Mikal,
Can you explain how the old PWM works? If it isn’t interrupt based is it reliable? Are there any reasons to not use it?
I am trying to use it in a very simple example sketch to drive an RC car through and ESC and it is very erratic. I can’t seem to identify what the RC car needs to drive it reliably. I can get the wheels to turn but not in a controllable, methodical way. I learned that this library doesn’t have the writeMicroseconds method available.
Your thoughts?

desmond,

Is PWMservo the new or OLD servo library? Because i want to be able to drive a single servo while using newsoftserial.

Mikal,

COuld you please tell me where i would find information on this library. Because i need to be able to produce a PWM that i can adjust the duty cycle to drive a normal motor.
And
i need to be able to turn a normal motor 90degress in both direction.

How do i use this library to do that.

Mikal,

Is it possible to rework the PWMServo library to work on pins other than 9 and 10? I am working on a project with a duemilanove ATmega328 with a sdmicro shield using pin 10, and I have two servos that I need to control. I also have several serial devices which require the use of newsoftserial.

Thanks for any help you can offer!

-Charles

This library does not seem to have been updated to function with arduino 1.0, can we expect a fix any time soon?

Hi,

I need control 16 servos and use USB/serial port default on Arduino Uno or 2009.

Can this library help me?

Thank you,
AC

I’m trying to use the PWMservo library but the neither of the examples compile. I get the following errors:
Knob.pde:-1: error: ‘PWMServo’ does not name a type
Knob.cpp: In function ‘void setup()’:
Knob.pde:-1: error: ‘myservo’ was not declared in this scope
Knob.pde:-1: error: ‘SERVO_PIN_A’ was not declared in this scope
Knob.cpp: In function ‘void loop()’:
Knob.pde:-1: error: ‘myservo’ was not declared in this scope

Any idea on what’s wrong?

I have the same problem with Mark Grass but instead, I have the issue with SoftwareServo library from http://playground.arduino.cc/ComponentLib/Servo.
I want to control up to 8 servos with arduino UNO -> ATMEGA328P-PU so I need this functionality for non-PWM pins. Any alternative suggestion?

Hi,
I need to use only one pin to control a servo but I also need to use every single other PWM pin on my Arduino Uno. The new servo library disables PWM on pins 9 and 10, therefore I am 2 pins short on my project. I tried to use “Paul’s version 2 library”, however whenever I used the attach method onto pin 9, the PWM on pin 10 stopped working. Is their a way to control one servo and to still have PWM capabilities on ALL other PWM capable pins using this library? or is their another way to make it work?

hello guys
i have the same problem , when i attached to the motor driver shield to arduini uno , the easyvr stopped listening to my voices commands .
and you suggested using PWMServo.h instead of Servo.h but i am using AFMotor.h . is there any other library which offers same flexibility as PWMServor , for motors ???

Hi Mikal,
Best regards from France, with BRAF : Ballons Radioamateurs France
First ballooning association.
See also : http://www.radioamateurs-france.com/

Alan F6AGV – BRAF

Getting the following errors when I try and compile:

C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In static member function ‘static void PWMServo::seizeTimer1()’:
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:40: error: ‘clockCyclesPerMicrosecond’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In member function ‘uint8_t PWMServo::attach(int, int, int)’:
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:72: error: ‘LOW’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:72: error: ‘digitalWrite’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:73: error: ‘OUTPUT’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:73: error: ‘pinMode’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In member function ‘void PWMServo::detach()’:
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:95: error: ‘INPUT’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:95: error: ‘pinMode’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:101: error: ‘INPUT’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:101: error: ‘pinMode’ was not declared in this scope
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In member function ‘void PWMServo::write(int)’:
C:\Users\Mike\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:118: error: ‘clockCyclesPerMicrosecond’ was not declared in this scope

Any suggestions?

I am trying to use this with an Arduino Mega and AdaFruit Motorshield v.2 but do not seem to get it working. I am attaching 2 servos to pin 9 and 10 or 11 and 12 but have no response.

Is there anything I am missing out ?

With the PWMServo_v2 library a simple addition allows it to work nicely with the ATTiny84. Just add the following to PWMServo.h :

#elif defined(__AVR_ATtiny84__)
#define SERVO_PIN_A 6
#define SERVO_PIN_B 5

Hello, I have the error how Touchstone:

This report would have more information with
“Show verbose output during compilation”
enabled in File > Preferences.
Arduino: 1.0.6 (Windows 7), Board: “Arduino Uno”
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In static member function ‘static void PWMServo::seizeTimer1()’:
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:40: error: ‘clockCyclesPerMicrosecond’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In member function ‘uint8_t PWMServo::attach(int, int, int)’:
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:72: error: ‘LOW’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:72: error: ‘digitalWrite’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:73: error: ‘OUTPUT’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:73: error: ‘pinMode’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In member function ‘void PWMServo::detach()’:
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:95: error: ‘INPUT’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:95: error: ‘pinMode’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:101: error: ‘INPUT’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:101: error: ‘pinMode’ was not declared in this scope
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp: In member function ‘void PWMServo::write(int)’:
C:\Users\myuser\Documents\Arduino\libraries\PWMServo\PWMServo.cpp:118: error: ‘clockCyclesPerMicrosecond’ was not declared in this scope

I use the newest version of PWMServo.

Please help.

Regards Torsten

After a few years of being idle, I am back on working on my own Reverse Geocache. However, Arduino has changed a lot since than and I have upgraded to a PC running Windows 8.1. I was working with Arduino 18 or so back then on a XP machine. I had trouble with servo stability.

Starting over with: reverse_geocache_sample_for_rev_2_shield.ino
Sample Arduino Puzzle Box sketch Written by Mikal Hart and downloaded from Sundial.

I downloaded the Version 2 PWMServo Library from this site and when I attempt to compile my sketch it is looking for a wiring.h file. apparently from searching the Internet, things have changed since this library was created.

Exact error:

Arduino: 1.6.1 (Windows 8.1), Board: “Arduino Uno”

C:\Program Files (x86)\Arduino\libraries\PWMServo\PWMServo.cpp:2:20: fatal error: wiring.h: No such file or directory

#include
^
compilation terminated.

Error compiling.

=====

Where do I go from here?

Titus

Never mind on my post a couple of days ago. For some reason I had the wrong version of PWMServo installed. Went through it again and the sketch now compiles.

Thank you. Thank you. Thank you.

I am new at this. I followed all the instructions to the best of my ability, but when it came down to downloading the sketch into the GeoCache box, the following message displayed:

Arduino: 1.6.4 (Windows 8.1), Board: “Arduino Uno”

reverse_geocache_sample_for_rev_2_shield.ino:43:22: fatal error: PWMServo.h: No such file or directory
compilation terminated.
Error compiling.

This report would have more information with
“Show verbose output during compilation”
enabled in File > Preferences.

I have been trying to use the PWMServo (ver 2) on an ATtiny84. I’ve made the suggested changes to PWMServo_v2 for the servo pins but I get no servo movement. Compiles fine. I put a LED on/off at the end of the sweeps example and that seems to indicate code is running. I’ve tried hooking servo to all pins just in case my Attiny core is defining pins differently but no change. Incidentally, the code works just fine on my UNO.l

The Servo.Attach function is causing the servo to move for about 30°.
For the standard Servo.h library I’ve found a solution in the www on how to prevent the servo from a first move (using it for a locking mechanism – and 30 degrees are sufficient to unlock)
Tried as well:
servoblau.attach(9, 400, 2400);

According to h-file it should do
uint8_t attach(int pinArg, int min, int max);
// attach to a pin, sets pinMode, returns 0 on failure, won’t
// position the servo until a subsequent write() happens
// Only works for 9 and 10.

Thought the problem might be:
uint8_t PWMServo::attach(int pinArg, int min, int max)
{
//Serial.printf(“attach, pin=%d, min=%d, max=%d\n”, pinArg, min, max);
if (pinArg = NUM_DIGITAL_PINS) return 0;
if (!digitalPinHasPWM(pinArg)) return 0;
pin = pinArg;
analogWriteFrequency(pin, 50); // default movement????

I implemented writeMicroseconds method for PWMServo: https://github.com/vakhrymchuk/PWMServo