Overview

The ESP32-C3-WROOM-02 is a general-purpose WiFi and Bluetooth LE module based on the ESP32-C3 SoC. It features a 32-bit RISC-V single-core processor and is designed for low-power IoT applications.

Test Status

• How to use Hardware? 👀
• Basic Config
• GPIO
• UART
• SPI
• I2C
• I2S
• (LED) PWM
• IR
• ADC
• Temperature Sensor
• Bluetooth
• CAN?

Hardware Features

• Module: ESP32-C3-WROOM-02
• CPU: 32-bit RISC-V single-core processor, up to 160 MHz
• ROM: 384 KB
• SRAM: 400 KB (16 KB for cache)
• RTC SRAM: 8 KB
• Flash: 4 MB
• WiFi: 802.11 b/g/n (2.4 GHz)
• Bluetooth: BLE 5.0
• GPIO Pins: Up to 15 GPIOs available
  • 3 strapping GPIOs
• ADC: SAR ADC (multiple channels)
• PWM: LED PWM controller
• SPI: Multiple interfaces
• UART: Multiple interfaces
• I2C: Hardware I2C
• I2S: Interface available
• USB: USB Serial/JTAG controller (built-in USB support)
• Other Peripherals:
  • Remote control peripheral
  • General DMA controller
  • TWAI® controller (compatible with ISO 11898-1, CAN Specification 2.0)
  • Temperature sensor
  • General-purpose timers
  • Watchdog timers
• Operating Voltage: 3.0V to 3.6V

Module Specifications

The ESP32-C3-WROOM-02 is a module that integrates:

• ESP32-C3 SoC
• 4 MB SPI flash
• PCB antenna
• All necessary passive components

NOTE: ⚠️ This module is designed to be soldered onto a carrier board for complete functionality.

GPIO Capabilities

The ESP32-C3 provides up to 15 GPIOs with various functions:

• Digital I/O: All GPIOs can be used for digital input/output
• ADC: Multiple channels for analog input
• PWM: Most GPIOs support PWM output
• I2C: Any GPIO can be configured for I2C (hardware support)
• SPI: Multiple SPI interfaces available
• UART: Multiple UART interfaces
• USB: Built-in USB Serial/JTAG (GPIO18/GPIO19)

Strapping Pins

The ESP32-C3 has 3 strapping pins that determine boot mode:

• GPIO2 - Boot mode strapping
• GPIO8 - Boot mode strapping
• GPIO9 - Boot mode strapping

These pins should be handled carefully during boot to ensure proper operation.

Basic Configuration

Basic configuration for ESP32-C3-WROOM-02 module.

esphome:
  name: my-esp32c3

esp32:
  board: esp32-c3-devkitm-1
  variant: esp32c3
  framework:
    type: esp-idf

USB Serial/JTAG

The ESP32-C3 includes a built-in USB Serial/JTAG controller on GPIO18 and GPIO19, allowing:

• Programming via USB without external USB-to-UART chip
• Serial communication over USB
• JTAG debugging over USB

This makes development easier and reduces the need for external components.

Important Notes

⚠️ Strapping Pins: GPIO2, GPIO8, and GPIO9 are used during boot for mode selection. Avoid connecting devices that could interfere with boot.

⚠️ RISC-V Architecture: The ESP32-C3 uses RISC-V architecture instead of Xtensa.

⚠️ Module vs Development Board: This is a module that requires a carrier board with:

• 3.3V power regulation
• USB connector (if using USB Serial/JTAG)
• Reset and boot buttons (recommended)
• Additional circuitry as needed

⚠️ Single Core: Unlike ESP32 (dual-core), the ESP32-C3 has a single core.

⚠️ Power Consumption: While optimized for low power, peak current during WiFi/BLE transmission can reach 350mA. Ensure adequate power supply.

Development Boards

Many development boards use the ESP32-C3-WROOM-02 module, such as:

• ESP32-C3-DevKitM-1
• ESP32-C3-DevKitC-02
• Various third-party boards

These boards add:

• USB-C connector
• Voltage regulator
• Boot and reset buttons
• LED indicators
• Breadboard-friendly pinout