ESP32-C3 Upgrade Board Adds ESPHome Support to AC Infinity Airtap Fans

The board is built around the Seeed Studio Xaio ESP32-C3 module and includes a small OLED screen, a temperature sensor, and supports one or two PWM fan outputs, depending on the version. It’s built around the ESP32-C3 chip for strong Wi-Fi connectivity and easy firmware updates.

The module fits neatly inside the fan’s original case and supports models like AC-RBF4, RBF6, and more. The 4-button version is plug-and-play, while the 3-button version may need basic soldering for power. It’s certified open-source hardware and designed to make your fan smarter with automation and remote monitoring.

AC Infinity AirTap T4/T6 Specifications

• MCU: Seeed Studio Xaio ESP32-C3 module
• Display: SSD1306 0.96″ OLED
• Fan Control:
  • Gen 1 Rev 1: 2x PWM Outputs
  • Gen 1 Rev 2 / Gen 2: 1x PWM Output
• Compatibility:
  • AC-RBF4-W/B, RBF6-W/B, RBFF6-B, RBF42-W/B, RBF62-W/B
• USB:
  • 1x USB Type-C port for programming
• Misc
  • Temperature Sensor: NTC thermistor input
  • Buttons:
    • Gen 1: 3 physical buttons
    • Gen 2: 4 physical buttons
• Power: 12V DC (soldering required for some versions)
• Dimensions: Fits original AC Infinity PCB slots
• Certifications: OSHWA US002672 – Open Source Hardware

The ESP32 module is preloaded with ESPHome-compatible firmware, and YAML configuration files are provided for both 3-button and 4-button models. It can be flashed via USB using standard ESPHome tools and supports OTA updates. The firmware includes support for the OLED display, PWM fan control, button inputs, and temperature sensing. It integrates natively with Home Assistant through ESPHome’s API, making setup and automation straightforward. More information can be found on the company’s GitHub repository.

AC Infinity AirTap T4 or T6 AC Unit

The ESP32 Module for AC Infinity AirTap T4/T6 is priced at $54.99 USD (regular price $59.99). It’s available in two versions, the 3-button (Rev2) and 4-button (Rev1). The current 4-button modules are sold out, with the next batch shipping on August 9, followed by another on August 19. You can pre-order now from the SiloCityLabs store and pay in 4 interest-free installments of $13.75.

Images used courtesy of SiloCityLabs