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Stop wasting GPIO pins. ButtonHub handles a rotary encoder and two tactile buttons over a simple I2C connection. Smart, debounced, and easy
ButtonHub: I2C Rotary Encoder & Input Module
Sold by Carpathian Boards
$15.02
No tax for United States [change]
Stock available: 4
The Problem: Spaghetti Wiring
We all love rotary encoders for menus and volume control. But connecting one requires 3 GPIO pins. Add two navigation buttons, and you've used up 5 pins and created a mess of wires on your breadboard. On pin-constrained boards like ESP8266 or ATtiny, this is a dealbreaker.
The Solution: ButtonHub
ButtonHub solves this by offloading the input processing to a dedicated onboard brain (ATtiny404). It reads the encoder, detects the button presses, handles the debouncing hardware-side, and serves clean data to your main microcontroller over just 2 wires (I2C).
It is designed with the Carpathian engineering spirit: clean, efficient, and built to last.
Key Features
- Minimal Wiring: Connect everything using just VCC, GND, SDA, and SCL.
- Smart Offloading: The onboard ATtiny404 (running at 20MHz) handles all the high-speed polling and debouncing. Your main loop stays clean.
- Versatile Inputs:
- 1x Rotary Encoder (with push button)
- 2x Tactile Buttons (for Menu/Back/Select)
- Configurable: Change the I2C address or set a custom limit for the encoder (e.g., 0-100 for percentage, 0-255 for PWM) via software.
- Ready to Use: Comes with a comprehensive Arduino Library and documentation.
Why use it?
- Save GPIOs: Perfect for ESP32, ESP8266, or Arduino projects where pins are precious.
- Clean UI: Ideal for building menus, parameter adjustment interfaces, or media controllers.
- Reliable: No more "bouncy" inputs or missed encoder steps.
What's in the box?
- 1x Assembled ButtonHub Module
- (Optional: Pin headers if you include them)
Technical Specs
| Parameter | Value |
|---|---|
| Interface | I2C (Default Address: 0x10) |
| Operating Voltage | 3.3V - 5.5V |
| Processor | ATtiny404 @ 20MHz |
| Dimensions | 40mmx25mm |
What makes it special?
Unlike simple breakout boards, ButtonHub is a "smart" device. It doesn't just pass signals; it processes them. The dedicated MCU ensures that you never miss a tick on the encoder, even if your main microcontroller is busy with Wi-Fi or heavy calculations. Plus, the custom library makes integration seamless—you get clean "pressed" or "value" states, not raw noisy signals.
Links to code and documentation
Product HS Code: 853710
Shipping policy
Shipping from Brașov, Romania. 🇷🇴
Processing Time: All orders are packed and dispatched within 1-2 business days.
Destinations: We currently ship to Romania and European Union (EU) countries. Note: We do not ship to USA or Worldwide at this moment.
Methods & Delivery Times:
Romania: Courier (24-48h) or Post (2-4 days).
European Union: Romanian Post Priority Airmail (Tracked). Estimated delivery: 5 - 10 business days.
