Comment by Brian Donovan on March 19, 2012 at 11:46pm

Hi Earl

I flashed the unit and it looks great. Appreciate the post.

A few questions if you would be so kind.

1. No problem on the TX and RX

2. Where is the best place to pull VCC and GND for XBee . Off the pins on the Mega 21/22 or 52/53 (same potential?) or elsewhere?

3. Assume it is only the 4 pins required from XBee being Vcc, GND, RX, TX

Thanks

Brian

Comment by Earl on March 20, 2012 at 9:58am

My er9x runs on 7.2vdc so I have a new 3.3v regulator on the 7v line. This is to ensure the XBee has the power it needs on transmit and that the er9x doesnt brown out. My 900mhz XBee is a 60mw out unit. If XBee used on rx only, you could run it on 3.3v inside er9x, I would not do that tho. A new regulator is so easy so I recommend doing it that way.
Earl

Comment by Earl on March 20, 2012 at 10:26am

You see my er9x is loaded ! Has a Spectrum TX module to fly my Blade Mqx quad.

You can see the 3.3vdc regulator and Xbee.

I have a Walkera TX module the same size as the Spectrum module I am going to add also.

With all the antennas poking out, my Er9x is beginning to look like a porcupine !

Earl

Comment by Earl on March 20, 2012 at 10:28am

I forgot to point out the LCD backlight mod and the Smartieparts programmer board !

Earl

Developer Comment by Pete Hollands on March 20, 2012 at 1:03pm

The arduino serial library seems to have had a specific baud rate generator issue at 57600.
Fixed in latest arduino ide.

Comment by Earl on March 20, 2012 at 6:43pm

@Pete

The compile for the ardupilot program ? and 38k works ok

earl

Developer Comment by Mark Colwell on March 21, 2012 at 5:50am

Earl, great post!

Glad you embraced Mavlink protocol, original AP Serial text stream was so wasteful.

I am exploring using a CRIUS USBasp V0.2 to program TGy-9  vs SmartieParts. I have installed Fr-Sky-Tm module, just received the Hub and triaxial Acc sensors, Ordered several other sensors RPM, Fuel level and Variometer. All works well, I will add tx modules for DX-7, & Walkera. All in the same RC tx. DC power mods are almost required to power up all this stuff!

Comment by Earl on March 22, 2012 at 5:35pm

I just found how to set the arduplane or arducopter or arduquad to a different baud rate for telemetry using the mission planner.

This is great because the APM2 board now runs at 38kb on telemetry for my modded er9x tx.

Mike showed me how to go to the prams section in mission and change serial3_BAUD param from 57 to 38. No kb or anything, just replace 57 with 38 and write prams !

Someday we will find out whats wrong with the 57kb rate.

Earl

Comment by Zachary Eldridge on May 11, 2012 at 11:50am

Anything else new about this we need more pics?

Comment by John Wiseman on May 11, 2012 at 12:17pm

When will we have the first open source radio system, with open schematics & firmware?  Let's bring this side of the industry into the 21st century.

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