is it possible to power both apm and servos with a USB cable? I mean by connecting the apm board to the computer? I tried to control the servo but it seems like it doesn't work. Is it because of the lack of power supply by the USB? The followings are the code that i found on the web to control the servo.
Servo myservo; // create servo object to control a servo
// a maximum of eight servo objects can be created
int pos = 0; // variable to store the servo position
void setup()
{
myservo.attach(8); // attaches the servo on pin 8 to the servo object
}
void loop()
{
for(pos = 0; pos < 180; pos += 1) // goes from 0 degrees to 180 degrees
{ // in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for(pos = 180; pos>=1; pos-=1) // goes from 180 degrees to 0 degrees
{
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}
Replies
No it is not possible to power the servos via USB. The USB specification only provides about 1.5 Amp @ 5 V which would be quickly cause a overload on the host computer when multiple servos are moving.