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maissa
Joined: 17 Feb 2012
Posts: 8
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| Servo motor controller |
 Posted: Fri Feb 17, 2012 6:46 pm |
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Hi everyone,
I have to control a servomotor with two buttons, one to turn right and the the other to turn left. I'm using 18f2550. I began programming but it doesn't work, would you help me plz. This is my work:
| Code: |
#if defined(__PCH__)
#include <18f2550.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#define TIME 4
#define AV 40
#define AR 20
#define STOP 30
#define PORT_sevo1 PIN_B0
#use fast_io(a)
#use fast_io(c)
//declaration des bouttons poussoirs
#define RA0 Pin_A0
#define RA1 Pin_A1
#define WDT_18MS 360
#endif
int16 compteur1;
int compteur2,sens_servo1;
int1 signal;
#int_rtcc
void main_int(){
set_timer0(TIME);
if(++compteur1==360){
compteur1=0;
compteur2=0;
signal=1;
output_high(PORT_sevo1);
}
else{
if(signal==1){
if(compteur2++ == sens_servo1){
signal=0;
output_low(PORT_sevo1);
}
}
}
}
void init_timer()
{
set_timer0(TIME);
setup_counters( RTCC_INTERNAL, RTCC_DIV_2 | RTCC_8_BIT);
enable_interrupts(INT_RTCC);
enable_interrupts(GLOBAL);
}
void main() {
sens_servo1 = STOP;
init_timer();
set_tris_a(0x0f);
set_tris_c(0x0f);
setup_adc_ports(NO_ANALOGS);
while (true)
{
if((input(Pin_A0)==0)){
sens_servo1=AV;
}
if((input(Pin_A1)==0)){
sens_servo1=AR;
}
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Feb 17, 2012 9:15 pm |
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If you are using a hobby servo (for R/C control), you can use the
CCS driver file, servos.c. Here's an example program which uses it:
http://www.ccsinfo.com/forum/viewtopic.php?t=34560&start=22
Your code is looking for a logic low level (0) when you press the switches.
Do you have pull-up resistors on the input pins for switches ? You need
them. You can use 4.7K resistors. |
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maissa
Joined: 17 Feb 2012
Posts: 8
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| Posted: Sat Feb 18, 2012 6:32 am |
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Thanks for your answer, but i need more help, this is my dns file, will you plz help me how can i control the push buttons, what condition will i use?
Is this false?
| Code: |
while (true)
{
if((input(Pin_A0)==0)){
sens_servo1=AV;
}
if((input(Pin_A1)==0)){
sens_servo1=AR;
}
}
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temtronic
Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario
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| Posted: Sat Feb 18, 2012 7:02 am |
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Looks like another Proteus simulation....
First you have to get the hardware correct....
1) you show two grounds !
a) Earth...switches and servo tied to it.
b) Signal... 100r and servo and _mclr.
2) xtal resistor not required
3) unknown crystal value
4) no decoupling between servo and PIC
5) PIC is unpowered( no +5 , grounds)
6) no filtering on servo power supply
7) no .1 caps at PIC power pins
8) _MCLR tied low, PIC never runs
9) SW AR_SERVO1 appears to be N/C not N/O like other switch
10) Servo signal lines not labeled
there, that's a start... |
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maissa
Joined: 17 Feb 2012
Posts: 8
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| Posted: Sat Feb 18, 2012 5:11 pm |
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I'm sorry, but its still not very clear. Can you give me a simple example of controlling a servo motor with 2 pushbuttons because i still have to work for controlling 5 others. Thank you  |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Feb 19, 2012 2:52 pm |
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Here is a sample push-button program to control the servo speed.
It has two buttons, for forward and reverse. In the test results below,
I pressed the forward button several times, so the speed goes up from
0 to 4, and then when I keep on pressing it, the speed stays at the top
limit of 4.
Then I pressed the Reverse button several times and it took the speed
down to 0, and I kept pressing it until the speed went down to the lower
limit of -4, and then I pressed it some more but it stays at the lower limit.
This is just the push-button code. You will have to add the servo control
code.
This output was displayed in a Terminal window (TeraTerm) on a PC:
| Quote: |
0
1
2
3
4
4
4
4
4
4
3
2
1
0
-1
-2
-3
-4
-4
-4
-4
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Here's the program. The button.c code is at the following link:
http://www.ccsinfo.com/forum/viewtopic.php?t=23837
| Code: |
#include <18F4520.h>
#fuses INTRC_IO,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4M)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
// These are the "Bvar" variables.
int8 A4 = 0; // For the push-button on pin A4
int8 B0 = 0; // For the push-button on pin B0
#include <button.c>
#define MAX_FORWARD_SPEED 4
#define MAX_REVERSE_SPEED -4
//======================================
void main(void)
{
signed int8 speed;
speed = 0;
while(1)
{
// Push the button on pin B0 to increase the forward speed.
if(button(PIN_B0, 0, 50, 10, B0, 1))
{
if(speed < MAX_FORWARD_SPEED)
speed++;
printf("%d\n\r", speed);
}
// Push the button on pin A4 to reduce forward speed or
// to go into reverse, and increase the reverse speed.
if(button(PIN_A4, 0, 50, 10, A4, 1))
{
if(speed > MAX_REVERSE_SPEED)
speed--;
printf("%d\n\r", speed);
}
delay_ms(10); // button() needs a 10ms loop delay
}
} |
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maissa
Joined: 17 Feb 2012
Posts: 8
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| Posted: Mon Feb 20, 2012 2:31 pm |
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Thank you so much  |
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