Wi-Fi 4 and Bluetooth LE, the board can be wirelessly integrated into networks or used as a Bluetooth gateway. Two 20-pin headers provide up to 32 GPIO pins, including SPI bus, two UARTs, 13 ADC channels, and touch inputs, complemented by 5 V and 3.3 V power supply and ground. A four-pin Qwiic connector offers a simple interface for I2C sensors, allowing sensor modules to be connected without soldering. The power supply can be provided either via a 18650 Li-Ion cell or the USB-C port with 5 V / 500 mA; the integrated HX6610S charging controller and the IP3005A protection circuit ensure safe charging and reverse polarity protection. An On/Off switch completely disconnects the battery, while boot and reset buttons facilitate firmware development. The board supports programming via the Arduino IDE, VS Code (PlatformIO), or ESP-IDF and appeals to developers who wish to realize their projects with C/C++, Micropython, or Lua. With its compact dimensions of 91.5 × 32 × 20 mm and a weight of only 50 g, it is particularly suitable for mobile sensor nodes, data loggers, and energy-autonomous IoT prototypes.

Recommended accessories:

Li-Ion Battery 3.7V 3200mA NCR18650B 18650 with Flat Top

Features:

ESP32-S3-WROOM-1 module offers dual-core performance and integrates Wi-Fi 4 and Bluetooth LE.
Large memory with 16 MB flash and 8 MB PSRAM enables complex firmware and applications.
Two 20-pin headers provide up to 32 GPIO pins with SPI, UART, ADC, and touch.
Qwiic connector simplifies the use of I2C sensors and actuators.
HX6610S charging chip and IP3005A protection ensure safe 18650 battery charging and reverse polarity protection.
5 V/500 mA USB-C port serves as an alternative power source and programming interface.
Boot and reset buttons, as well as an On/Off switch, facilitate flashing and energy management.

Application examples:

As a battery-powered sensor node, the board transmits measurement data via Wi-Fi to a cloud.
For portable data loggers, it stores measurements locally and sends them via Bluetooth to a smartphone.
In smart home projects, it controls actuators via WLAN and wirelessly reads environmental sensors.
As an experimentation platform, it allows beginners to learn ESP32 programming and IoT technologies.
In outdoor installations, it serves as an energy-efficient control unit thanks to the 18650 battery and sleep functions.

Documentation:

Github

Technical data:

Manufacturer: LILYGO
Manufacturer SKU: H733
Microcontroller: ESP32-S3-WROOM-1 N16R8 with dual-core LX7 up to 240 MHz
Flash memory: 16 MB
PSRAM: 8 MB
Wireless connectivity: 2.4 GHz Wi-Fi 4, Bluetooth LE
GPIO header: 2 × 20-pin with up to 32 GPIOs, SPI, 2 × UART, 13 × ADC, Touch, 5 V, 3 V, and GND
Qwiic connector: 4-pin socket for 3 V UART/I2C extensions
Charging chip: HX6610S with reverse polarity protection via IP3005A
Power supply: USB-C 5 V / 500 mA or 18650 Li-Ion battery
Battery holder: Single 18650 slot with ADC pin IO03 for voltage measurement
Interfaces: USB-C, boot and reset buttons, On/Off switch, Qwiic port
Supported languages: C/C++, Micropython, Lua
Supported development environments: Arduino IDE, VS Code (PlatformIO), ESP-IDF
Dimension: 91.5 × 32 × 20 mm
Weight: 50 g