> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # 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. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=WS-35899:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/WS-35899:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## 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)