Technical Specifications
Microcontroller
ATTiny85
Input
Electret Microphone
Control Modes
2, 3, 4 Claps + Manual
Power Output
Up to 1000W AC Load
Project Overview
A novel hands-free fan speed controller using clap gestures. The "Clap Of Thing" (COT) system detects 2, 3, or 4 claps to set predefined speeds or enable manual potentiometer control via TRIAC phase modulation.
Key Features
2 Claps → Speed Level 2
Medium fan speed activation
3 Claps → Speed Level 3
High fan speed activation
4 Claps → Manual Mode
Enables fine control via potentiometer
Achievements
Introduced COT — Intuitive Gesture-Based AC Control
Key Learnings
Clap Signal Processing
Implemented robust clap detection with noise filtering on limited-resource ATTiny85.
TRIAC Phase Control
Mastered zero-crossing and phase-angle modulation for smooth AC load control.
Compact PCB Design
Optimized circuit layout for minimal footprint and reliable high-voltage isolation.
Target Audience
- Embedded systems & IoT enthusiasts
- Home automation hobbyists
- Electronics students and educators
- Accessibility and inclusive design advocates
Applications
- Smart ceiling fans
- Voice-free appliance control
- Elderly & disability-friendly interfaces
- Educational power electronics kits