![]() I had commented out just about everything in my code that wasn't included in my post, but went back to completely remove everything except the setup function. On the Mega, up to 12 servos can be used without interfering with PWM functionality use of 12 to 23 motors will disable PWM on pins 11 and 12.Thanks for confirming the code, John. On boards other than the Mega, use of the library disables analogWrite() (PWM) functionality on pins 9 and 10, whether or not there is a Servo on those pins. The Servo library supports up to 12 motors on most Arduino boards and 48 on the Arduino Mega. The reference page only gives partial information: Yes, I suspect the answer is buried in the details of the servo library as to which pins a mega can use to drive servos. Maybe the servo library being written for the Uno doesn't expect these pins to be present? There is no logical reason they wouldn't work unless you broke something in your code trying to switch to those pins, or the library doesn't acknowledge those pins for some reason. So now I'm wondering why not? I don't need it for my project, but I am curious. But when I was playing around with it, I noticed the program works for A0-A9, but not A10-A15. Its the way the tutorial I was basing my code from was setup. Retroplayer: No real reason for analog vs digital. But to be sure servo.writeMicroseconds(xxxx) is the better method to use with servos if best resolution results are needed. All servos will respond to xxxx = to 1000 to 2000 range, but most will allow 'over travel' in both lower and upper values, but that is servo model specific and until you test your servo you won't know what it's largest possible physical travel limits are. There is a servo.writeMicroseconds(xxxx) command that will allow use of better servo positing command. A0 is the name of the constant, not it's value.Īctually the servo.write(degrees) is a servo library abstraction for command movement as most/many servos are capable of better resolution then 0-180 degrees. īecause A0 is an int compatible constant which was already assigned the value 54 in that code snippet I posted earlier. ![]() I don't think it makes a difference, but I thought I'd try it. ![]() But curious, why not use serial i/o? Sorry if this is a silly question.ĪWOL: I'm trying (eventually) to use the servo as a yaw vane for a UAV and I might need a angle that wasn't an integer. But out of curiosity, what keeps arduino from freaking out about A0 being used as an int?īecause A0 is an int compatible constant which was already assigned the value 54 in that code snippet I posted earlier. To start, let me just say I'm new to forums and wow. These are defined in the specific Arduino core file pins_arduino.h that is used when you select a mega board. Here is the association of analog pin names to there corresponding digital pin names: static const uint8_t A0 = 54 You should be using int PIN = 54 if wired to the A0 pin.īut better yet and to avoid errors in the future using the analog pins for digital purposes simply ![]() I believe you are associating the wrong digital pin number for the analog input pin 0 number as used in mega boards.
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