Arduino Modulino® Buttons

Arduino Modulino^® Buttons is a user-friendly input device featuring three tactile push-buttons, each equipped with an RGB LED for customizable visual feedback. Designed for seamless integration with Arduino Uno R4 boards via the Qwiic I²C connector, this module allows users to easily implement interactive controls in projects. Each button press is detected and communicated over I²C, while the onboard STM32C011F4 microcontroller (MCU) manages LED color and brightness independently, reducing the workload on the main board. The Modulino Buttons module is ideal for projects that require user interaction, menu navigation, or quick control inputs. The modular, solderless design makes the device perfect for rapid prototyping, educational environments, and hobbyist applications.

Features

Three SPST push buttons and three onboard indicator LEDs
Integrated STM32C011F4 MCU providing an I²C interface by default
Optional SWD interface for custom firmware and advanced features
Designed for 3.3V operation via the Qwiic connector (I²C)

Plug-and-play connectivity
Effortless expansion
Seamless Arduino ecosystem integration
Ideal for user interaction and input within modular Internet of Things (IoT) or maker projects
CE/RED (Europe), UKCA (UK), FCC (USA), IC (Canada), RoHS, REACH, and WEEE certified

Applications

Interactive interfaces
Educational projects
Control panels

Specifications

STM32C011F4 MCU, 2.0V to 3.6V supply range
I²C (Qwiic), SWD (reprogramming), and UART (optional) communication
±2LSB typical INL analog-to-digital converter (ADC) accuracy
12-bit ADC resolution
3.3V nominal operating voltage via Qwiic
Typical current consumption
- ~2.5mA × 3 + ~3.4mA for push buttons + LEDs
- ~3.4mA when the MCU is idle

3x SPST push buttons
3x indicator LEDs (controlled by MCU)
Board dimensions
- 41mm x 25.36mm size
- 1.6mm (±0.2mm) thickness
- 4x ø3.2mm mounting holes
- 16mm vertical, 32mm horizontal hole spacing
-40°C to +85°C operting temperature range