How to Use ESP32-C6 : Examples, Pinouts, and Specs

Introduction

The ESP32-C6 is a low-power, dual-core microcontroller developed by Sparkfun under the part ID Qwiic. It is designed for Internet of Things (IoT) applications, offering integrated Wi-Fi 6 and Bluetooth 5 (LE) capabilities. Built on a 32-bit RISC-V architecture, the ESP32-C6 is highly versatile, supporting a wide range of peripherals and communication protocols. Its low power consumption and robust connectivity make it ideal for smart devices, home automation, wearables, and industrial IoT systems.

Explore Projects Built with ESP32-C6

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32-C6 and ST7735S Display: Wi-Fi Controlled TFT Display Module

This circuit features an ESP32-C6 microcontroller interfaced with a China ST7735S 160x128 TFT display. The ESP32-C6 controls the display via SPI communication, providing power, ground, and control signals to render graphics and text on the screen.

Open Project in Cirkit Designer

ESP32-Based Sensor Monitoring System with OLED Display and E-Stop

This circuit features an ESP32 microcontroller that interfaces with a variety of sensors and output devices. It is powered by a Lipo battery through a buck converter, ensuring a stable voltage supply. The ESP32 collects data from a DHT11 temperature and humidity sensor and a vibration sensor, controls a buzzer, and displays information on an OLED screen. An emergency stop (E Stop) is connected for safety purposes, allowing the system to be quickly deactivated.

Open Project in Cirkit Designer

ESP32C3 and LoRa-Enabled Environmental Sensing Node

This circuit features an ESP32C3 Supermini microcontroller connected to a LORA_RA02 module and a DHT11 temperature and humidity sensor. The ESP32C3 handles communication with the LORA module via SPI (using GPIO05, GPIO06, GPIO10, and GPIO04 for MISO, MOSI, NSS, and SCK respectively) and GPIO01 and GPIO02 for additional control signals. The DHT11 sensor is interfaced through GPIO03 for data reading, and all components share a common power supply through the 3.3V and GND pins.

Open Project in Cirkit Designer

ESP32-Based Air Quality Monitor with OLED Display and DHT11 Sensor

This circuit features an ESP32 microcontroller connected to a DHT11 temperature and humidity sensor, an MQ6 gas sensor, and a 1.3" OLED display. The ESP32 reads analog data from the MQ6 sensor via its VP pin, digital data from the DHT11 sensor via its D4 pin, and communicates with the OLED display using I2C protocol through pins D21 (SCL) and D22 (SDA). All components share a common ground (GND) and are powered by the ESP32's VIN pin, indicating a shared power supply.

Open Project in Cirkit Designer

Common Applications

• Smart home devices (e.g., smart lights, thermostats)
• Wearable technology
• Industrial IoT systems
• Wireless sensor networks
• Low-power Bluetooth applications
• Edge computing and AI/ML at the edge

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Technical Specifications

Key Technical Details

Pin Configuration and Descriptions

The ESP32-C6 has a total of 48 pins, with 22 GPIOs that can be configured for various functions. Below is a summary of the key pins:

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Usage Instructions

How to Use the ESP32-C6 in a Circuit

1. Power Supply: Provide a stable 3.3V power supply to the 3V3 pin. Ensure the ground (GND) is connected to the circuit's common ground.
2. Boot Mode: To upload code, connect GPIO0 to GND during reset to enter bootloader mode.
3. Programming: Use the Sparkfun Qwiic interface or a USB-to-serial adapter to program the ESP32-C6. The chip is compatible with the Arduino IDE and ESP-IDF.
4. Peripherals: Connect peripherals (e.g., sensors, actuators) to the GPIO pins. Configure the pins in your code for the desired function (e.g., input, output, ADC, PWM).

Important Considerations

• Voltage Levels: Ensure all connected peripherals operate at 3.3V logic levels. Use level shifters if interfacing with 5V devices.
• Power Consumption: Use deep sleep modes to minimize power consumption in battery-powered applications.
• Antenna Placement: For optimal Wi-Fi and Bluetooth performance, ensure the onboard antenna is not obstructed by metal or other conductive materials.

Example Code for Arduino UNO

Below is an example of using the ESP32-C6 to read an analog sensor and send data over Wi-Fi:

#include <WiFi.h> // Include the Wi-Fi library

// Wi-Fi credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

// Analog pin for sensor input
const int sensorPin = 34; // GPIO34 (ADC1_CH0)

void setup() {
  Serial.begin(115200); // Initialize serial communication
  WiFi.begin(ssid, password); // Connect to Wi-Fi

  // Wait for Wi-Fi connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWi-Fi connected!");
}

void loop() {
  int sensorValue = analogRead(sensorPin); // Read analog value from sensor
  float voltage = sensorValue * (3.3 / 4095.0); // Convert to voltage

  // Print sensor value and voltage
  Serial.print("Sensor Value: ");
  Serial.print(sensorValue);
  Serial.print(" | Voltage: ");
  Serial.println(voltage);

  delay(1000); // Wait 1 second before next reading
}

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Troubleshooting and FAQs

Common Issues and Solutions

1. ESP32-C6 Not Connecting to Wi-Fi

   • Solution: Double-check the SSID and password in your code. Ensure the router is within range and supports 2.4 GHz Wi-Fi (ESP32-C6 does not support 5 GHz Wi-Fi).

2. Code Upload Fails

   • Solution: Ensure GPIO0 is connected to GND during reset to enter bootloader mode. Verify the correct COM port and board settings in the Arduino IDE.

3. Unstable Power Supply

   • Solution: Use a decoupling capacitor (e.g., 10 µF) near the 3V3 pin to stabilize the power supply.

4. Low Wi-Fi Signal Strength

   • Solution: Check the placement of the ESP32-C6 module. Avoid placing it near metal objects or inside enclosures that block RF signals.

FAQs

• Q: Can the ESP32-C6 operate on 5V?
  A: No, the ESP32-C6 operates at 3.3V. Use a voltage regulator or level shifter for 5V systems.

• Q: Does the ESP32-C6 support OTA updates?
  A: Yes, the ESP32-C6 supports Over-The-Air (OTA) firmware updates.

• Q: Can I use the ESP32-C6 with the Arduino IDE?
  A: Yes, the ESP32-C6 is fully compatible with the Arduino IDE. Install the ESP32 board package to get started.

• Q: What is the maximum range of Wi-Fi and Bluetooth?
  A: Wi-Fi range is approximately 30 meters indoors and 100 meters outdoors. Bluetooth range depends on the environment but typically reaches up to 50 meters.

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This documentation provides a comprehensive guide to the Sparkfun ESP32-C6 (Qwiic), ensuring users can effectively integrate it into their projects.