Newbie remote control question?

[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.