interfacing prop to RC receiver

smbaker

Any tips on interfacing to a Radio Control receiver, like say for example this one:

http://www.towerhobbies.com/products/towj0224_n.html

My guess would be that it can be interfaced similarly to the GWS PG-03 Gyro in the Propeller Official Guide book, but I figured it's worth a double-check to see if there are any existing applications or objects. I'm assuming these RC receivers all run off 5V, not I'm not quite sure how we're able to get away without a level shifter between the prop and the 5V device (I haven't done any mixing of 3.3V and 5V devices until now, so I don't know the rules).

Thanks,
Scott

Mike Green

There's a whole long thread on interfacing 5V logic with 3.3V logic like the Propeller. Look at the "sticky thread" called "Propeller: Getting Started and Key Thread Index". You'll see a topic called "Technical Considerations:" and under that is a link to what you need.

The details of how you do the software depends on the specifics of the R/C receiver. Typically you'd get 5V/0V pulses with the pulse width ranging from 1ms to 2ms or maybe as much as 0.5ms to 2.5ms. This object may help you: obex.parallax.com/objects/522/.

CannibalRobotics

Read my article in April SERVO. The whole solution is there.

http://servomagazine.com/index.php/magazine/article/trade_two_pwm_channels_for_a_whole_bunch_of_switches

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Post Edited (CannibalRobotics) : 5/2/2010 1:17:36 PM GMT

Sapieha

Hi CannibalRobotics.

Nice article - BUT.
For many of us unusable SCH files as them can only be read by them that have same Software You support.
For ones that me that use different PCB software More usable are PDF type SCH files.

Regards

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Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.


Sapieha

hover1

I converted the schematics to PDF's

Jim

W9GFO

smbaker said...
Any tips on interfacing to a Radio Control receiver, like say for example this one:

There are several objects in the Obex for reading RC signals. One of them is mine.

All you need to do is put a 1K or 4K7 ohm resistor (I use a 1K) in series with the signal line.

Rich H

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The Simple Servo Tester, a kit from Gadget Gangster.

CannibalRobotics

@Hover, thanks for the conversion. As in the past,·I had originally submitted all of that information to SERVO in .pdf format - this time they·requested the native formats - go figure.

@Sapieha, the applications to read those files, should you choose to do so, is available for free download at the ExpressPCB website: http://expresspcb.com/·It's a decent program, easy to use·and there are allot of forum members that use it.

Glad·my article project is·getting used - let me know how it goes!

Jim-



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Signature space for rent!
Send $1 to CannibalRobotics.com.

Sapieha

Hi CannibalRobotics.

I have already to much Programs installed.
If I not like one - I un-install it - And that Program are EXPRESPCB

Regards

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.


Sapieha