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serial controlling a servo?

e14 Contributor

I got 2 servos in hopes of attaching them to my thermostats and having them turn the knobs but, i don't feel like changing the variables and re uploading the code to my arduino uno.  How would I be able to send a serial signal my computer and set that to a var on the arduino witch will turn the servo?

 

failed try:

 

#include <Servo.h>

 

 

Servo servo;

int servoSerial;

 

 

void setup(){

Serial.begin(9600);

servo.attach(9);

}

 

 

void loop(){

  servoSerial = Serial.read()

servo.writeMicroseconds (servoSerial);

}

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  • 0

    Hi Kyle

     

    Im afraid you need to walk before you can run...

     

    Try simply controlling the servo using the code first, then look at how serial.Read and Serial.Write actually do, there all about CHAR types and strings so you need to learn how to convert them to usable values using commands like ATOI(string) that converts a string to an Integer as an example

     

    You need to know what a char type actually is and what it looks like when received by the serial.Read command etc, to demonstrate this... Sending 127 from the keyboard of the PC to the Arduino does not yield the number 127 to be simply sent to the servo output, it arrives as 3 character values "1", "2" and "7", these would have to be converted to a number before you use them, in your code the way it is, sending a single character from the alphabet only and knowing its decimal value would or should work ut you need to know what is the right character for 1 through 127 or even 255 (Google Ascii Table)

     

    The Arduino sample sketches have all these examples built in for you to review and learn

     

    Once you understand them, it will be time to move onto combining different programs into ones you design

     

    Peter

Reply
  • 0

    Hi Kyle

     

    Im afraid you need to walk before you can run...

     

    Try simply controlling the servo using the code first, then look at how serial.Read and Serial.Write actually do, there all about CHAR types and strings so you need to learn how to convert them to usable values using commands like ATOI(string) that converts a string to an Integer as an example

     

    You need to know what a char type actually is and what it looks like when received by the serial.Read command etc, to demonstrate this... Sending 127 from the keyboard of the PC to the Arduino does not yield the number 127 to be simply sent to the servo output, it arrives as 3 character values "1", "2" and "7", these would have to be converted to a number before you use them, in your code the way it is, sending a single character from the alphabet only and knowing its decimal value would or should work ut you need to know what is the right character for 1 through 127 or even 255 (Google Ascii Table)

     

    The Arduino sample sketches have all these examples built in for you to review and learn

     

    Once you understand them, it will be time to move onto combining different programs into ones you design

     

    Peter

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