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)