Clap Operated Notice Board

Clap Operated Notice Board

National Institute of TechnologyMeghalayaBy Abu Bakker Siddik & Ajeet Kumar SinghUnder the Guidance of Dr. Kamalika Datta

IndexIntroductionMotivationWorking principleBlock diagramCircuit diagramCodePracticalAdvantages & ApplicationsImplementationReferences

IntroductionWhat is a clap operated circuit?

A clap operated circuit is one which switches on and off electrical appliances with sound of clapping hands.

Any electrical appliance such as a fan, light, music system etc. has can be operated using this circuit.

Introduction contIt uses an electret microphone as a transducer for converting a clapping sound into an electrical signal.

It based on sound sensor which detects sounds from the environment and processes the sound with the help of Microcontroller and performs appropriate tasks as desired.

MotivationWhy do we require a sound sensing circuitry?

Working PrincipleThe clap switch requires a transducer at the input to convert sound vibrations from clapping hands into electrical energy.

An electric microphone or simply mic is used for this purpose.

The output from the mic is very low in magnitude and so we need an amplifier circuit to boost the detected sound signal.

Block DiagramSTEP 1The transducer(Mic) takes input from the environment and converts the energy(in our case) to electrical signal which is low in magnitude.

STEP2Amplifier amplifies the low magnitude electrical signal from the Transducer.

STEP3The Microcontroller further processes this amplified electrical signal.

Circuit Diagram

Vout

Code

Practical

Advantages & ApplicationPrevention from electric shockCan be implemented to ease access for physically disabled peopleCan be used for detecting trespassers and initiate a security lockdown protocolCan be implemented in a Notice Board, particularly in digital notice boards

Implementation TheClapperis a sound activated electricalswitch ,sold bySan Francisco, CaliforniabasedJoseph Enterprises, Inc

ReferencesVideos:https://www.youtube.com/watch?v=mgQLSAtS-zQhttps://www.youtube.com/watch?v=5d3468IZKtkOther references:Wikipediahttp://embedded-lab.com/blog/?p=6439

Thank Youfor your Attention