weihong WROTE:I'm recently doing my final year project! Need to control 2 servo to move according to certain degree! And now facing a huge problem!
If you need to move according to certain degree, you cant use a modified RC servo which can rotate 360 degree. You'll need a standard RC servo. Please explain further about your project so that forumers here are clear on what you want to do and give more constructive advice.
weihong WROTE:1. Cant find a servo motor that can turn 360 degree or 360 degree continuously in cytron! ( but can get 1 in parallex)-Continuous Rotation Servo (#900-00008)
Cytron's 360 degree RC servo:
http://www.cytron.com.my/viewProduct.php?pid=AxcTKS8LHDU9KjsyNCQmDAsHj6a2W18oVENVYqrweW8=&store=This product is different from Parallax's continuous rotation servo. For parallax, you still need to generate precise pulses to control the rotation speed and direction. With Cytron's C36S (360 Degree), you can control it using normal H-bridge circuit or MD10B DC motor driver because there's no more servo circuit inside this C36S (360 Degree). So it depends on which method you want to use to control your "modified RC servo".
weihong WROTE:2. Cant find a servo motor driver that control 360 degree servo motor!
C36S (360 Degree): Construct simple H-bridge circuit (or use MD10B) and generate PWM to control the speed.
Parallax continuous rotation servo: Generate precise pulses to drive the servo or you may use any servo motor driver like Cytron's SC16A (16 Channels Servo Controller). But this type of driver usually support up to 8 or 16 channels. It's more than you need if you only need to control 2 motors.
weihong WROTE:3. Stepper motor is my 2nd choise but......i cant find a stepper motor driver that can control 2 stepper motor...only can control 1! Meaning to say if i got 2 stepper motor...i need 2 driver...it's kinda waste for me.....
Stepper motor is too difficult to control by using one controller. The algorithm is very complex and the stepping timing is very important. That's why usually one driver only support one stepper motor. The norm is we need to use 2 drivers to control 2 stepper motors. Cytron's stepper motor driver is SD02B. It can be control using both I/O pins or UART communication. Anyway, each SD02B also drives one stepper motor only.