Olimex ESP32-C3-DevKit-Lipo is a tiny RISC-V board with WiFi 4, Bluetooth 5.0, and a LiPo battery charger

Olimex has just launched the ESP32-C3-DevKit-Lipo board based on ESP32-C3 RISC-V wireless microcontroller offering WiFI 4 and Bluetooth 5.0 connectivity, some I/Os, as well as USB and JTAG.

As its name implies, the board can be powered by a LiPo battery and charged through a USB Type-C port. It offers up to 15 GPIO for expansion and comes with an ICSP connector in case you need to reflash or debug the bootloader through a JTAG interface.

Olimex ESP32-C3-DevKit-Lipo

ESP32-C3-DevKit-Lipo specifications:

  • Wireless module – Espressif Systems ESP32-C3-MINI-1-N4 module with:
    • ESP32-C3 (ESP32-C3FN4) 32-bit RISC-V single-core processor up to 160 MHz with 4 MB embedded flash, 384 KB ROM, 400 KB SRAM (16 KB for cache), 8 KB SRAM in RTC
    • Connectivity – 2.4 GHz 802.11b/g/n Wi-Fi 4 1T1R up to 150 Mbps & Bluetooth LE 5.0 with PCB antenna
  • USB – 1x USB Type-C port for programming and JTAG debugging
  • Expansion – 2x 9-pin headers (soldered) with up to 15x GPIO and power supply signals (5V, 3.3V, GND)
  • Misc
    • ICSP programming connector to rescue (the bootloader) with ESP-PROG-C USB to serial converter
    • (Battery) status LED
    • RESET button
  • Power Supply
    • 5V via USB-C port
    • 2-pin header for LiPo battery; supports charging
  • Dimensions – Small with four mounting holes…

The board supports Arduino, PlatformIO, Espressif ESP-IDF, and other frameworks/languages compatible with ESP32-C3 microcontroller. Olimex ESP32-C3-DevKit-Lipo is open-source hardware and KiCad schematics, PCB layout, and other hardware design files have been released on GitHub under the “CERN Open Hardware Licence Version 2 – Strongly Reciprocal” together with ESP32-C3 datasheet and technical reference manual.

There’s also a basic ESP32-C3-DevKit-Lipo user manual on GitHub, and Shteryana Shopova used the board for a RISC-V workshop in Bulgaria (see the presentation slides in Bulgarian) where people could learn how to use the ESP-IDF with a C sample, JTAG debugging with OpenOCD, and she even showed some inline RISC-V assembly in the C code, as well as some Bluetooth demo apps.

RISC-V inline assembly in C code
Inline assembly in C code of Blinky sample.

Olimex sells the board for 6 Euros on their website.

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