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Ultrasonic Sensor is a sensor that can measure the distance between the sensor and the object using echolocation i.e the principle which bats use.
OLED Display is a component that can display images and words clearly. I have used a 128 x 64 display.
In addition to this, we need:
A water jug
Ultrasonic sensor VCC to 5v of Raspberry Pi
Ultrasonic sensor Gnd to Gnd of Raspberry Pi
Trigger to GPIO 2
Echo to GPIO 3
Buzzer + to GPIO 4
Buzzer – to Gnd
· Attach a scale to the bucket.
· Next attach the buzzer and ultrasonic sensor to the scale