Board

ESP32 C6

Device Description

Hello,

Please guide me on, How to connect SSD1306 OLED Display with ESP32 C6 Controller?

■しかく ESP32-C6 + OLED SSD1306 I2C Connection Issue

1. Hardware in Use

• Microcontroller: ESP32-C6 DevKitC-1
• Display: 0.96" OLED Module (I2C, SSD1306, ×ばつ64, 3.3V)
• Pins Used:
• SDA → GPIO 6 (LP_I2C_SDA)
• SCL → GPIO 7 (LP_I2C_SCL)
• VCC → 3.3V
• GND → GND

2. The Problem

• The OLED does not respond on the I2C bus.
• The serial monitor repeatedly shows:
  ■しかく No I2C devices found
  E (xxxx) i2c.master: I2C transaction unexpected NACK detected
• I2C scanners detect no devices at 0x3C or 0x3D, even though the OLED should use one of these.
• The OLED module has a 472 resistor (≈4.7kΩ), which may be a pull-up or address selector.

Hardware Configuration

• SDA → GPIO 6 (LP_I2C_SDA)
• SCL → GPIO 7 (LP_I2C_SCL)
• VCC → 3.3V
• GND → GND

Version

latest stable Release (if not listed below)

Type

Task

IDE Name

Arduino IDE

Operating System

Windows 11 Pro

Flash frequency

80 MHz

PSRAM enabled

yes

Upload speed

115200

Description

Connection issue

Sketch

#include <Wire.h>
#define SDA_PIN 6 // ESP32-C6 LP_I2C_SDA
#define SCL_PIN 7 // ESP32-C6 LP_I2C_SCL
void setup() {
 Serial.begin(115200);
 delay(2000);
 Serial.println("\n■しかく ESP32-C6 I2C Scanner (SDA=5, SCL=6)");
 Wire.begin(SDA_PIN, SCL_PIN, 100000); // 100kHz
}
void loop() {
 byte error, address;
 int nDevices = 0;
 Serial.println("Scanning...");
 for (address = 1; address < 127; address++) {
 Wire.beginTransmission(address);
 error = Wire.endTransmission();
 if (error == 0) {
 Serial.print("■しかく I2C device found at 0x");
 if (address < 16) Serial.print("0");
 Serial.println(address, HEX);
 nDevices++;
 }
 else if (error == 4) {
 Serial.print("■しかく Unknown error at 0x");
 if (address < 16) Serial.print("0");
 Serial.println(address, HEX);
 }
 }
 if (nDevices == 0)
 Serial.println("■しかく No I2C devices found\n");
 delay(2000);
}

Debug Message

No I2C devices found

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.