OBJEX Link S3LW is a small development board based on the ultra-low-power ELPM-S3LW module with ESP32-S3 MCU and LoRaWAN connectivity and the ability to take 100W input via USB-C or a 2-pin terminal block for driving motors, controlling RGB LED strips, and other high-power projects.
It’s compliant with the USB PD standard, features two 28-pin headers and a STEMMA I2C connector for expansion, as well as a built-in CP2102/CP2104 USB to serial bridge for debugging, and a few buttons. The company also offers an OBJEX ELPM-S3 module and OBJEX Link S3 board with the same features, minus LoRa/LoRaWAN support.
OBJEX Link S3LW specifications:
- Wireless module ELPM-S3LW v1.2
- Wireless SoC – ESP32-S3FN8
- CPU – Dual-core 32-bit Xtensa LX7 microcontroller with AI vector instructions up to 240MHz, RISC-V ULP co-processor
- Memory – 512KB SRAM
- Storage – 8MB flash
- Wireless – 2.4GHz WiFi 4 (802.11b/g/n), Bluetooth 5.0 BLE + Mesh
- LoRa support
- LoRa Transceiver – Semtech SX1262 connected over SPI to the ESP32-S3 MCU
- Frequency bands – 862 MHz to 928 MHz
- Tx power – 22 dBm
- Range – 10 km
- Full compatibility with LoRa and LoRaWAN
- Antenna
- Ceramic antenna for WiFi/BLE
- 50 Ohm pin for WiFi/BLE
- 50 Ohm U.FL/pad antenna for LoRa
- Expansion – 33x GPIO pins with I²C, I²S, SPI, UART, and USB; note: 7x reserved for LoRa – SPI
- Misc – RGB status LED (WS2812B)
- Low Power features (Deep Stop mode)
- Dedicated LDO1 3V3@300mA for ESP32
- Rising/falling edge detector (1-30nA)
- Wake and Gate input (1-30nA)
- RTC RV-3028-C7 (45-100nA)
- Dedicated RTC power supply pad
- Battery level circuit (zero leakage mesh current)
- Dimensions – 30 x 18 mm
- Weight – 2.30 grams
- Wireless SoC – ESP32-S3FN8
- Expansion
- 2x 28-pin headers with I/Os from the module and 5V, 3.3V, GND power signal
- 4-pin STEMMA I2C connector
- Debugging – USB to UART Bridge (CP2102/CP2104)
- Misc
- Power switch
- Four buttons (BOOT, MAKE, BTN*, RST)
- Configuration jumpers
- Power Supply
- Up to 21V/5A via USB-C PD (Type 2.0 PD PPS 3.0)
- Terminal block for Vbus (USB Type-C PD)
- DC/DC synchronous step-down (V-out: 5V/2 A)
- Dimensions – 84.74 x 30.50 mm
- Weight – 16.85 grams
OBJEX says the board is compatible with the ESP-IDF framework, Arduino, PlatformIO, MicroPython, and Rust. They also provide basic Arduino/PlatformIO example code to handle USB power delivery (PPS 3.0) and LoRa connectivity. The hardware design files for the OBJEX Link board and OBJEX ELPM module (I assume just the footprint) will be released on GitHub soon. You can also find a product brief and a datasheet on the product page.
Target applications for the OBJEX board and module include battery-powered nodes, Smart meters, asset tracking, Smart Cities, supply chain and logistics, building automation, energy harvesting, Smart Agriculture, and environmental sensors. It’s not the first ESP32 board that can take a high input voltage, and we previously wrote about the ESP32-S3 PowerFeather board, mostly designed to be powered by solar panels.
The ELPM-S3LW module can be purchased for 19.90 Euros on Hentronic, and the OBJEX Link S3LW board for 49.90 Euros. If you don’t live in Europe, there’s also an upcoming campaign on Crowd Supply, but the company was unable to tell me when it would be launched there. The video provides details about the origin of the module and board, an overview, and some use cases for a 100W-capable ESP32-S3 LoRaWAN board.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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