Newbie remote control question?

[aratti]

Clodoaldo, you cannot transfer the pulsin value to the duty cycle without some math manipulation.

Let's assume you want keep the velocity constant.

You measure the pulse width using the pulsin function (use a word variable)

You will have your motor running with duty cycle = 50%

Now the millisecs returned in the word variable is the speed of your motor and you have to decide which value rappresent the speed that you want to keep put this value into the variable Your_Speed.

Once you have done that, then the math could be as follow:

Read_Speed  Var Word
Your_Speed  Var Word
Deviation      Var Word
Duty            var Byte
Error_Flag       Var Bit

Duty = 50

Your_Speed = ?????

Calculation:

Deviation = Read_Speed * 100 / Your_speed

Error_Flag = 0

If Deviation > 100 then Duty=Duty-(Deviation-100)

If Deviation <100 the Duty = Duty +(100-Deviation)

If Duty > 100 the Error_Flag = 1

Return

Check Error_Flag before passing the new duty value to the PWM comand.
A Pause value, to give the motor the time to gain the new speed is recommended.


Al.

[aratti]

Let's assume you want to controll the velocity and you have no feedback from the motor.

You will give the word variable Max_Speed an arbitrary value that you will never exceed (this will reppresent duty = 100%).

You measure the pulse width using the pulsin function (using a word variable)

Once you have done that, then the math could be as follow:

Read_Speed  Var Word ' value that you will send via RC
Max_Speed  Var Word  ' arbitrary value = to 100 Duty cycle
Duty            var Byte
Error_Flag       Var Bit



Max_Speed = ????? ' you enter here your arbitrary value

Calculation:

Error_Flag = 0

Duty = (Read_Speed * 100 / Max_speed) 

IF Duty > 100 Then Duty = 100 : Error_Flag = 1

Return

If Error_Flag = 1 then you have sent a value greater than the permissible one.

You can add a line saying that if Read_Speed is minor then X duty = 0

(If Read_Speed < xxx then Duty = 0) in case Read_Speed could never be zero.

Remember that HPWM duty cycle 100% = 255.

Al.

[Ioannis]

If you loose your RF signal, what should your motor do?

Please note that frequency in HPWM is a word sized variable, so it must in Pulsin also.

Ioannis

[Clodoaldo]

See the speed control does NOT return automatically. It is a simple equipment so if I fail to reset the speed the engine should not stop...

Now I did NOT know that the variable for (HPWM) is (WORD) ... I try to use the examples of ARATTI and change the code to new test...

For now thanks for the support. Once back with results.