[SOLVED] how to program to rotate 3 pin dc servo motor in anti clock wise direction using keil

[cyanpraveen]

Hello friends,

I am using AT 89s52 µcontroller to control 3 pin dc servo motor. now the problem is i cant able to rotate motor in anti clockwise.

so any one kindly help me , how to program in keil IDE to rotate motor in anti clock direction

pulse on time 18 ms and off time 2 ms.

tks in adv guys

 

[BGAman]

Hi,
assuming "3 pin dc servo motor" means classic RC servo, your control signal must be:
- period 20ms
- positive pulse 1us to 2us
- 1.5 us = neutral (center)
- 1us maximum anti clockvise
- 2us maximum clockwise
This signal can be generated by PWM (Timer) block or by software.

If it is not RC servo, please specify which servomotor.

Regards
Pavel.

 

[kalaianand]

keep the same truth table which you used for forward direction, and change the sequence of rotation.....

 

[cubanflyer]

Check out this link for the basics of an RC servo.

**broken link removed**

Be aware that is assumed that the centre point on a servo is 1.5ms, but I know of 1 manufacturer where this is 1.52ms.

 

[cyanpraveen]

thanks for ur suggestion... but i am not using any truth table for rotation.

this is wat i ve done.

count++;
{
if(count == 1)
{
LED1 = 0;
TH0 = 0xB8; //BF33 CCW
TL0 = 0x5C; //B85C CW
TR0 = 1;
count++;
// Timedelay(5000);
}
if(count == 2)
{
LED1 = 1;
TH0 = 0xFF;
TL0 = 0xA4;
TR0 = 1;
count++;

by doing this i can able to rotate in clockwise. but by repeating the same by incrementing the count i cant able to achieve counter clock