It's a doorbell! When you press it, you'll hear it ring and a small led will tern on
used software
small bread board
is used for building circuits, and demonstrating its action
is used for building circuits, and demonstrating its action
to connect two points to each other and make the circuit closed
9 volt adaptor
to provide a power source for my electronic device
220 ohm resistor
to reduce current flow, and divide voltages
the outputs I used are LED and buzzer
LED
OUTPUT: to see who is by the door
BUZZER
OUTPUT: to be the door bell
crafting tools
we need some material to aid us in enclosure such as: -cardboard -glue gun -cutter -scissors - plastic cups
the circuit connection
here is the final wiring, I used color coding, red for positive and black for negative. I used an LED and buzzer as output are connected parallel with power, and the input is a slide switch, and sure connect a resistor to avoid LED burning
As you can see, I connected the LED and the buzzer in parallel, and I connected the on/off switch to the positive side. i used the 9v adaptor to be the power supply as the LED voltage is 3 v and the buzzer voltage is 5v
I made a box that looks like a door. I cut a hole for the buzzer and made a hole in the middle for the LED light. I painted the box and added some decorations. After that, I fixed the circuit at the back of the box. I also adjusted the ON OFF switch to be the bell and the LED in the middle. This helps the user see who is at the door.
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I had a problem when I used the 5V power supply. The buzzer made a very quiet sound. But when I tried the 9V power supply, the buzzer made a much louder sound.
THE KEY OF SOLUTION IS trial and error
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