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Posted

Hi all,

I received this today so I want to share with all of you. You may downlaod the 15 page documentation from the link below:

[link removed - see the end of message]

I quote the message I received:

  Quote
The LEGO Group has released a new version of the LEGO Power Functions RC Receiver (identified by a short blink on the green LED when power is connected). The new version of the RC Receiver supports all functionality of the LPF RC protocol and we have added a command to access the extra address space. We are hereby offering you an updated version of the LPF RC protocol documentation. Please feel free to use any information from the protocol document for personal, non-commercial use only, provided you keep intact copyright, trademarks and other proprietary rights of the LEGO Group.

Gaute Munch

PS I uploaded it to our LUG server but our bandwidth is unfortunately limited. I would be very happy if someone could upload it somewhere else so I can remove it. Brickshelf didn't let me upload the pdf file for some reason?

Edit:

This has been published on Technic Bricks too, so here you go:

http://technicbricks.blogspot.com/2009/10/...col-and-rc.html

http://www.happybricks.com/TBs%20Media/TBs...20RC%20v110.pdf

Posted

It's all related to the single pin commands, but I have yet to see how those commands could be used with the currently available PF elements.

Posted
  Jetro said:
It's all related to the single pin commands, but I have yet to see how those commands could be used with the currently available PF elements.

You're right Jetro.

The main benefit is if you have 2 LEDs connected between each C1/C2 output and the +9V rail.

I did this in my IR Receiver Test Circuit.

In Brake mode, the IR receiver output has both C1 and C2 at 0V. That would turn on both LEDs.

Setting a speed (+ or -) would leave one LED fully on and would dim the other the faster the speed, to off at full speed.

The opposite direction would dim the other LED.

Use a 390 ohm resistor of 0.25W rating in series with each LED.

Alternatively the LEDs could be connected between C1/C2 and the 0V rail.

In brake mode, both would be off.

With a speed set, one LED would light up dimly, reaching full brightness at full speed, the other LED staying off.

With single pin commands, each LED may be turned on or off individually, without affecting the other.

We have yet to test whether both C1 and C2 may be at +9V at the same time. I think it will be possible if the motor driver IC has no restriction.

That would mean 2 LEDs connected from C1/C2 to 0V could both be on together, as well as both being off together. The same goes for 2 LEDs connected from C1/C2 to +9V.

Mark

Posted (edited)

Thank you for the explanation/experiment. Do you know if it would work with the existing LEGO LED lights?

Edited by Jetro
Posted
  Jetro said:
Thank you for the explanation/experiment. Do you know if it would work with the existing LEGO LED lights?

The LEDs in the existing brick are connected with a bridge rectifier, to turn on in either direction of C1/C2 speed.

They have an 18 ohm resistive connection to 0V but I think that's a bias, capacitor discharge mechanism (to protect the IR Receiver) or for detection of the device type rather than anything else. It might mean the LEDs could turn on in single output modes with C2 high and C1 floating, since the resistor shorts C1 to 0V.

Certainly the two LEDs operate together. I would really like a brick with one LED per C1/C2 polarity - it would make a great railway signal. I even drew the comparable circuit.

Mark

Posted

Well, this certainly opens the way for speculation on what this new functionality will be used for by LEGO and railway signals etc would certainly make a welcome addition to the range of available options.

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