# ESP32-S3 LR1121 LoRa Development Board with 1.54inch OLED (HF, With Battery)

**Type:** Product page · **SKU:** WS-35899 · **Brand:** [Waveshare](https://core-electronics.com.au/brands/waveshare-in-australia)
**Page:** https://core-electronics.com.au/esp32-s3-lr1121-lora-development-board-with-1-54inch-oled-hf-with-battery.html ([markdown](https://core-electronics.com.au/esp32-s3-lr1121-lora-development-board-with-1-54inch-oled-hf-with-battery.html.md))

Build your own LoRa walkie-talkie: push-to-talk, an OLED status screen and a sturdy aluminium case, with battery included.

> ⚠ **Shipping Notice:** Road transport only: express and air services aren't available for this product.

## Pricing

- **Price:** $71.73 (inc GST) — $65.21 AUD, exc GST

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## Restrictions

**For use in Australia**

- Operate only in bands and with settings that are permitted for your location and application. Check this product’s supported frequencies in the description/specs.
- If you intend to operate outside shared/licence‑exempt conditions (e.g. in other bands, at higher power, with high‑gain antennas, or extended duty cycles), you must have the appropriate authorisation.
 
**For use in other regions**

- Follow the spectrum rules for your country/region and select frequencies and settings accordingly.

A declaration of use will need to be submitted during checkout.

## Description

A programmable LoRa handheld for sending voice and data over long distances. It brings together an ESP32-S3 microcontroller, a LoRa radio, voice audio hardware and a 1.54inch OLED screen in one enclosed unit.

A LoRa voice device normally means wiring a radio module, audio circuitry, a display and battery management together yourself. Here it's all integrated and cased, so you can go straight to writing firmware for long-range voice and data projects.

The LR1121 radio, on a Core1121 module, works in both the Sub-GHz and 2.4GHz bands. It supports both LoRa Chirp Spread Spectrum (CSS) and Frequency Hopping Spread Spectrum (FHSS), so one device can test two bands and two spread-spectrum techniques.

You can program it in the Arduino IDE or ESP-IDF, and Waveshare's wiki has tutorials for both, including a walkie-talkie example. **This is the HF version for the 850–930 MHz band, supplied with a 3.7V 1500mAh lithium battery.**

### Features

- Talk over LoRa at the press of a button: a dedicated push-to-talk key, a dual-microphone array with echo cancellation and an onboard audio codec and amplifier handle voice capture and playback, and also suit speech-recognition and wake-word projects
- Secure and versatile radio: an integrated AES-128 encryption engine, plus support for receiving and decoding analogue walkie-talkie signals
- Headroom for audio and interface code: a dual-core ESP32-S3 at up to 240MHz with 16MB Flash and 8MB PSRAM, plus 2.4GHz Wi-Fi and Bluetooth 5
- Keep track of battery level and time: a BQ27220 fuel gauge and a PCF85063A RTC, with CHG/PWR status LEDs
- Build custom controls without extra hardware: four programmable buttons for menus, power and push-to-talk functions
- Add your own sensors and peripherals: two 6-pin SH1.0 connectors break out 5V, 3V3, GND, UART and spare ESP32-S3 and LR1121 GPIO
- Log data or store audio locally on the TF card slot
- Built for carrying around: the anodised CNC aluminium case resists wear and scratches, with separate SMA connectors for the omnidirectional LoRa whip and the Wi-Fi antenna

### Specifications

| Controller | ESP32-S3, Xtensa 32-bit LX7 dual-core, up to 240MHz |
|---|---|
| Wireless | 2.4GHz Wi-Fi, Bluetooth 5 (BLE) |
| Memory | 16MB Flash, 8MB Octal PSRAM |
| LoRa module | Core1121 (LR1121 RF chip), SPI interface, 3.3V |
| LoRa bands | Sub-GHz (850–930 MHz, HF version) and 2.4GHz |
| Modulation | LoRa, (G)FSK, LR-FHSS |
| Display | 1.54inch OLED, 128 × 64 pixels, 0.25 × 0.25 mm pixel size, SSD1309 driver, I2C (0x3C) |
| Audio | ES7210 microphone ADC, ES8311 audio DAC, power amplifier, dual microphones, speaker output |
| RTC / fuel gauge | PCF85063A / BQ27220 |
| Storage | TF card slot (SDMMC 1-line mode) |
| Buttons | BOOT, PWR, MENU, PTT, RST |
| Expansion | 2x 6-pin SH1.0: 5V, 3V3, GND, TXD, RXD, IO1 / LR\_IO7, LR\_IO8, IO48, IO47, IO3, IO2 |
| USB | USB-C |
| Antenna connectors | 2x SMA (LoRa, Wi-Fi), 31 mm spacing |
| Dimensions | 110 × 55 × 14.5 mm (enclosure) |
| Development frameworks | Arduino IDE, ESP-IDF |

### Resources

- [Waveshare wiki](https://docs.waveshare.com/ESP32-S3-LR1121-OLED-1.54)

### What's Included

- 1x ESP32-S3-LR1121-OLED-1.54-HF development board, in black CNC aluminium case
- 1x LoRa whip antenna (SMA male)
- 1x mini Wi-Fi antenna
- 1x 3.7V 1500mAh lithium battery

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/W/S/WS-35899_ecommerce_1792127001954.jpg)