Rev 1.0

The Rev 1.0 is the original WiFi Fan Controller design based on the ESP32-WROOM-32E. It features serial flashing via a dedicated header and includes two external input ports not found on later revisions.

Specifications

• MCU: ESP32-WROOM-32E
• Board platform: esp32dev
• Power: DC Input (12V, 5.5x2.1mm)
• Flashing: Serial header (100mil and SOCbite)
• Fan outputs: 4x PWM headers
• Status LED: Red (single)
• Sensor: HDC1080 Temperature and Humidity
• Buttons: Reset, Boot, 3x User
• Expansion: I2C port (100mil, SCL, SDA, INT), 2x external input (100mil)

Factory Firmware Installation

Flash Rev 1.0 Factory Firmware

Serial flashing required

Rev 1.0 uses a serial header for flashing — you need a USB-to-serial adapter connected to the flashing header. This is different from Rev 2.0+ which use USB-C directly.

ESP32 Pin Assignment

Pin	Usage
GPIO0	Boot Button, Push to enter flashing mode
GPIO1	Serial TX
GPIO2	Builtin LED, Low=On
GPIO3	Serial RX
GPIO4	Fan 4 PWM
GPIO5	Unused (strapping pin)
GPIO12	Unused (strapping pin)
GPIO13	Fan 3 Speed Sense
GPIO14	Unused (outputs PWM at boot)
GPIO15	Unused (outputs PWM at boot, strapping pin)
GPIO16	Fan 4 Speed Sense
GPIO17	I2C SDA (HDC1080 + expansion header)
GPIO18	I2C SCL (HDC1080 + expansion header)
GPIO19	I2C INT (expansion header)
GPIO21	User Button 3
GPIO22	User Button 2
GPIO23	User Button 1
GPIO25	Fan 2 PWM
GPIO26	Fan 2 Speed Sense
GPIO27	Fan 3 PWM
GPIO32	Fan 1 PWM
GPIO33	Fan 1 Sense
GPIO34	External Input 1
GPIO35	External Input 2
GPIO36	Unused
GPIO39	Unused

I2C Expansion Port

The board offers an I2C extension port above Fan 4.

Nr.	Pin	Description
1	GND
2	INT	GPIO 19
3	SCL	GPIO 18, 4.7k Pull-Up
4	SDA	GPIO 17, 4.7k Pull-Up
5	+3V3

External Input Port

The board offers two external inputs, e.g. for a door intrusion alarm or a 100% power switch.

Nr.	Pin	Description
1	GND
2	IN2	10k Pull-Up
3	IN1	10k Pull-Up

Example Configurations

• Basic Configuration — Minimal setup with 4 fans and essential features

For more examples, see the examples directory.