The M5Stack Gesture Unit enables touch-free interaction for lighting controls, robots, games, exhibits, appliances, and accessibility prototypes. Its PAJ7620U2 infrared optical sensor recognizes nine movements—up, down, left, right, forward, backward, clockwise, counterclockwise, and wave—and reports them through I2C address 0x73. Typical recognition occurs at approximately 5–15 cm. Reliable control depends on sensor orientation, hand speed, distance, ambient light, reflective surroundings, enclosure design, cooldown timing, and application confirmation.
Gesture Unit: Core Functions and Control
Recognize Nine Built-In Gestures
The sensor detects directional swipes, approach and retreat, circular motion, and waving without a conventional camera.
Read Gesture Events over I2C
The host polls gesture registers and maps valid events to menus, lighting, robot behavior, or other commands.
Tune Distance and Command Timing
A cooldown and state machine help prevent one movement from producing repeated commands.
Gesture Unit Applications
Touch-free lighting controls
Robot interaction
Games and exhibit navigation
Hands-free menu selection
Accessibility-focused interfaces
How to Integrate the Gesture Unit
Mount the sensor facing the expected hand path and keep the optical opening clear.
Connect it to an I2C port and confirm that address 0x73 is available.
Test required gestures across the expected 5–15 cm zone.
Map validated gestures to bounded actions and add a cooldown.
Test different users, lighting, hand speeds, and reflective backgrounds.
Gesture Unit Deployment Notes
Performance changes with distance, angle, speed, ambient light, and enclosure geometry.
The built-in gesture set is fixed; custom sequences need application logic.
Do not directly trigger hazardous motion without independent confirmation.
Strong sunlight or unsuitable covers can reduce reliability.
Provide clear feedback so users know whether a gesture was accepted.
Up, down, left, right, forward, backward, clockwise, counterclockwise, and wave
Recognition Distance
Approximately 5–15 cm
Gesture Update Rate
Typical 120 Hz, up to 240 Hz
Ambient Light Immunity Reference
Less than 100 klux
Communication
I2C, default address 0x73
Operating Current Reference
Approximately 2.2 mA
Dimensions
32.0 × 24.0 × 8.0 mm
Net Weight
4.6 g
Q: Which sensor is used? A: The unit uses the PAJ7620U2.
Q: How many gestures are supported? A: Nine built-in gestures are supported.
Q: Which gestures are recognized? A: Up, down, left, right, forward, backward, clockwise, counterclockwise, and wave.
Q: What is the recognition distance? A: Approximately 5 to 15 cm.
Q: What is the I2C address? A: The default address is 0x73.
Q: Does it use a camera? A: No. It uses infrared optical gesture sensing.
Q: Why can one swipe trigger several commands? A: The application needs cooldown or state-machine logic.
Q: Can sunlight affect recognition? A: Yes. Ambient light and reflections can affect performance.
Q: What is included? A: The Gesture Unit and one 20 cm Grove cable are included.
Q: Can gestures control hazardous machinery directly? A: No. Independent confirmation and safety controls are required.
Touch-free lighting controls
Robot interaction
Games and exhibit navigation
Hands-free menu selection
Accessibility-focused interfaces
1 × M5Stack Gesture Unit
1 × HY2.0-4P Grove cable, 20 cm
M5Stack Gesture Unit – PAJ7620U2 9-Gesture Sensor | U127
$16.90 USD
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