Servo library limited range

Other Hardware Motors, Mechanics, Power and CNC
1

hi
just an FYI: did you notice that the servo library will cut off the range even if you force the writeMircoseconds? it will not do a full 500 to 2500 range.

2

The normal range for a servo signal is between 1000 and 2000 microseconds so why are you surprised that it will not do 500 to 2500 ?

3

i have some really expensive special RC high power servos where the manufacturer tells me to use 500-2500 for the entire range which I really need. I sent them back already thinking there was a problem. I expect the library to do what you tell it so if I say writeMicroseconds 500 I want 500 not some cutoff signal. same at 2500. found out the servo even goes to 2600. I just use my own signal generator script then that works.

4

I expect the library to do what it is designed to do

What have you got the max and min pulse width values set to in the attach() for the servo

5

Forego a servo library.

6

From Servo.h
attach ( pin, min, max ) - Attaches to a pin setting min and max values in microseconds
default min is 544, max is 2400

Try
myservo.attach(servoPin, 500, 2600);
Leo..

7

Ok tried it. still doesnt work correctly

8

You can try editing the servo.h file with notepad++
On my win11 machine it's in Program Files (x86)/Arduino/libraries/Servo/scr

#define MIN_PULSE_WIDTH       544     // the shortest pulse sent to a servo  
#define MAX_PULSE_WIDTH      2400     // the longest pulse sent to a servo 
#define DEFAULT_PULSE_WIDTH  1500     // default pulse width when servo is attached
#define REFRESH_INTERVAL    20000     // minimum time to refresh servos in microseconds

Leo..