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c2po's blog
Archive for June, 2011
Posted by c2po | Jun 20, 2011 @ 02:41 PM | 6,772 Views
Although I already have Spectrum DX6i for playing with my Bind-N-Fly toys like Blade MSR I always wanted to control them with a normal radio with nice gimbals and decent programming, namely my newly aquired well used old trusty Futaba 9CHP.

Inspired by that thread I thought wat da heck, I have everything to do that: not needed E-Flite LP4DSM - check, Arduino Pro Mini - check, soldering station - check, donor for plastic case and 5 pin connector not needed Futaba module - check.
Well, as I never repeat the design as it is, always changing/modifying/rewriting/adding something, it was the same for this project. So I'll try to list all things that I changed.

For a transmitter I used a low power DSM2 TX module ripped off of my RTF Parkzone P-51 Mustang LP4DSM which I never used and probably never will.
Main processing is done by a Sparkfun Arduino Pro Mini 328 running at 3.3V/8MHz, it was chosen in order to save some power over the 5V/16MHz one. Processing power at 8MHz is more than enough to do the job.
As a voltage regulator I used LM1117 Low Dropout Voltage Regulator in SOT-223 package which I had laying around.
Instead of two LEDs I used two-color red/green LED which I also already had, saves some space and just looks cool.

Other components are nothing special, just regular 1/8 or 1/4-Watt resistors and one capacitor. You can vary the values quite deliberately, for instance LED current limiting resistors can be anywhere from 100 to 300-400 ohms, and instead of...Continue Reading
Posted by c2po | Jun 19, 2011 @ 09:14 PM | 5,915 Views
I discovered interesting similarity while working on some DSM2 related project: two Spektrum devices strikingly resembling each other, not just using the same chips but also a PCB layout is almost the same. One on the left is a cheap clone of AR6100e, and one on the right is the low power TX module from Spektrum MLP4DSM transmitter that comes with Blade MCX/MSR, Parkzone small planes, and other similar RTF stuff.
I just thought it was worth taking a macro shot. Enjoy.