| |
Daniel:
>> I want to use rcx to control a lego train, but the fact that lejos only
>> have 7 levels makes it dificult to set the speed.
>
>
Mark Bellis wrote:
>
> I think at the very least you need to smooth the power output of the
RCX in
> order to turn PWM into steady voltage. I suggest a low pass filter
with a time
> constant (RC) longer than 166ms, followed by a power transistor drive
circuit,
> so that it uses a separate 9V power supply to drive the motor, not
the RCX's
> outputs.
hi Mark
i don't understand much about electronic. But can the lego electric
capacitor (part number 9916) be used for this purpose?
> So the conclusion of this essay is that the limitation is with the
RCX :-)
thank for the essay!
Daniel
|
|
Message has 1 Reply:
 | | Re: train control
|
| (...) The simple answer is "maybe"! If you have one handy, try it. I'm not sure whether the RCX will cope with a capacitive load rather than an inductive one, so I would advise you not to put the capacitor across the RCX output without a motor in (...) (20 years ago, 8-Jul-04, to lugnet.robotics.rcx.java)
|
Message is in Reply To:
| | Re: train control
|
| (...) There is a fundamental difference between the RCX and a Lego Train controller - the controller uses smooth power from a 3-pin regulator, with the voltage varied using a chain of resistors. The RCX uses PWM power with approximately 166ms square (...) (20 years ago, 3-Jul-04, to lugnet.robotics.rcx.java)
|
7 Messages in This Thread:
  
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
