Gesture Recognition Device Development

Capacitive Touch Sensing Principle and Application Design: 1. Touch Sensing Principle: - Self-capacitance Sensing: Detect capacitance change of touch electrode to ground - Mutual-capacitance Sensing: Detect capacitance change at row-column intersection - Human body proximity changes electric field distribution - Sensor detects capacitance changes to identify touch 2. Hardware Design: - Touch Electrode: PCB copper foil or independent electrode - Routing Design: Keep sensitive traces as short as possible - Shielding Layer: Reduce interference and improve stability - Sensor IC: Dedicated touch detection chip 3. Software Algorithm: - Baseline Tracking: Automatically adapt to environmental changes - Threshold Setting: Distinguish touch from noise - Filtering Processing: Reduce false triggers - Calibration Function: Automatic calibration at power-on 4. Design Key Points: - Sensitivity Adjustment: Adjust sensitivity according to panel thickness - Waterproof Design: Support touch with water - Anti-interference: Prevent power supply, EMI interference - Multi-key Design: Support double-key, triple-key, etc. 5. Application Scenarios: - Touch Desk Lamp: Touch switch, dimming - Smart Home Appliances: Touch button panel - Touch Screen: Smart home control panel - Toy Products: Touch sensing toys 6. BOM List: - Touch IC: TTP223, QT100, etc. - Touch Electrode: PCB design - Capacitor: 100nF filter capacitor - Resistor: Pull-up resistor

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