Remote SOund Navigation And Ranging(SONAR) Application with Raspberry Pi 2 in the Local Network Area(LAN)

Hello everybody, today I am here with another post. I will construct a remote SONAR application using Raspberry Pi 2, servo motor and HC-SR04 ultrasonic range sensor. In order to understand this post better, please check the previous posts that I have already written.

1 - Controlling Servo Motor using Raspberry Pi, Python (RPi.GPIO) software based Pulse Width Modulation(PWM)
2 - Using HC-SR04 Ultrasonic Range Sensor with Raspberry Pi 2

What do we need?

1 - Raspberry Pi 2

2 - HC-SR04 Ultrasonic Range Sensor
3 - Micro Servo Motor
4 - 1x1kΩ and 1x2.2kΩ Resistors
5 - Bread Board
6 - Jumper Male to Female Wires
7 - Laptop(for remote communication)

We need all the components above. But, if you want to display the results on Raspberry Pi locally, then you don't need a Laptop. However, here I will use Laptop. Because, Raspberry Pi is a small board which is used for remote applications generally.

Here is the technical description.

1 - My laptop's config(It will be the client machine):

- IP Adress:192.168.1.106
- Communication port is 9000
- Operating System: Windows 10
- This will be the client machine

2 - My Raspberry Pi's config(It will be the server machine):

- IP Adress:192.168.1.108
- Communication port is 9000
- Operating System: Raspbian Jessie Lite
- This will be the server machine

Controlling Servo Motor using Raspberry Pi, Python (RPi.GPIO) software based Pulse Width Modulation(PWM)

Hello everybody. Today I am going to talk about controlling servo motors using Raspberry Pi. A servo motor is a rotary or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. This project uses Python script, which uses RPi.GPIO library, run on a Raspberry Pi micro controller to send General-purpose input/output(GPIO) Pulse Width Modulation(PWM) outputs to a servo motor to set its angle. However, it is not an easy task since PWM period cannot be defined by the user. It is servo motor and manufacturer-specific.

For this project, I used the following items:

1 - Raspberry Pi 2 Model B
2 - Micro Servo Motor
3 - Jumper Male to Female Wires

The Raspberry Pi 2 has 40 pins and you can see the explanation of each pins below. The servo motor has three terminals. We need to connect these 3 terminals to the proper pins of Raspberry Pi.

1 - Position signal(PWM Pulses)
2 - Vcc (From Power Supply)
3 - Ground