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ESP32-C6 Smart Fan — Wiring Diagram

GPIO Mapping (from config.h)

ESP32-C6                ECC11 Rotary Encoder
┌─────────────┐         ┌──────────────┐
│             │         │              │
│   GPIO1 ────┼─────────┼── PWM OUT ────► Fan (signal wire)
│   GPIO3 ────┼─────────┼── CLK        │
│   GPIO2 ────┼─────────┼── DT         │
│   GPIO4 ────┼─────────┼── SW (button)│
│             │         └──────────────┘
│   3.3V  ────┼────────── + (encoder power)
│   GND   ────┼────────── GND (encoder)
│             │
└─────────────┘

Tóm tắt đấu nối nhanh:

ESP32-C6 Đấu vào GPIO1 → MOSFET gate (qua R 330Ω) → quạt GPIO3 → Encoder CLK GPIO2 → Encoder DT GPIO4 → Encoder SW (nút) 3.3V → VCC encoder GND → GND encoder + GND quạt MOSFET IRLZ44N khuếch đại PWM 3.3V → 12V/24V. Nguồn quạt riêng.

Đấu xong báo tôi code tiếp app_matter.cpp!

Pin Connection Table

ESP32-C6 Pin Connect To Notes
GPIO1 Fan signal wire (PWM) 100-400Hz, 50% duty cycle
GPIO3 Encoder CLK Clock pulse, ANYEDGE interrupt
GPIO2 Encoder DT Direction detection
GPIO4 Encoder SW Button press, NEGEDGE interrupt (active low)
3.3V Encoder VCC Power for encoder module
GND Encoder GND + Fan GND Common ground
USB-C Computer / 5V power Power + flash + debug

Fan Driver Circuit (3.3V PWM → 12V/24V Fan)

ESP32-C6 GPIO1 (3.3V PWM)
        │
        ├── R1 (330Ω) ───┬── D1 (1N4148, protection)
        │                │
        │               G (IRLZ44N MOSFET gate)
        │               S ─── GND
        │               D ─── FAN(-)
        │
        │              FAN(+) ─── 12V/24V POWER SUPPLY (+)
        │              POWER SUPPLY (-) ─── GND (common)

IRLZ44N is a logic-level MOSFET — turns fully on at 3.3V gate voltage, no driver needed.

Parts List

Part Qty Purpose
ESP32-C6 dev board 1 Main MCU (Matter + Thread)
ECC11 Rotary Encoder module 1 Speed control knob + push button
IRLZ44N MOSFET 1 PWM amplification for fan
330Ω resistor 1 Gate current limiting
1N4148 diode 1 Flyback/ESD protection
12V or 24V PWM-compatible fan 1 The fan being controlled
12V/24V DC power supply 1 Separate power for fan

PWM Parameters

Parameter Value
Frequency range 100 Hz (min/off) — 400 Hz (max)
Duty cycle 50% fixed (square wave)
Resolution 13-bit (8192 levels)
LEDC Timer TIMER_0
LEDC Mode LOW_SPEED_MODE
LEDC Channel CHANNEL_0
Clock source LEDC_AUTO_CLK

Formula: freq = 100 + (speed_percent * 300) / 100

Encoder Settings

Parameter Value
Steps 0–33 (each step ≈ 3% speed)
Resolution 1 pulse per detent
Debounce Hardware (pull-up) + ISR edge detection

Notes

  • Fan GND and ESP32-C6 GND must be connected together (common ground)
  • Keep PWM wire from GPIO1 to MOSFET as short as possible
  • If fan draws > 5A, add a heatsink to the IRLZ44N
  • The 12V/24V power supply is SEPARATE from the USB power
  • 1N4148 diode goes between gate and GND (cathode to gate, anode to GND) for ESD protection