how to interface . . . . ??? - Electronic Circuits Projects Diagrams Free

nasleh2 · 25th November 2007, 12:12 PM

Dear All :

I have a question :

how can i make an interface

between a PIC16f877 with two servo motors ?

and

From where can i get a motor with torque

can load approximately 500 gram , with 70 rpm ?

Diver300 · 25th November 2007, 12:46 PM

PICs will drive servomotors directly. You need a program that will output a pulse about 0.5 - 1.5 ms long, every 20 ms. 0.5 ms will give one end of travel, 1.5 ms the other end.

The voltage levels output by a PIC running on 5V are just right to drive a servo.

Power for the servo is 5V and is left on all the time, not controlled by the PIC.

Mike, K8LH · 25th November 2007, 05:12 PM

Isn't a Servo pulse typically 1.0 to 2.0 msecs long with a 1.5 msec pulse placing the Servo in the "middle" of its travel?

Leftyretro · 25th November 2007, 07:42 PM

Yes, of course it is 1-2 msec. Also I'm not sure a R/C type servo is correct for what the OP was asking for as he specified a 70 rpm speed and unless a R/C servo is modified it will not turn continously.

There is a difference between a servo motor (one element of a servo system) and a R/C servo device (a self contained servo system).

Lefty

**Nigel Goodwin** · 25th November 2007, 08:46 PM

Quote:

Originally Posted by Leftyretro

Yes, of course it is 1-2 msec. Also I'm not sure a R/C type servo is correct for what the OP was asking for as he specified a 70 rpm speed and unless a R/C servo is modified it will not turn continously.

There is a difference between a servo motor (one element of a servo system) and a R/C servo device (a self contained servo system).

Yes, basically there's far too little information in the original question.

nasleh2 · 26th November 2007, 08:02 AM

thanks to all,

but my quistion was about interfacing not programming.

How can i konw required elements such as resistors,inductors and capacitors needed?

and i know that i have to put Hbridge . . . . .

BUT HOW TO INTERFACE BETWEEN PIC AND MOTORS CIRCUITLY ?

erosennin · 26th November 2007, 08:34 AM

You consult the master... and it tells you the following...

http://www.rentron.com/SerialServo.htm

http://www.oceancontrols.com.au/moto...controller.htm

http://www.rentron.com/PICX5.htm

Some say that he thought Star Wars was a documentary... all we know is, he's called The Google...

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25th November 2007, 12:12 PM	(permalink)
nasleh2	how to interface . . . . ??? Dear All : I have a question : how can i make an interface between a PIC16f877 with two servo motors ? and From where can i get a motor with torque can load approximately 500 gram , with 70 rpm ?

25th November 2007, 12:46 PM	(permalink)
Diver300	PICs will drive servomotors directly. You need a program that will output a pulse about 0.5 - 1.5 ms long, every 20 ms. 0.5 ms will give one end of travel, 1.5 ms the other end. The voltage levels output by a PIC running on 5V are just right to drive a servo. Power for the servo is 5V and is left on all the time, not controlled by the PIC.

25th November 2007, 05:12 PM	(permalink)
Mike, K8LH	Isn't a Servo pulse typically 1.0 to 2.0 msecs long with a 1.5 msec pulse placing the Servo in the "middle" of its travel?

25th November 2007, 07:42 PM	(permalink)
Leftyretro	Yes, of course it is 1-2 msec. Also I'm not sure a R/C type servo is correct for what the OP was asking for as he specified a 70 rpm speed and unless a R/C servo is modified it will not turn continously. There is a difference between a servo motor (one element of a servo system) and a R/C servo device (a self contained servo system). Lefty __________________ Measurement changes behavior

26th November 2007, 08:02 AM	(permalink)
nasleh2	thanks to all, but my quistion was about interfacing not programming. How can i konw required elements such as resistors,inductors and capacitors needed? and i know that i have to put Hbridge . . . . . BUT HOW TO INTERFACE BETWEEN PIC AND MOTORS CIRCUITLY ?

26th November 2007, 08:34 AM	(permalink)
erosennin	You consult the master... and it tells you the following... http://www.rentron.com/SerialServo.htm http://www.oceancontrols.com.au/moto...controller.htm http://www.rentron.com/PICX5.htm Some say that he thought Star Wars was a documentary... all we know is, he's called The Google... __________________ What is a joule per second?