Problem about External Library Import Arduino in Embed

Phan Truong
Phan Truong Altair Community Member
edited June 2021 in Community Q&A

Hello community,

I'm programing a basic robot arm, and in my embed file i used 2 external library is AccelStepper and Servo. My file is attached in this post.

My problem is:

1. When i set 1 for Enable Excecution compound Manual, i can control 2 stepper motor with button but only few second.

2. I was setup angle for 2 servo using myservo[0].write($1) and myservo[1].write($2) and 2 servo no responden after i upload code. I tested run single servo with example file in Example -> Embedded -> Arduino -> External Library Import -> Servo-Mega and have the same problem.

3. In compound Auto, i get angle for motor with compound GetEmlementMatrix. But when i upload code seem like all motor don't responden.

Ps: When i test Auto or Manual mode,  i set Enbale Excecution for compound to 1.

 
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Answers

  • Sreejith_21826
    Sreejith_21826 New Altair Community Member
    edited June 2021

    Hi Phan,

    1. Try to Enable compound block as background Thread

         Compoundblock->(righclick)Local Timestep ->codegen as background Thread

    2. Servo motor can be controlled with PWM signal also.

        a. Open attached diagram : ControllingSevowithPWMsig->Ex7_Servo_motor_control_triangular.vsm

    3. Servo control using External library 

        a. Open attached diagram: ServoUsingExternalLibrary->Servo-Uno_0_180.vsm

            You can enter the value and verify the servo position. If the servo is already in that angle, try with another value between 1 - 180

        b. Open attached diagram : ServoUsingExternalLibrary->Servo-Uno_0_180_backGroundThread.vsm

            It will be same as above, but the main task run in background thread instead of Timer.

    Please verify 2 and 3, using single servo motor and let me know the status.

  • pdarnell
    pdarnell
    Altair Employee
    edited June 2021

    Hi Phan,

    My colleague Sreejith has replied, but for some reason it is not showing. Here is his advice:

    1. Try to Enable compound block as background Thread and compile it
    2. Verify the servo motor using attached diagram
    3. Control the servo in 9th pin using direct PWM signal (ControllingSevowithPWMsig->Ex7_Servo_motor_control_triangular.vsm)
    4. Using External library and set a constant position. On the next cycle try with another value between 0-180

         ServoUsingExternalLibrary->Servo-Uno_0_180.vsm

        ServoUsingExternalLibrary->Servo-Uno_0_180_backGroundThread.vsm

  • Phan Truong
    Phan Truong Altair Community Member
    edited June 2021
    Peter Darnell said:

    Hi Phan,

    My colleague Sreejith has replied, but for some reason it is not showing. Here is his advice:

    1. Try to Enable compound block as background Thread and compile it
    2. Verify the servo motor using attached diagram
    3. Control the servo in 9th pin using direct PWM signal (ControllingSevowithPWMsig->Ex7_Servo_motor_control_triangular.vsm)
    4. Using External library and set a constant position. On the next cycle try with another value between 0-180

         ServoUsingExternalLibrary->Servo-Uno_0_180.vsm

        ServoUsingExternalLibrary->Servo-Uno_0_180_backGroundThread.vsm

    Thank you for your prompt reply.

     

    I tried with 2 servo control file that you attach. It doesn't work for me. Servo still work with arduino code but i don't know why it doesn't work with External Library.

     

    If i want control using PWM, how can i control angle with pulse? 

    Thank you!

     
    image

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