ESP32-S2: Pin mapping

[JanPetterMG]

🔧 ESP32-S2: Pin Tips & Gotchas

🎉 Feel free to share your insights, questions, or setups below!

💡 This thread is for beginners and experienced users alike. Whether you're figuring out your first build or have clever tricks to share, you're welcome to join in.

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⏰ RTC Pins

GPIO 1–21 can wake the ESP32-S2 from deep sleep. Useful for:

• Power button PIN_SW1
• Mode button PIN_SW2
• Interrupts like PIN_INT from a real-time clock

🎙️ Analog Input

GPIO 1–10 are usable as analog inputs. For example:

• PIN_LDR for photocell signals
• PIN_MIC for microphone signals

⚠️ Avoid Strapping Pins

GPIO 0, 45, 46 have bootstrapping functions. Avoid connecting these to inputs that may float or pull them during boot.

📄 Reference

ESP32-S2 Datasheet (PDF)

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💬 Add your own:

• Board name
• Pinout overview
• Tips or pitfalls you encountered
• Questions or confusions you had as a beginner

Feel free to include your SPI, PWM, I2C, or other digital pin setups too—this thread is meant to cover practical pin mapping across different ESP32-S2 boards.

Let’s make this a helpful resource together!

[JanPetterMG]

Adafruit QT Py ESP32-S2

📍 Pinout Diagram

Hardware overview

// IKEA Frekvens
#define PIN_OE 7    // SDA EN
#define PIN_MIC 8   // A3  U3 pin 7
#define PIN_CS 9    // A2  LAK
#define PIN_SW1 17  // A1  SW1
#define PIN_SW2 18  // A0  SW
#define PIN_MOSI 35 // MO  DA
#define PIN_SCLK 36 // SCK CLK

// IKEA Obegränsad
#define PIN_OE 8    // A3  EN
#define PIN_CS 9    // A2  CLA
#define PIN_SW2 17  // A1  SW
#define PIN_MOSI 35 // MO  DI
#define PIN_SCLK 36 // SCK CLK

⚡ Power Notes

• 5V: Power input pin, supports 2.5 V to 6.0 V
• GND: Ground reference
• 3V: Logic-level power output for peripherals (e.g. level shifters)