Clap Swtich
Acknowledgements
I would like to thank my supervisor Mr. Duminda Wijesinghe, my partner Miss. Menasha Tilekeratne, families of the group members and Auston Management for giving their fullest support and guidance to make this project a success. If it had not been for them this would not have been possible.
So I thank you from the bottom of my heart.
Abstract
The aim of this project is to help disabled people who need constant care and protection due to their disability. This project helps them avoid accidents and inconveniences caused when handling electrical equipments.
This project helps them to operate switches on their ‘own’, for example turn on/off lights. The switch is controlled very simply. The switch turns ON at the sound of the first clap, and turns OFF at the second clap. The claps should be loud enough.
An electret microphone receives the sound of a clap, or a shout or any sound for example dropping of a box. It generates an electrical signal corresponding to the received sound. The successive transistor phase helps to amplify this signal. The system’s memory is constructed by two transistors that are cross coupled as a bistable multivibrator. One transistor would be turned ON while the other would be turned OFF, and each would continue to enforce the state of the other. The circuit will retain its state until it is disturbed by another sound. Thus, this circuit shows the simplest possible binary memory.
The system was virtually run by multisim software. This circuit can be useful to almost anybody and also protects them from electric shocks.
Table of Contents
1.0 Introduction
2.0 Solution Design
2.1 Input Transducer
2.2 Amplifiers
2.3 Memory
2.4 Changing State
2.5 Output
3.0 Conclusion
4.0 Further Work
References
Appendix A
1.0 Introduction
Generates
I would like to thank my supervisor Mr. Duminda Wijesinghe, my partner Miss. Menasha Tilekeratne, families of the group members and Auston Management for giving their fullest support and guidance to make this project a success. If it had not been for them this would not have been possible.
So I thank you from the bottom of my heart.
Abstract
The aim of this project is to help disabled people who need constant care and protection due to their disability. This project helps them avoid accidents and inconveniences caused when handling electrical equipments.
This project helps them to operate switches on their ‘own’, for example turn on/off lights. The switch is controlled very simply. The switch turns ON at the sound of the first clap, and turns OFF at the second clap. The claps should be loud enough.
An electret microphone receives the sound of a clap, or a shout or any sound for example dropping of a box. It generates an electrical signal corresponding to the received sound. The successive transistor phase helps to amplify this signal. The system’s memory is constructed by two transistors that are cross coupled as a bistable multivibrator. One transistor would be turned ON while the other would be turned OFF, and each would continue to enforce the state of the other. The circuit will retain its state until it is disturbed by another sound. Thus, this circuit shows the simplest possible binary memory.
The system was virtually run by multisim software. This circuit can be useful to almost anybody and also protects them from electric shocks.
Table of Contents
1.0 Introduction
2.0 Solution Design
2.1 Input Transducer
2.2 Amplifiers
2.3 Memory
2.4 Changing State
2.5 Output
3.0 Conclusion
4.0 Further Work
References
Appendix A
1.0 Introduction
Generates