ESP32- C3

The ESP32-C3 is a 32-bit RISC-V microcontroller with Wi-Fi (2.4 GHz) and BLE 5.0.

It’s designed for:

Cost-sensitive IoT devices

Low-power applications

Battery-operated devices

Secure connected devices

Compared to the classic ESP32, the C3:

Uses single-core RISC-V (instead of dual-core Tensilica)

Offers lower power consumption

Supports Wi-Fi 4 + BLE 5.0

Smaller footprint for embedded designs

✨ Key Features

✅ Single-core 32-bit RISC-V CPU, up to 160 MHz
✅ Integrated 2.4 GHz Wi-Fi 802.11 b/g/n
✅ Integrated Bluetooth Low Energy 5.0
✅ Up to 22 GPIO pins (depending on module)
✅ 400 kB SRAM
✅ 4 MB flash (typical on dev boards)
✅ ADC (6 channels, 12-bit), DAC (1 channel), PWM, SPI, I²C, UART
✅ Operating voltage: 3.0–3.6 V
✅ Ultra-low-power deep sleep (~10 µA)
✅ Cryptographic hardware acceleration: AES, SHA, RSA, RNG

📊 Electrical Specifications (Typical)
Parameter Value
CPU Single-core RISC-V 32-bit
Clock speed Up to 160 MHz
RAM 400 kB SRAM
Flash 4 MB typical
Wi-Fi 802.11 b/g/n (20 dBm TX)
Bluetooth BLE 5.0
GPIO Up to 22 pins
ADC 12-bit, 6 channels
DAC 8-bit, 1 channel
UART / SPI / I²C / PWM Supported
Operating voltage 3.0–3.6 V
Peak current ~300 mA Wi-Fi TX
Deep sleep current ~10 µA
Operating temp -40 °C – 85 °C
🔌 Pin Configuration (Typical ESP32-C3 Dev Board)

GPIO0–GPIO21 → digital I/O / ADC / PWM / SPI / I²C

3.3 V / GND → power supply

EN / RESET → module reset

BOOT → firmware flashing mode

UART → TX/RX for programming and debugging

Exact pinout depends on module (ESP32-C3-WROOM-02, ESP32-C3-DevKitM-1, etc.)

⚙️ How It Works

Program via USB-UART (Arduino IDE, ESP-IDF, MicroPython)

CPU executes code, controls GPIO, sensors, actuators

Wi-Fi + BLE stack built-in → connect to cloud, mobile apps, or mesh networks

Supports sleep modes, interrupts, PWM, ADC, DAC, and serial protocols

Secure: built-in hardware encryption & RNG

🛠️ Common Applications

Battery-powered IoT sensors

BLE beacons & mesh networks

Smart home devices

Wearables

Wireless sensor networks

Low-power telemetry systems

Cloud-connected devices

💡 Design Tips
✅ Power supply

Use 3.3 V regulated, capable of 300 mA peaks during Wi-Fi TX.

✅ Flashing

Most dev boards have USB-UART interface → easy Arduino/MicroPython flashing.

✅ GPIO caution

Some pins are strapping pins → avoid using them for output at boot.

✅ Libraries

Use Arduino Core for ESP32-C3 or ESP-IDF — BLE and Wi-Fi libraries are optimized for C3.

✅ Quick Summary

ESP32-C3 = single-core RISC-V microcontroller with Wi-Fi & BLE 5.0

Perfect when you want:
✔ Low-cost, low-power IoT devices
✔ BLE 5.0 connectivity
✔ Cloud-connected smart devices
✔ Secure, efficient microcontroller for embedded systems