Schematic of a Servo Motor connects to AT89C51 needed...

[chunei]

anyone can help me on this???
thanks!!!

 

[Nigel Goodwin]

Never used an AT89C51, but presumably it's the same as connecting a PIC?, simply use a common ground, and a single I/O pin (set to an output) to feed the required pulse to the servo input pin. Don't forget to provide power for the servo as well!.

 

[HarveyH42]

Being familiar with the LCD + Keypad thread...

You need to be sure about your servo's pin configuration and power requirements. A small servo of a model airplane, you can probably use the same supply as the MCU (5 volts).

The control line goes to an I/O pin, as Nigel stated, but you need to use PWM to control the servo.

 

[Nigel Goodwin]

The control line goes to an I/O pin, as Nigel stated, but you need to use PWM to control the servo.

It's rather a misleading statement saying it needs 'PWM'?, it needs a pulse between 1mS and 2mS in width, repeated every 20mS - this isn't really the same thing as PWM which is used for power and speed control, and could easily confuse someone who doesn't know the difference?.

 

[HarveyH42]

I don't know what else to call it, but it's very similar, and haven't seen it refered to as anything else. You are probably right, but calling it PWM is what I find most used to describe it, and I've been researching this a lot past few weeks. Figure if searched with google, he'd find the sites, but pretty sure he's looking for a ready made circuit diagram and program, like with the LCD...

 

[chunei]

I don't know what else to call it, but it's very similar, and haven't seen it refered to as anything else. You are probably right, but calling it PWM is what I find most used to describe it, and I've been researching this a lot past few weeks. Figure if searched with google, he'd find the sites, but pretty sure he's looking for a ready made circuit diagram and program, like with the LCD...

ya.. u r right.. Im looking for the complete schematic for the servo and then i can combined it with the Keypad & LCD...

 

[Nigel Goodwin]

Like we said, the 'complete schematic' is just a single I/O pin feeding the input of the servo' plus the power and ground connections - no components.

 

[chunei]

Like we said, the 'complete schematic' is just a single I/O pin feeding the input of the servo' plus the power and ground connections - no components.

icic... juz connect it to the I/O pins in the AT80C51?
may i knw which pins are usually connect to according to the diagram that i had post earlier?? sorry for asking lame Q again...

the image below shows my Servo pins.. got 3 wires... black, white and red..
may i know the functions of each colour?? how to connect these 3 colours to the pins in AT89C51???

my servo motor pin... >> https://www.filehigh.com/serve/2923/471605.jpg

 

[mcs51mc]

Bad picture, very very very bad picture

I suggest you first read the datasheet of that servo, then see if what is already posted match the datasheet (I bet it will ) then connect the correct wire to +5V (the red one ) ; 5V ground (the black one ) and P1.0 of your µC (the white one ) .

If you don't know what signal is needed from the µC try with a function generator first (no coding, no programming just learning how it works)