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31  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: April 13, 2012, 03:29:45 am

One step at a time, let me get this simple board working properly first!

You are right! It will take me a lot of time till I'm at the stage to start building olrs....since I intend to first try and play with a diy 2.4ghz booster based on rf2126 chip...

In the meantime I'd like to ask you, which vreg could be a suitable replacement for the one Melih uses - mic5205...I read the datasheet and saw it has a really low dropout voltage or something like that..Is there any other which has a low dropout voltage but a higher maximum current?

So you use LM1117?

Regarding Melihs design besides powering the atmega and rfm22, does anything else use power (maybe the driving of the servos? and if so do they use such a small amount)? Because that mic5205 has a small max current..
Thanks!
32  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: April 12, 2012, 04:37:06 pm

Yeah except I really don't know much about RF design... If I tried to make one of those high power amps it would probably catch fire!

No need to worry about that since at would be runing it at 1/7 of its total output power and in such conditions you dont even need a heatsink for the chip..
33  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: April 12, 2012, 02:25:13 am
Looks great Zitron, a piece of art!

Using those cheap chinese nano clones, i think i can get bellow the price of one Melih's receiver and I also save for a ftdi, since they have an onboard ftdi (I would remove the nano from the headers when uploading)..

I'd be interested in buying a booster pcb from you (same layout as Melih for the same chip), maybe if you could design it in a way that the resistors, caps, diodes,  etc would be of a bigger size, for easier diy work...Do you manufacture these pcbs by yourself?
34  Community / Exhibition / Gallery / Re: Another breadboard-friendly 'duino (or how I learned to love the dork - again) on: April 12, 2012, 02:11:18 am
Are you willing also to share the Eagle files?
35  Community / Exhibition / Gallery / Re: Loguino - Logging platform for Arduino 1.0 Release on: April 11, 2012, 02:24:59 pm
Interesting, would this work for logging data from a FGPMMOPA6B GPS module? Would you help me with the neccessary code?
36  Community / Exhibition / Gallery / Re: Another breadboard-friendly 'duino (or how I learned to love the dork - again) on: April 11, 2012, 02:16:12 pm
Sorry for the noobish question, but when connecting the ftdi and uploading the sketch, does this duino self-reset?
37  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: April 11, 2012, 02:14:47 pm
Zitron sorry for the late response.. You can send/sell the pcbs that you reserved for me to other guys...
I'll probably make my own diy single layer boards and use an arduino nano..I'll make the connections per flytrons schematic so that I won't need to tinker too much with the code..I'll make the nano removable so that I could remove it from the board when uploading new sketches (since 5V would kill the rfm22b)..

I would take yours if there would be a possibility to easily port openlrs code...but its a bit too complicated for me..
Hope you continue with your nice project and post code...Hope then when you write your code for lrs you'll still have some pcbs to sell smiley-grin.
38  Using Arduino / Project Guidance / Re: Need guidance for building OpenLRS on breadboard and next on pcb on: March 21, 2012, 11:37:46 am
Can two arduinos communicate through i2c if one is running at 5V and the other at 3.3V?
39  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: March 21, 2012, 10:31:52 am
Devonian are you willing to modify the interesting features of openlrs firmware (failsafe, rssi etc.) to work on this nice hardware?

Edit: Zitron hope you received my pm with my address. Zitron hope you retain the same connections on your board so more code fluent friends on this forum can help me out with the code smiley-grin
40  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: March 19, 2012, 03:30:47 am
It looks nice zitron!
41  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: March 16, 2012, 12:16:51 pm
Hi.. What about failsafe? Do you have it already implemented, could it be implemented that one would preconfigure the arduino sketch to a certain level of rssi, and it would go in to failsafe then...

Did you make your own antennas for your LRS? Are you planning to make a LOS test? People get about 4km with openlrs on omnidirectional antennas..

42  Using Arduino / Project Guidance / Re: Need guidance for building OpenLRS on breadboard and next on pcb on: March 15, 2012, 10:02:28 am
Yep I have, it has to run on 3.3V.

Edit: I have found I guy who remade the layout of the boards so that the atmega runs at 5V...I'm in touch with him now..
43  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: March 15, 2012, 09:59:50 am
Thanks for the schematics! I would be interested smiley in a few (3 or 4), I don't care about size, for me bigger is better since its easier to solder slightly bigger stuff..Very nice!

Would you also share the code? Is your code also frequency hopping? Do you have failsafe implemented? Do you have rssi implemented (would it be possible to have an audible alarm, if I connected a buzzer to the board), can rssi be taken from the board (on the plane or heli) to an osd? Is it possible to configure the power output of the module - for example to use a booster.

Are you familiar with multiwii (http://code.google.com/p/multiwii/ , http://www.multiwii.com/ )? Probably it would be possible to incorporate multiwii in your design, because the relevant pins (SDA and SCL) for interfacing with sensors are free right?
I would like to have my plane stabilized and autolevel,...Since your board is 5V unlike Melihs, I can use a original wii-motion+ as a gyro,...and as a accellerometer I will use a adxl345 which has already an LLC and voltage reg. on board.

Instead of using a SMA connector like on your photo, could I just solder the coax directly to the pins? (central conductor+shielding)

Are those two leds on the board useful for diagnostic if the boards are working, for example uploading blink sketch?

How far away did you go with your heli smiley-grin?
44  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: March 14, 2012, 02:39:10 am
Very nice lookin' boards really  smiley-cool.... So you have some LLC to convert the 5V to 3.3V or so to not damage the rfm22b? I see the pcb is soldering friendly smiley-grin..
Did you have to modify the code in anyway to make it work on your boards, are is the board layout, per schematic and per code - just that it runs on 5V?
Are you willing to contact me by mail with some more details?

Do you sell the pcbs?

Another question about Melih's boards,...Does he have to use a 3.3V ftdi basic breakout to upload code or can he use 5V? I'm asking this because I don't know if current is flowing through the circuit while uploading a sketch, in that case 5V would damage the rfm22b.

A online friend of mine also build a spectrum analyser using openlrs...you guys are smart....I would  need one for 5.8ghz but he said it would be  hard to source parts for 5.8ghz... smiley-cry
45  Using Arduino / Project Guidance / Need guidance for building OpenLRS on breadboard and next on pcb on: March 13, 2012, 09:15:05 am
Here are some links for this opensource project if you don't know it yet: http://code.google.com/p/openlrs/
Here is the schematic: http://www.flytron.com/pdf/OpenLRS_RX2.pdf

So here are few question: Do i see correctly is he running the atmega328 on 3.3V and 16MHz? What is the purpose of that 3.3V voltage regulator that is on the board?

I would like to use atmega328 dip from ebay, which has uno bootloader already installed...It should work right?
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