Freematics ESPRIT-C3 is an Espressif ESP32-C3 RISC-V development board in Arduino UNO form factor with extra I2C, UART, JTAG interfaces.

Features

• Compatible with Arduino UNO pinouts
• Up to 240MHz clock frequency
• 520kB internal SRAM, 4MB Flash
• Integrated 802.11 BGN WiFi and dual-mode Bluetooth (classic and BLE)
• Onboard xBee socket for pluggable cellular modules
• I2C and serial UART pinouts
• JTAG pinouts

Pinouts

Freematics Esprit leads out nearly all useful ESP32’s GPIO pins, arranged in a deliberated order, to balance between accessibility and Arduino compatibility.

Extra pinouts In addition to standard Arduino pin headers as following.

• 4-pin I2C header: SDA(GPIO4), SCL(GPIO5), 3.3v, GND
• 4-pin serial UART header #1: Rx(GPIO18), Tx(GPIO19), VCC (3.3V/5V), GND
• xBee socket: Rx(GPIO32), Tx(GPIO33), VCC (3.3V/5V), GND

The VCC switch toggles between 3.3V and 5V for VCC pins for serial UART header and xBee socket. The VCC/GND pins on UART header can be used to power the board when switched to 5V by Freematics OBD-II UART adapter. The standard xBee socket VCC voltage is 3.3V, while all our cellular modules require 5V VCC.

Links

• ESPRIT-C3 Schematics
• ESP32 Arduino Core
• ESP32-C3 Product Page
• ESP32-C3 Programming Guide