Rev 2.0
Rev 2.0 introduced USB-C flashing by switching from the ESP32 to the ESP32-S2. This eliminates the need for a separate USB-to-serial adapter.
Specifications
Section titled “Specifications”- MCU: ESP32S2-Mini-2
- Board platform: esp32-s2-saola-1
- Power: DC Input (12V, 5.5x2.1mm)
- Flashing: USB-C port
- 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)
Factory Firmware Installation
Section titled “Factory Firmware Installation”ESP32-S2 Pin Assignment
Section titled “ESP32-S2 Pin Assignment”| Pin | Usage |
|---|---|
| GPIO0 | Boot Button, Push to enter flashing mode |
| GPIO1 | Builtin LED, Low=On |
| GPIO2 | unused |
| GPIO3 | unused |
| GPIO4 | unused |
| GPIO5 | unused |
| GPIO6 | unused |
| GPIO7 | unused |
| GPIO8 | unused |
| GPIO9 | unused |
| GPIO10 | unused |
| GPIO11 | unused |
| GPIO12 | Fan 1 PWM |
| GPIO13 | Fan 1 Sense |
| GPIO14 | Fan 2 PWM |
| GPIO15 | Fan 2 Speed Sense |
| GPIO16 | Fan 3 PWM |
| GPIO17 | Fan 3 Speed Sense |
| GPIO18 | Fan 4 PWM |
| GPIO21 | Fan 4 Speed Sense |
| GPIO26 | unused |
| GPIO33 | I2C SDA (HDC1080 + expansion header) |
| GPIO34 | I2C SCL (HDC1080 + expansion header) |
| GPIO35 | I2C INT (expansion header) |
| GPIO36 | unused |
| GPIO37 | unused |
| GPIO38 | unused |
| GPIO39 | unused |
| GPIO40 | unused |
| GPIO41 | User Button 3 |
| GPIO42 | User Button 2 |
| GPIO45 | User Button 1 (strapping) |
| GPIO46 | unused (strapping) |
I2C Extension Port
Section titled “I2C Extension Port”The board offers an I2C extension port above Fan 4.
| Nr. | Pin | Description |
|---|---|---|
| 1 | GND | |
| 2 | INT | GPIO 35 |
| 3 | SCL | GPIO 34, 4.7k Pull-Up |
| 4 | SDA | GPIO 33, 4.7k Pull-Up |
| 5 | +3V3 |
Example Configurations
Section titled “Example Configurations”- Basic Configuration — Minimal setup with 4 fans and essential features
For more examples, see the examples directory.