Date:11/5/2020
In this week I have decide to continue on methodology regarding my Fyp
project after done my flowchart and block diagram in previous week. Firstly, I
must know what type of sensor that are suitable to make my project successfully
can be create. My project is about sensing level water from a certain distance.
So, I decide to use ultrasonic sensor that works on the
principle of ultrasound waves which is used to determine the distance to an
object. Beside that an
ultrasonic sensor generates high-frequency sound waves. When this ultrasound
hits the object, it reflects as echo which is sensed by the receiver. By using
the time required for the echo to reach the receiver, we can calculate the
distance to an object we are targeting. Ultrasonic distance sensor consists of
two ultrasonic transducers. Among them, one
acts as a transmitter which converts the electrical pulse of microcontroller
into ultrasonic sound pulse and the receiver receives for the transmitted
pulses.
If it receives them, then it produces an output pulse whose time period can be
used to determine the distance from the object
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After
doing some research about some type of ultrasonic sensor, I decide to use
HC-SR04 sensor. HC-SR04 Ultrasonic sensor
is a 4 pin module, whose pin names are Vcc, Trigger, Echo and Ground respectively. This sensor is a very popular sensor
used in many applications where measuring distance or sensing objects are
required. The module has two eyes like projects in the front which forms the
Ultrasonic transmitter and Receiver.
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HC-SR04 Sensor Features • Operating
voltage: +5V • Theoretical
Measuring Distance: 2cm to 450cm • Practical
Measuring Distance: 2cm to 80cm • Accuracy:
3mm • Measuring
angle covered: <15° • Operating
Current: <15mA • Operating
Frequency: 40Hz |
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