servo motor for a quad robots (4x4)

Forum 2005-2010 (read only) Hardware Interfacing
2

hi

Hi,
I try to find a continuous rotation servomotor. I only find this one:
http://www.active-robots.com/products/motorsandwheels/servo-motors.shtml. The others Hitec, futaba need to be modified for the 360 rotation :-/

Modifying servos for continuous rotation is easy. Check around on the net, there are lots of pages.

  1. Do you think these servomotors are enough to bring a laptop on the quad ?

Probably not. You'll have to carry the laptop and a big battery for the servos too.

  1. How many servomotor like this, I can control with the arduino ?? 13 ??

There is a library in the Playground ( for the Atmega8) that lets you control many, i think up to 10.

  1. I would like as know the difference a servomotor and a digital servomotor ? Is it the same connection with the arduino?

for R/C servos, there's no difference.

  1. Pwm is for dc motor ?

PWM is a series of pulses in varying widths. R/C servos use PWM at a set frequency to control the servo position. You could also send PWM from an Arduino to control a motor driver chip like the L298.

D