Thursday, January 15, 2015

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


Servo motor with microcontroller
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.

Read this

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
Create new project in proteus 8


How to find parts from Proteus
How to find parts from Proteus
How to find parts from Proteus Library
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]
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]
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  
5:  ADCON1 = 0x0F;  
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
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 hex file to microcontroller in proteus
How to load source hex on  microcontroller in proteus
Now just run the project.

Result :

Servo Motor Interfacing With PIC Microcontroller Proteus Simulation

Servo Motor Interfacing With PIC Microcontroller Proteus Simulation


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Thank You! 

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