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calibrate example for Servo #49

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bb23457
callibrate example for Servo
noob-master147 Mar 25, 2020
6001753
calibrate example for servo
noob-master147 Mar 25, 2020
4b31d2e
changes requested
noob-master147 Mar 25, 2020
a928daa
bug fix for serial monitor
noob-master147 Mar 25, 2020
e69088d
Auto Format implement
noob-master147 Mar 25, 2020
8819502
bug fix for both Newline and carriage return
noob-master147 Mar 25, 2020
be98aac
suggestions considered
noob-master147 Mar 25, 2020
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21 changes: 21 additions & 0 deletions examples/Calibrate/Calibrate.ino
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Original file line number Diff line number Diff line change
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#include <Servo.h>
Servo myservo; // create servo object to control a servo
int input; // variable to read the value from the SerialMonitor
int servoPin = 11; // set the Pin on Arduino, servo is attached


void setup() {
myservo.attach(servoPin); // attaches the servo on servoPin to the servo object
Serial.begin(9600);
}

void loop() {
if (Serial.available() > 0) {
input = Serial.parseInt(); // reads the value from Serial
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With the line ending menu of Serial Monitor set to anything other than "No line ending", there is an issue. For example, if I enter 42 in the Serial Monitor input field, I get this output:

Servo set to 42 degree
Servo set to 0 degree

"Newline" is the default setting of this menu, so it's likely many users will encounter this problem.

The easiest solution would be to document the required line ending setting. Of course, many users won't read the directions, so they will still have the problem.

There is also the issue of the 1 s delay before the input takes effect. Not a huge issue, but it doesn't provide a very responsive feeling to the interface.

I explained the cause and described the fix for these issues here: #44 (comment)

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ok ill look into your suggestions

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@per1234 should I mention in the document to use no line ending or should I try improvising code to work for newline?

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@per1234 per1234 Mar 25, 2020 •
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The issue still occurs with the line ending menu set to "Both NL & CR". DONE

The reason is because serial communication is relatively slow. Serial.parseInt() returns as soon as it encounters a non-digit. So when Serial.parseInt() returns the NL has already been received, but the CR has not. The "remove the line endings" code you added removes the NL, then Serial.available() returns 0 so the while loop exits. On the next time through the loop function the CR is in the receive buffer, so Serial.parseInt() returns 0 (because that's what it does when it doesn't encounter any digits).

The solution is to add a short delay before the "remove the line endings" code to allow the CR to be received, as I demonstrated in #44 (comment).

myservo.write(input); // sets the servo position
Serial.print("Servo set to ");
Serial.print(input);
Serial.println(" degree");
delay (1000);
}
}