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At first, the arduino board was suppling all the power but I noticed that the LCD display was flickering.
Due to the high power requirements, I need an external power source. A 9 volt battery will be powering the audio amplifier, which means the speaker will be even louder than before. 4 AA batteries(about 5 volts) will power the servo motor. The arduino will only be powering the LCD display and the ultrasonic sensor. With this setup, the LCD display is no longer flickering!
Features:
- an ultrasonic sensor, mounted onto a servo motor will scan for nearby objects(can detect objects up to 3 meters away!)
- the distance will be displayed on a LCD display
- once the alarm is triggered, "INTRUDER ALERT!!" will be displayed on the LCD
Parts:
- 1x ultrasonic sensor
- 1x servo motor
- 1x RGB LCD display (16 X 2)
- 1x 8 ohm speaker (0.25 watt)
- 1x 10k potentiometer
- 1x lm386
- 1x 220uf capacitor
- 1x 9v battery and a battery holder (to power the audio amplifier)
Scanner Limits
The ultrasonic sensor has a range from 2cm to 3 meters. Also, I noticed that the sensor has issues detecting corners. This is because the sound waves emitted from the sensor will bounce off the surface at an angle. Instead of going directly back to the sensor, it will then bounce off another surface, and then back. Thus it will take a lot longer for the sensor to read the sound. The longer it takes to read the sounds, the farther the distance is. Also, any object that can absorb sound(ex. sponges) will disrupt the readings.
can i see the circuit?
ReplyDeletei have do the project for this project..can i see circuit and program you? hope you can reply fast because i very want that.
ReplyDeletecan i see your circuit and program from your project.? pelease.. i have to doing this project.. you can reply my comment. my email. helmannurintan@gmail.com
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