Learn Embedded Programming [Step by Step]

Servo Motor Interfacing With PIC Microcontroller ( PIC18F2550 ) in Proteus [step by step]

 Servo Motor

Servo motors are very popular in the field of robotics. In this tutorial I will show how to interface servo motor with microcontroller and I will use pic18f2550 microcontroller. Basically servo motor works on PWM(Pulse Width Modulation) signal. PWM has  great uses to produce signal  by microcontroller .
Look at the picture given below. We have to send PWM signal from 1millisecond to 2 millisecond to control the servo motor.
Remember the required frequency for operating servomotor is 50Hz and the time period is 0.02 second or 20ms. The MikroC function PWM1_Init() will not be initialized with 50Hz frequency. Actually we don't need mikroc functions to operate a servo motor. We can do it manually.

1 If we  use less or equal to 1millisecond, the motor rotates 0 degree
2 If we  use 1.5millisecond or (1500 us), the motor rotates to 90 degree
3 If we  use equal to 2millisecond, the motor rotates 180 degree
So if we like to rotate x degree, the solution becomes =[{(1500-1000)/90}*x] us. I used this and it worked successfully. Now look at the picture given below .

We know that time period is 20ms. If we would like to rotate 90 degree angle, the pulse should be 1500us ON and 18500us OFF. I think it's clear.

Now let's create a project on Proteus. If you are an expert you don't need to follow instructions. But beginner can follow these.

Proteus Circuit:

 Create new project in proteus 8

 How to find parts from Proteus
 How to find parts from Proteus Library
Now complete the circuit as i have given below.
 Servo Motor Interfacing With PIC Microcontroller (  PIC18F2550  ) in Proteus [step by step]

Now look carefully at the picture given below.
 Servo Motor Interfacing With PIC Microcontroller (  PIC18F2550  ) in Proteus [step by step]
We have completed the circuit. Now let's create a Project in MikroC because we need a program to operate the microcontroller.

MikroC Code :

#Source Code :

``````

2:  void main() {
3:  int i=0;
4:  CMCON = 0x07; // To turn off comparators
6:  Trisc=0x00;
7:  delay_ms(1000);
8:  while(1){
9:  /////// rotate to 0 degree
10:  for(i=0;i<49;i++){
11:  PORTC.F0=1;
12:  delay_us(900);
13:  PORTC.F0=0;
14:  delay_us(19100);
15:   }
16:  delay_ms(4000);  //delay for 4 sec
17:   /////// rotate to 45 degree
18:  for(i=0;i<49;i++)
19:  PORTC.F0=1;
20:  delay_us(1250);
21:  PORTC.F0=0;
22:  delay_us(18750);
23:   }
24:  delay_ms(4000);
25:   /////// rotate to 90 degree
26:  for(i=0;i<49;i++){
27:  PORTC.F0=1;
28:  delay_us(1500);
29:  PORTC.F0=0;
30:  delay_us(18500);
31:   }
32:  delay_ms(4000);  //delay for 4 sec
33:   /////// rotate to 1350 degree
34:  for(i=0;i<49;i++)
35:  {
36:  PORTC.F0=1;
37:  delay_us(1750);
38:  PORTC.F0=0;
39:  delay_us(18250);
40:   }
41:  delay_ms(4000);  //delay for 4 sec
42:  /////// rotate to 180 degree
43:  for(i=0;i<49;i++)
44:  {
45:  PORTC.F0=1;
46:  delay_us(2000);
47:  PORTC.F0=0;
48:  delay_us(18000);
49:   }
50:  delay_ms(4000);  //delay for 4 sec
51:  }
52:  }

``````
Now run the MikroC project.
 How to Create Hex file in mikroC
Now go to the proteus circuit and load the .hex file to your microcontroller .If you don't know how , follow the instructions .

 How to load source hex on  microcontroller in proteus
Now just run the project.

Result :

Servo Motor Interfacing With PIC Microcontroller Proteus Simulation

DC Motor Interfacing with PIC Microcontroller ( PIC18F2550 ) in Proteus [step by step]

 DC Motor

This tutorial will describe,  how to interface a DC motor with a Microcontroller and in this tutorial, I will use pic18f2550 microcontroller. Generally, to control a DC motor we need voltage 12v with 300mA current. Basically a microcontroller works on 5v and can't provide the current follow to operate a DC motor.As we know a motor can produce back emf, we need other technique to operate .The solution will be a H-Bridge circuit or L293D ic.

 H-Bridge Circuit
 L293D

We can operate two motors through this IC. Here pin 1 is to enable input 1(pin1)&2(pin7) for input and 3&6 pins for output. Pin9 enables 3(pin 10)&4(15) as input and 14&11 pins as output. We will connect pin2 & pin7 with our microcontroller's pin RC0 and RC1 respectively. Now, look at the picture given below.
 DC Motor Rotation Controlling

Now Create a new project in Proteus. If you are a beginner, just follow the instructions.

Proteus Circuit:

 How to Create a New Project in Proteus 8_Step1
 How to Create a New Project in Proteus 8_Step2

 How to Create a New Project in Proteus 8_Step3
 How to Pick parts from Proteus library
 How to find Power ,Ground etc
Now just complete the circuit as I have given below.

 Interface DC Motor with pic Microcontroller
Now we need source code to run this microcontroller. So let's create a project in MikroC.

MikroC Project :

 Create a project in mikroC_Step_1
 Create a project in mikroC_Step_2
 Create a project in mikroC_Step_3
#Source Code :
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void main() {
CMCON = 0x07; // To turn off comparators
Trisc=0x00;
delay_ms(1000);
while(1){
/////// Step1: Rotate Motor Clockwise
PORTC.F0=1;
PORTC.F1=0;
delay_ms(4000);   //delay for 4 sec
/////// Step2: Stop the Motor
PORTC.F0=0;
PORTC.F1=0;
delay_ms(4000);   //delay for 4 sec
/////// Step3: Rotate Motor Anti-Clockwise
PORTC.F0=0;
PORTC.F1=1;
delay_ms(4000);   //waiting for 4 sec
/////// Step4: Again Stop The Motor
PORTC.F0=1;
PORTC.F1=1;
delay_ms(4000);   //delay for 4 sec
}
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Now run the program and save the hex file on your computer .
 Run project in mikroC
Now go to the proteus circuit and load the hex to microcontroller
Run the proteus project.
 Run Proteus Project

Result :

 DC motor in Clockwise direction
DC motor in Anti-Clockwise direction

Thank You!

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