Hi, I'm curious why someone would use the Arduino motorshield, rather than building either a transistor H-Bridge, with a seperate power supply for a dc motor, or using relays to separate the power supply for a servo motor. Is it just easier, or part of the Arduino system? I've noticed the heat sink on some of them. I've never used this to power motors. Generally speaking, am I missing out, by not using the motor shield?
Oh!, and additionally, how much current is required to pulse a servo with PWM. Assuming a series of motors are all expected to move in exactly the same way, couldn't I use one arduino pin to send pwm to all the motors at once?