LILYGO’s T3 S3 LR1121 is an ESP32 Powered Dev board with Onboard LoRa, SD Card and OLED Display

LILYGO’s T3 S3 LR1121 can be considered an ESP32S3FH4R2 MCU-based versatile microcontroller board with 4MB Flash and 2MB PSRAM. It is designed for projects requiring both Wi-Fi and Bluetooth 5.0 connectivity with a compact design. Key features include a 66x36mm size, support for USB charging (500mA at 5V), and onboard functions like a reset button, boot button, and support for a TF card. It also has a 0.96-inch SSD1306 I2C OLED display with a resolution of 128×64. This board is basically made for wireless projects and wireless applications like IoT devices, wearable tech, and custom controllers.

Previously, we have written about various microcontroller boards including LILYGO T-DECK, the Challenger RP2040 SD/RTC, TEENSY 4.1, and many more. Feel free to check those out if you are interested in those products.

The T3 S3 LR1121 microcontroller board features an I2C interface with dedicated pins for communication. Specifically, the SDA (Serial Data Line) is connected to IO18, while the SCL (Serial Clock Line) is connected to IO17. It can easily perform data transfer between the board and peripheral devices, such as sensors and displays, using the I2C protocol.

LILYGO’s T3 S3 LR1121 Specifications:

• MCU: ESP32S3FH4R2
• Flash Memory: 4MB
• PSRAM: 2MB
• Dimensions: 66 x 36 mm
• USB Charging: 500mA at 5V
• Wireless Protocols: Wi-Fi + Bluetooth 5.0
• Onboard Functions:
  • Reset Button
  • Boot Button
  • Support for TF Card
• Display: 0.96-inch SSD1306 I2C OLED
  • Resolution: 128×64 pixels
• I2C Interface:
  • SDA: IO18
  • SCL: IO17
• LoRa Module:
  • Frequency: 830~945 MHz & 2.4 GHz
  • Modulations: LoRa, (G)FSK, LR-FHSS
  • Power Gain: +22 dBm (sub-GHz), +11.5 dBm (2.4 GHz)
• Antenna Connector: External antenna support for enhanced range and performance
• SD Card Slot: Supports external storage expansion via TF/SD card slot
• Power Supply: USB power input
• Dimensions: Compact design suitable for embedded applications
• Applications: Long-range wireless communication, IoT devices, low-power networking

Additionally, the T3 S3 LR1121 is a low-power LoRa transceiver. It operates across frequencies 830~945 MHz and 2.4 GHz. The power gain is impressive, with +22 dBm for sub-GHz and +11.5 dBm for 2.4 GHz. It supports different modulation techniques such as LoRa, (G)FSK, and Long Range FHSS (LR-FHSS). This makes it suitable for long-range and low-power communication applications. You can connect with antennas for a better signal so that you can use it for wireless communication.

As far as I understand, the T3 S3 LR1121 is a compact and versatile microcontroller board ideal for projects requiring both Wi-Fi and Bluetooth connectivity. With its integrated OLED display and features, it offers a strong basis for developing IoT devices and other wireless applications. Users can visit the LILYGO GitHub repository for technical support and additional product information. It is available on LILYGO’s product page at $23.98 USD.

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