Hi! I have been working with the servo library and I found an strange behaviour. For example, writing the position 120 will return in the read() method a 119. Writing a 121 will return in the read() 120... So I think it is not working properly as it is returning systematically the write value -1. The Arduino documentation states that the read() method will return the previous value set in the write() function.

Here is a simple example:

#include <Servo.h> 

Servo servo;

void setup(){
  Serial.begin(115200);
  servo.attach(D2);
}

void loop() {
  servo.write(120);
  Serial.println(servo.read());
  delay(5000);
  servo.write(121);
  Serial.println(servo.read());
  delay(5000);
}

The output result is like the following:

119
120
119
120
119
120
119
120

Meanwhile the expected value is

120
121
120
121
120
121
120
121