Need Xport device or info

[crashsiegel]

Folks,
Looking for a gizmo that plugs into a regular rx channel an operates an Xport module (like the bomb module).
Anyone know where I can get one or the info to make one?

Info like what each pin into the bomb module is - power, ground, switch (which is on/off=high/low or whatever), other wire.

Also, what about a device that looks at the channel pulse width and switches a FET or whatever when the width is >1.5mS or < 1.5mS or similar?

Links to any of this would be great too.

Thanks,
Crash

[Comatose]

http://www.dimensionengineering.com/PicoSwitch.htm is your second gizmo. There are plenty of places to get instructions to make something similar if you wanted to DIY it.

[crashsiegel]

Yes, I saw the Pico Switch.
Did I miss the pulse width switch points?
Closes at ?mS, Opens at ?mS.
Thanks
Crash

[crashsiegel]

Found this:
http://www.rc-cam.com/cammanxp.htm
It is an Xport to regular servo or camera shutter device.
Sort of opposite of what I wanted (a regular rx to XPort output device to control an Xport thing).
But it does have some info about the 4 pins on the xport connector.
Still looking...
Crash

[crashsiegel]

Found this itty-bitty regular rx controlled on/off switch gizmo:
http://www.rc-cam.com/bitsw.htm


Now I need to figure out how the bomb module operates.
It has an electro magnet which holds the bomb in place via an elastic cord/metal disc until the tx button is pressed. I need to verify if the magnet turns back on as soon as the button is released (I think so).
An electro magnet needs continous power until turned off.
So eithier the bomb module has an electronic circuit listening to the xport signal (pin 3, PRM signal - not PWM like our servos!) which turns the electro magnet on/off
OR
the bomb module is using the throttle kill (pin 2, assuming power out to the magnet until off time - THIS IS AN ASSUMPTION! But kind of makes sense - power the motor until kill... :confused:
I need to search and experiment more.

If the bomb module uses the throttle kill (pin 2) and gnd (pin 4) for magnet power then the bit switch or Pico Switch would work (Pico Switch would be easy!). :)

If the bob module uses the Xport signal (pin 3) and batt+ (pin 1) and gnd (pin 4) then it gets harder. I would need to convert a regular servo signal into an xport signal... :(
I have not found that yet.

Crash

[crashsiegel]

Power (Batt +V and gnd) where were I expected them - pin 1 & 4.

Ok, figured out the bomb releases (magnet power off) when the switch on the tx is pressed. Holding the switch keeps power off, releasing switch turns magnet back on.

It is not the throttle kill - it read 0V the entire time - switch pressed or not.

The xport signal pin changed voltage quite a bit when the switch was pressed. I don't have an o-scope but my DVM showed a low A/C signal (about 0.4V) that changed to a higher signal (about 0.9V) when the switch was pressed.

The module had an obviously intentionally buggered screw - obviously to keep dangerous people like me out. CA puts lots of things back together!
Anyway there is a 14 pin surface mount chip and some other parts controlling the magnet.

Crap! Now I need a regular rx signal (PWM) to Xport signal (PRM) conversion device if I want to operate an unmodified Xport device from a regular rx. Sort of the opposite of one the gizmo's above (Xport in, rgular servo out). Good luck on that one!

I am resisting a hack and wack session urge. As in get a spare module, figure out the magnet's drive requirement when on (volts, milliamps), then hack it for the small on/off switch regular rx device above.

I MUST resist - have a BOP on the work bench, son's rocket on the work bench (my 2 rockets are hanging fire!), Mach 2 in box resting against the bench for conversion to a pylon racer (my second, don't ask...).

Sigh!

Anyone have a Regular rx to Xport signal converter handy?
Thanks, Crash

[Comatose]

Yes, I saw the Pico Switch.
Did I miss the pulse width switch points?
Closes at ?mS, Opens at ?mS.
Thanks
Crash

The trip point is 1.5ms, plus or minus about .04ms of hysteresys