Had code working. Added #include <Servo.h> , Then compile failed with "exit fail 1. Error compiling for board Uno.
Had another sketch with the #include <Servo.h> in the sketch and it still compiles.
What is wrong?
Thanks in advance
Please post the full sketch that produces the error and the full error message, using code tags for both
Are you sure that the error line does not actually say
#include <servo.h>
Which Arduino board are you compiling for ?
I have narrowed down the issue. It appears that if I just #include " #include <Servo.h>" and no other libraries it compiles. If I add "#include <LocoNet.h>" then it won't compile. There must be something in the LocoNet.h library that conflicts with the servo.h library. While there is lots of documentation on the servo library I can't find much documentation on the loconet library. It is a Uno board but if I change the board to a Mega I get the same error.
Think it is somekind of library conflict issue
Forgot to mention that if I have just the loconet library it compiles. Blows up just when have both.
The sketch just have the 2 include statements.
Hi @trainman. I'm going to ask you to provide the full output from a compilation.
This procedure is not intended to solve the problem. The purpose is to gather more information.
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I think I have the info you request
Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Arduino Uno"
libraries\LocoNet\utility\ln_sw_uart.cpp.o (symbol from plugin): In function `setTxPortAndPin(unsigned char volatile*, unsigned char)':
(.text+0x0): multiple definition of `__vector_11'
libraries\Servo\avr\Servo.cpp.o (symbol from plugin):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
Multiple libraries were found for "Servo.h"
Used: D:\OneDrive\Documents\Arduino\libraries\Servo
Not used: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\libraries\Servo
exit status 1
Error compiling for board Arduino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
``My Sketch has 2 lines added to the basic blank sketch
#include <Servo.h>
#include <LocoNet.h>
If I comment out either one the sketch compiles. Leave both in and it bombs
Thanks for the helpThe AT328 data sheet says that _vector_11 is the Timer1 Input Capture Vector and indeed in LocoNet.h ReadMe I see
This library uses TIMER1 & ICP (UNO)
The Servo.h library for Arduino uses Timer1 for generating the necessary pulse-width signals to control servos. This creates a conflict with Timer1's Input Capture Event feature.
Try using a library called ServoTimer2.h which uses Timer2 and avoids the conflict. It is available through the library manager.
Big THANK YOU!'
I compiled with the ServoTimer2 library and no error. I am hoping that the function calls to the library are the same as the Servo library. I will test out today hopefully.
If that works I will add a second turnout to the sketch and add to my train layout.
Thanks again
Well the saga continues. Something is amiss. ServoTimes2 must not have the same functions as Servo.
If I type in this sketch it compiles and the servo moves back and forth:
#include <Servo.h>
Servo myservo;
void setup() {
// put your setup code here, to run once:
myservo.attach(5);
}
void loop() {
// put your main code here, to run repeatedly:
myservo.write(0);
delay(1000);
myservo.write(120);
delay(1000);
}
if I simply change <Servo.h> to <ServoTimer2.h> it compiles but the servo does not move back and forth
I also noticed that when Servo is used it is highlighted in red in the sketch whil when ServoTimer2 is used it is not highlighted in the sketch. Not sure why that happens either.
The write() function in the ServoTimer2 library expects a value for the required pulse width in microseconds as its parameter rather than the target angle in degrees. It is analogous to the writeMicroseconds() function in the normal Servo library
Try values between 1000 and 2000 microseconds in your sketch
Don't worry about the colour of keywords, they are not significant for the operation of the sketch
Tnanks for very quick reply.
That seems to get me movement.
Is there a way to convert micoseconds to an angle?
The servo is connected to a model railroad switch. In previous code that did not include the Loconet library the servo moved to the open at 68 degrees and closed at 91 degrees.
Or is there another alternative servo library that does not use timer1?
Thanks in advance
Meant to end message with "Or is there another alternative servo library that does not use timer1 and writes in degrees?"
To convert angles to a pulse width in microseconds you need to know a number of things
- How many degrees can the servo move through bearing in mind that it may not be able to move through 180 degrees
- What range of microsecond values is associated with the move ment of the servo from one extreme to the other
- Given those values you can derive a formula to convert degrees to microseconds
In a perfect world the range of microsecond values would be 100 to 200 for 180 degrees of movement but you are not in a perfect world
The standard Servo library actually calls writeMicroseconds() after doing the calculation like this
value = map(value, 0, 180, SERVO_MIN(), SERVO_MAX());
}
this->writeMicroseconds(value);
In practice it is probably easier to find the required microsecond values for required angles by experimentation as it may be different for different servos
Thanks. I think I can figure it out using your logic.