Accuracy of the sensor

Below is the result of the accuracy of the ultrasonic sensor

1. water level at 0

2. water level at 5

3. water level at 10

4. water level at 15

5.water level at 20

Attachment of the LabVIEW software

After calibrating the ultrasonic sensor and it's well functioning, we can attach the sensor and the water pump to the software. The picture below show the water tank system that being attached to the LabVIEW software.

Result of the accuracy of the ultrasonic sensor

The result of the accuracy of the ultrasonic sensor as below :

Height (cm) TANK	Height (cm) LabVIEW
0	-0.8601
1	0.9896
2	2.108
3	2.981
4	4.036
5	5.001
6	5.963
7	7.124
8	8.049
9	9.218
10	10.17
11	11.12
12	12.30
13	12.93
14	14.23
15	15.34
16	16.09
17	16.92
18	18.06
19	19.44
20	20.00
21	21.28

Calibrating the sensor

firstly, before implement the LabVIEW software, The ultrasonic sensor need to be calibrate. To calibrate the sensor, we use oscilloscope to test the accuracy. The picture below is the oscilloscope square wave result obtained :

obtained result of accuracy

attachment of the sensor:
the sensor ranging is from 2cm to 4 cm. after do some calibration, the best height of the ultrasonic transducer is 20cm from the top of the main tank

sensor attached at the top of the main tank

DC voltage controller

The DC motor speed control in this project is to control the speed of dc motor that used to pump the water into the tank from the reservoir tank. As the motor can pump in 3785.41 liters per hour, we need to control the water pump as we want to do research about the accuracy of the ultrasonic sensor. The speed of the pump need to be control because we want the pump to be automatically pump the water in and to stop pump in at desired level of the tank.

To control the water pump, we use Darlington transistor, TIP 120. The TIP120 is an NPN Power Darlington Transistor. The TIP120 acts as a power broker or gatekeeper between the the high power realm composed of the water pump and its dc 12volts supply

TIP 120 diagram

basic circuit for controlling dc pump :

basic circuit for TIP120

full circuit layout :

TIP 120 circuit controlling the dc waterpump