The automatic IN/OUT indicator with doorbell uses a touch switch activated by a metal plate or key to automatically change the display between "IN" and "OUT" based on occupancy. It also integrates a doorbell that only rings when the status is changed by a guest, avoiding unwanted energy usage. This eco-friendly project was developed under guidance using recycled materials and can benefit homes, offices, schools and more by streamlining notifications of arrival and departure.

1. Automatic IN/OUT Indicator with Doorbell

2. This project is done under the guidance of professionals
and using safety measure in due course. No biotic or abiotic
resources is hurt or wasted during the very session.
This project is done using eco-friendly recycled
or less pollutant substances. The main motto of this
project is to have proper grasp of sustainable
development among young aspirants
including me.
Thanks, Presenter.

3. Topics Slide No.
Introduction- Revision ---------------------------------- 5
Block Diagram---------------------------------------------- 6
Circuit Diagram-------------------------------------------- 7
Working Principles--------------------------------------- 8
Components----------------------------------------------- 9
 The Practical Model-------------------------------------- 10
Inside the Model------------------------------------------ 11
Output Result----------------------------------------------- 12
Proposed Applications---------------------------------------- 13
References-------------------------------------------------------- 14

4. The Project at a glance – A quick review & revision
In general whether a person is ‘in’ or ‘out’ is indicated through a cardboard indicator which has
to be turned for each arrival or departure.
Instead of this,
electronic indicators can also be used. However, these also need to be set for changing the
display.
Therefore, we are trying to solve this mater by our proposed device and its application.
.

5. Fig.1: Block diagram for the automatic in/out indicator with door-bell.

6. 1. PCBs
2. Touch Plate
3. Multimeter
4. Soldering wire & wax
5. Battery
6. Connecting wires
7. Soldering Iron
8. Resistors
9. Capacitors
10. Transistors
11. ICs
12. Speakers
13. 7-segment Display

7. Fig. 2: Circuit diagram for the automatic in/out indicator with door-bell.

8. THE INDICATOR
The circuit works on the basic principle of a touch switch. The input of the circuit carries a
touch plate (key plate).
When power supply is switched on, the display shows ‘IN’.
When you leave home you take the key & the metal plate is touched & so touch switch is
enabled. Therefore the display is changed to ‘OUT’.
When you reach home, you place the key on the plate. And again, the touch switch is
activated and the display is flipped to ‘IN’.
THE DOORBELL
If you are inside then a press on the switch displays ‘IN’ and sounds a bell inside the home for
each press of bell switch.
If you are out then a press of the switch will display ‘OUT’ and the bell will ring inside.
It displays ‘IN/OUT’ only when a guest presses the calling bell switch. This will avoid unwanted
wastage of energy.

12. THE INDICATOR CUM DOORBELL CAN BE USED IN
HOMES
OFFICES
CHAMBERS
SCHOOLS

13. Books & Magazine :
❶Electronics Projects Vol. 24 – EFY Enterprise Pvt. Ltd.
❷Simple Projects – EFY Enterprise Pvt. Ltd.
❸Electronic Gadgets 2nd Edition – McGraw Hill Education.
Web Helps :
❶http://www.electronicshub.org
❷http://www.electronicsproject.org