Urgent help for servo motor forward direction

[Wahid2012]

Hey guys,

I am using pIC16F877A to control two servo motor....i need a program....where my servo motor do as following below

go forward 100cm
turn u-turn or180 degree
go forward

the loop continue for 3 times..



please help guys i have only 13 days before my presentation

 

[alberto1683]

Hi,

I will start a project with servos too.
I have started to read the following document, it is very useful for me. Take a look, it will give you an idea, for sure.

regards

 

[Wahid2012]

thx.....I had downloaded that pdf a month ago.........the problem is that i just want my servo motors move forward for 5 sec then backward, to show on my poster presentation that my circuit is working.The program i wrote. it just rotate less than 2 sec and stop.


#include <16F877A.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //Highspeed Osc > 4mhz
#FUSES PUT //Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#use delay(clock=20000000) // Sets crystal oscillator at 20 megahertz
#use rs232(baud=9600, xmit=PIN_C6, invert) //Sets up serial port output pin & baud rate



void main(){
int16 pulse_width = 1000;
int i;



while (1) {

output_high(PIN_D3);
output_high(PIN_D2);
delay_us(1500);
output_low(PIN_D2);
delay_ms(20);


}
}

 

[sky_123]

Not really an expert in PICs.. but don't you first need to program PIN_D2 as an output pin?
You need to look for a data direction register and set that bit high first, so that the
uC knows that it is an output pin.
You could check with a 'scope that pulses really are being generated.