C3

The First ESP Microcontroller Based on RISC-V Architecture And A Very Fast One-Core CPU

In 2020, Expressif released both the S-Series and the first member of the C-Series.

C3 - RISC-V Architecture

The ESP32-C3 marks a fundamental change in processor architecture as it now uses RISC-V. The C3 is a very fast one-core microcontroller.

The C3 is a very cost-effective microcontroller that comes in development boards with a tiny form factor. The Wemos/Lolin C3 Mini shares the form factor with the old and highly popular ESP8266 D1 Mini, so you can continue to use shields (i.e. power supply and battery shields) designed for the D1 Mini.

The ESP32-C3 Super Mini board is even smaller: with 22.5x18mm, it can fit into even the smallest projects and DIY devices. Unfortunately, there does not seem to be an official source of documentation for this popular and widely available board. Here is an unofficial summary for the ESP32-C3 Super Mini found in the Internet.

Changes Compared To ESP32 WROOM/WROVER

Here is the list of removed or reduced features compared to ESP32:

Feature Removal
Cores 1 instead of 2
Frequency reduced from 240 to 160
SRAM reduced from 520 to 400
ROM reduced from 448 to 384
RTC RAM reduced from 16 to 8
GPIOs reduced from 34 to 22
LED PWM reduced from 16 to 6
UART reduced from 3 to 2
SPI reduced from 4 to 3
ADC reduced channels from 18 to 6
Motor PWM removed
Touch removed
DAC removed
SD support removed
Hall Sensor removed
Ethernet removed
Camera support removed

New Features

This is what’s new:

Feature Addition
Bluetooth BLE v5.0 instead of BLE v4.2
WiFi WiFi-Alliance/WPA 3 certified
Temperature Sensor added
SD Host extended from 1 to 2
USB OTG added

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(content created Mar 23, 2024)