2B-TOILET BUSY INDICATION
THE SPECIALITIES OF PROJECT
This is a useful project for the office ,house ,theatre ,railway station etc. Generally the door of the toilet is knocked to check the presence of anybody in the toilet. This is not a good practice. Through this project the condition of busy toilet can be displayed (IN/OUT).
TECHNICAL DESCRIPTION AND WORKING OF THE PROJECT
This project has been developed and tested by our readers and sent to the “T.V.Engineers Technical lab” for publication in the book. The spare parts and PCB of the projects published in the series of our book publication or available in the market. The information of project code is given in the first and last page of the books.
IC CD4011 is used in the circuit. Two transistor T1 SL100 and T2 BC547 are also used to give proper voltage for the LEDs. The working system of project is very simple. Two NAND Gate of IC CD 4011 are used. Clock pulse is obtain with these gates. In the beginning the Pin No.1 of the Gate A is grounded with R1 100Ohms Resistance. The circuit stops giving oscillation and output of Gate A goes high. Now transistor T1 starts working and display shows one. It means that there is nobody inside the Toilet.
When anybody presses switch S1 which is connected from inside the door with the bolt then bolt is locked the switch gets shorted. Due to this positive voltage start going to the Pin No.1 of Gate A. Now due to oscillation it generates the necessary pulse and display 2 also starts glowing. In the Display 1 green LED and in the Display 2 red LED is connected. It shows the image of the person.
PRECAUTIONS WHILE MAKING THE PROJECT
- Take care of cathode and anode side of the diode while soldering.
- Take care of the polarity of the IC while connecting electrolytic capacitor in the circuit.
- Take care of collector ,emitter and base of transistor while connecting in the circuit.
- Check all components with meter while making the project.