# Waveshare ESP32-S3-LR1121 > Compact castellated ESP32-S3 development board with Semtech LR1121 multi-band LoRa transceiver supporting Sub-GHz and 2.4GHz bands, WiFi, BLE 5.0, and Meshtastic compatibility in a 41x21mm form factor. ## Quick Facts - **Brand:** Waveshare - **Board Type:** dev-board - **Price:** ~$14.99 - **Product Readiness:** developer - **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, AI vector instructions - **CPU Architecture:** Xtensa LX7 - **CPU Cores:** 2 - **RAM:** 512KB SRAM - **PSRAM:** 2MB - **Flash:** 4MB - **USB:** USB-C (via adapter board) - **Power:** 5V - **Operating Voltage:** 3.3V - **Operating Temp:** -40 to +85C - **Dimensions:** 41 x 21 x 3.2mm - **Antenna:** IPEX-1 ## Connectivity - **Wifi:** 802.11 b/g/n - **Bluetooth:** BLE 5.0 - **Lora:** LR1121 Sub-GHz (850-930MHz) + 2.4GHz ## Open Source - **Firmware:** No - **Schematics:** No - **PCB Layout:** No ## Compatible Firmware arduino, esp-idf, meshtastic ## Use Cases - lora-mesh-networking - iot-gateway - remote-sensor-nodes - environmental-monitoring - off-grid-communication - smart-agriculture ## Components - **ESP32-S3** (mcu): Espressif ESP32-S3 Xtensa LX7 dual-core @ 240MHz with 512KB SRAM, 2MB PSRAM, WiFi 802.11 b/g/n 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=waveshare-esp32-s3-lr1121&source=md-export) - **LR1121** (radio): Semtech LR1121 third-generation LoRa transceiver supporting Sub-GHz + 2.4GHz + S-Band with LoRa/(G)FSK/LR-FHSS, AES-128 encryption, and -127dBm sensitivity — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fcdn.hackaday.io%2Ffiles%2F1901428135035328%2FLR1121_data_sheet_V1_1.pdf&ref=openhardware.directory&product=waveshare-esp32-s3-lr1121&source=md-export) ## Protocols - **SPI** - **I2C** - **UART** - **I2S** ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO0 | General purpose | — | digital-input, digital-output, pwm | | GPIO1 | ADC1_CH0 | — | digital-input, digital-output, adc, pwm | | GPIO2 | ADC1_CH1 | — | digital-input, digital-output, adc, pwm | | GPIO3 | ADC1_CH2 | — | digital-input, digital-output, adc, pwm | | GPIO4 | ADC1_CH3 | — | digital-input, digital-output, adc, pwm | | GPIO5 | ADC1_CH4 | — | digital-input, digital-output, adc, pwm | | GPIO6 | ADC1_CH5 | — | digital-input, digital-output, adc, pwm | | GPIO7 | ADC1_CH6 | — | digital-input, digital-output, adc, pwm | | GPIO8 | General purpose | — | digital-input, digital-output, pwm | | GPIO9 | General purpose | — | digital-input, digital-output, pwm | | GPIO10 | SPI MOSI | — | digital-input, digital-output, pwm | | GPIO11 | SPI MISO | — | digital-input, digital-output, pwm | | GPIO12 | SPI SCK | — | digital-input, digital-output, pwm | | GPIO13 | General purpose | — | digital-input, digital-output, pwm | | GPIO14 | General purpose | — | digital-input, digital-output, pwm | | GPIO15 | UART TX | — | digital-input, digital-output, pwm | | GPIO16 | UART RX | — | digital-input, digital-output, pwm | | GPIO17 | General purpose | — | digital-input, digital-output, pwm | | GPIO18 | General purpose | — | digital-input, digital-output, pwm | | GPIO19 | USB D- | — | digital-input, digital-output | | GPIO20 | USB D+ | — | digital-input, digital-output | ## Description ## Overview The Waveshare ESP32-S3-LR1121 is a compact development board combining the ESP32-S3 dual-core processor with Semtech's third-generation LR1121 multi-band LoRa transceiver. Available in HF (850-930MHz + 2.4GHz) and LF (410-510MHz + 2.4GHz) variants, it supports LoRa, (G)FSK, and LR-FHSS modulation with typical ranges of 5km on Sub-GHz and 2km on 2.4GHz ISM band. The board features a castellated module design at 41x21mm, making it suitable for both breadboard prototyping and direct soldering onto carrier PCBs. It includes an IPEX-1 antenna connector, TCXO crystal oscillator for frequency stability, and AES-128 hardware encryption. With Meshtastic firmware support, it can be used immediately for off-grid mesh networking. The ESP32-S3 provides WiFi 802.11 b/g/n and BLE 5.0 connectivity alongside the LoRa radio, enabling dual-path communication for IoT gateways and sensor nodes that need both local wireless and long-range capabilities. ## Where to Buy - [Waveshare](https://openhardware.directory/r?to=https%3A%2F%2Fwww.waveshare.com%2Fesp32-s3-lr1121.htm&ref=openhardware.directory&product=waveshare-esp32-s3-lr1121&source=md-export) — $14.99 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.waveshare.com%2Fesp32-s3-lr1121.htm&ref=openhardware.directory&product=waveshare-esp32-s3-lr1121&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fwaveshareteam&ref=openhardware.directory&product=waveshare-esp32-s3-lr1121&source=md-export) - [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fcdn.hackaday.io%2Ffiles%2F1901428135035328%2FLR1121_data_sheet_V1_1.pdf&ref=openhardware.directory&product=waveshare-esp32-s3-lr1121&source=md-export) ## Tags `esp32-s3`, `lora`, `lr1121`, `meshtastic`, `sub-ghz`, `2.4ghz`, `iot`, `waveshare`, `castellated` ## Images ![Waveshare ESP32-S3-LR1121](https://nbg1.your-objectstorage.com/openhardware-directory/entities/waveshare-esp32-s3-lr1121/59575cec8231.jpg) ![Waveshare ESP32-S3-LR1121](https://nbg1.your-objectstorage.com/openhardware-directory/entities/waveshare-esp32-s3-lr1121/75baf0a6d353.jpg) --- [View full device page](https://openhardware.directory/devices/waveshare-esp32-s3-lr1121)