What is it?

The ABBY-ESP32-C3 Wireless Communication Bridge is a ready-to-go USB dongle style device allowing users to rapidly create and distribute a wireless UART bridge between two or more PC's, laptops, Raspberry Pi's, etc. The wireless protocol is peer-to-peer and does not require a connection to the Internet (no router required!).

Why was this built?

The ABBY-ESP32-C3 was originally developed as a wireless communication bridge for machine control with 3D printers, CNC machines, or PCB pick&place machines. The wireless bridge replaces physical cables and can be expanded to manage a large number of discreet nodes. Many other applications are possible such as home/industrial automation, mesh networking, custom wireless remote control, sensor monitoring, and 'remote button' functions to name a few.

What's so special?

The ABBY-ESP32-C3 documentation contains a working example of a wireless UART bridge. Other wireless bridge bus protocols are possible such as I2C, I2S, SPI, CAN, or user custom designs.

The ABBY-ESP32-C3 also features a high efficiency buck-boost regulator for operation from a small Lithium-Ion battery. Battery charge circuitry with charge LED is included in the design.

Feature Short List

• Espressif ESP32-C3-WROOM-02 32-bit RISC-V processor, up to 160 MHz.
• 384K SRAM, 4MB Flash memory.
• WiFi IEEE 802.11 b/g/n-compliant.
• Bluetooth LE, Bluetooth 5, Bluetooth mesh.
• New replacement for older ESP8266.
• Custom peer-to-peer networking with ESP-NOW wireless library.
• FreeRTOS supports multi-tasking with minimal system resources.
• Code development using the Arduino IDE, PlatformIO (VSCode), MicroPython, or ESP-IDF.
• Inverted F PCB antenna.
• Ultra small form factor (PCB = 3.2L x 2.0W x 0.6H cm).
• USB type A connector for bus communication, programming, and battery charging.
• Power from USB 5V or 3.7V L-Ion battery with reverse polarity protection (battery not included).
• High efficiency (> 90%) Buck-Boost switching regulator for extended battery life down to 2.5V.
• Battery fused with self-resetting 1A Poly-Fuse.
• Battery charge circuit included with a red LED displaying charge status.
• Auto firmware download circuit (no boot button).
• I/O breakout to board edge pins.
• Supports ESP32-C3 Serial programming/JTAG via a micro USB connector.
• Comes preloaded with the latest version of Micropython.
• See additional documentation on Github: