IR Gesture 2 Click is a compact add-on board that provides contactless gesture recognition. This board features the MAX25405, a data-acquisition system for the gesture and proximity sensing from Analog Devices. Detection distance is improved by integrating a complete optical system with a lens, aperture, visible light filter, and a 6x10 photodetector array. The proximity, hand detection, and gesture recognition functions of the MAX25405 operate by detecting the light reflected from the controlled IR-LED light sources driven directly from the MAX25405. It can also detect these gestures even when exposed to bright ambient light and process data from the sensor through an SPI interface. This Click board™ is suitable for various gesture sensing applications, from hand swipe gestures (left, right, up, down, wave), air click, and flicks to multizone proximity detection.

IR Gesture 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

IR Gesture 2 Click as its foundation uses the MAX25405, a data-acquisition system for gesture and proximity sensing from Analog Devices. This Click board™ represents an infrared-based dynamic optical solution that can sense a broader range of motions at extended distances. The MAX25405 detects broader movement proximity and doubles the sensing range to 40cm compared to earlier generations. It recognizes the following independent gestures: hand swipe gestures (left, right, up, down, wave), air click and flicks, finger and hand rotation (clockwise and counter-clockwise), and multizone proximity detection.

Along with integrated optics and a 6x10 infrared sensor array, the MAX25405 also includes a glass lens which increases sensitivity and improves the signal-to-noise ratio. The proximity, hand detection, and gesture recognition functions of the MAX25405 operate by detecting the light reflected from the controlled IR-LED light sources (SFH 4248-VAW and SFH 4249-UV) driven directly from the MAX25405. It can also detect these gestures even when exposed to bright ambient light and process data from the sensor through a serial interface. The light source PWM duty cycle is programmable from 1/16 to 16/16, where LEDs are pulsed on one or more times in a programmable sequence repeated for every sample.

IR Gesture 2 Click communicates with MCU using the 12-bit SPI serial interface compatible with standard SPI, QSPI™, MICROWIRE™, and digital signal processors (DSPs), with a maximum frequency of 6MHz. This Click board™ also possesses an additional interrupt pin, routed to the INT pin on the mikroBUS™ socket, indicating when a specific interrupt event occurs, such as the end of a conversation sample sequence.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

• Interface: SPI
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V
• IR LED Wavelength: 940nm
• Field of View: ±30 Deg
• Resolution: 12 bits
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +85°C

• Schematic
• MAX25405 Datasheet
• SFH 4248-VAW Datasheet
• SFH 4249-UV Datasheet
• mikroSDK
• GitHub