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1  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: October 23, 2012, 02:20:48 am
Although I have recently moved home and have no workshop or modelling facility (yet!) I'm still watching what is going on.
I see Flytron has announced their 1W modules...
http://www.flytron.com/openlrs/212-openlrs-m3-1w-tx-module-for-futaba.html

Would be useful to be able to fly with 100mW and hit a 'get out of jail button' for 1W.

Nigel.
2  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 20, 2012, 02:21:11 am
Great work and nice video.
Was that with UHF R/C ?

Nigel.
3  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 19, 2012, 05:06:37 pm
Thanks for the info Zitron.

Unfortunatley, I might have run out of time for now as I am on holiday the next week and when I get back I have to start packing our house up (and my workshop/hobby room) ready for a house move.
That also means I will be unlikely to do any R/C for several months as the 'new' place is a bit run down and needs quite a bit of work to be to my liking - great really as I can make it just what we need for the rest of our lives.  I am well into single digit numbers of years until my retirement, and it can't come soon enough!

I'll try to do some work as and when I can, but I really think my 'spare time' will be limited for quite some months ahead.

Nigel.
4  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 19, 2012, 02:32:57 am
Hi Zitron,

I understand the Futaba PPM signal on the module pin is open collector.
So, using your PCB, I added "digitalWrite(3, HIGH)" to the code and it now works -- sort of...!
The spec-an software shows a nice signal.

The servo I had attached to the Rx is jittering something awful and was crashing the gear against the end stop, so I stopped testing pretty quick.
I'm using your RF22 code from here:
http://arduino.cc/forum/index.php/topic,93777.msg767772.html#msg767772

On my ghetto 3v3 version, I loaded the same Tx code and the Rx gives a short flicker on the red LED as if it receives something then stops, also no signal appears on the spec-an software.
Will there need to be any code change to make a 3v3 Pro Mini work ?
I have this board, which has the addition pinouts
http://proto-pic.co.uk/arduino-pro-mini-328-3-3v-8mhz-new/

On your board, which way does the switch/jumper give low/high power?
Jumper across 3v3 and GPIO2 gives high power??

Sounds good reference your new PCB's.

We're getting there!!

Nigel.
5  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 18, 2012, 02:06:05 am
That doesn't work, pin 3 just needs pulling low to turn on the RF LED on the front panel of the Tx (a 1k resistor works fine).
For example, OpenLRS controls pin3 via Arduino and code.

I can use a 10k pullup resistor between pin1 (PPM) and pin2 (Tx battery voltage) and get around 10v PPM - waaay too much!

I think I'll try a pullup resistor between PPM and the 3.3v onboard regulator of my ghetto module.


Any other ideas? (other than using the trainer port, which is not an option for module useage).

Nigel.
6  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 17, 2012, 03:53:47 pm
OK, I built my ghetto Tx with an Arduino Pro Mini @ 3v3 and get no output from it.

Built one of Zitron's boards as a Tx and get no output from it.

Checking with one of Zitron's boards as an Rx and running the Spectrum Analyzer software, I see nothing from either of the above boards.
Using my OpenLRS module, I see a nice fat signal on the Spec An software.

My Tx is a Futaba T9C (FF9).
I scoped the PPM module pin and see nearly no signal output on my ghetto board or Zitron's board, but, with my OpenLRS module installed I see 2.3 volts on the 'scope.

So, how do we 'trick' the Futaba T9C into outputting a PPM voltage??

So near and yet so far!!

Nigel.
7  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 10, 2012, 04:13:26 pm
Hold fire on a new Tx PCB for a bit Zitron.
I'm building a test Tx rig to fit inside the module case.
I'm going to try it with an Arduino Pro Mini board at 3v3 & 8Mhz (wired 'dead bug' style) as the board will just fit across the Tx module case.
Should make the design simpler if it works out.
I'll post my findings here...

Nigel.
8  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 05, 2012, 04:33:45 pm
I have a 5v Pro Mini that I used on an early WiiCopter - still have a couple of Jussi's PCB's if you want one FOC?

I'm happy to split board costs with you for something that will fit both Futaba and JR.

Look at the case photo I posted a couple of posts back, it would be great if the board would fit and be able to connect the Tx pins into the board.
It will need a 5v reg as the Futaba Tx has battery supply voltage on one of the pins.
I can send you a spare Futaba case for testing.

Flytron makes a JR to Futaba adapter board for the Tx
http://www.flytron.com/123-futaba-jr-module-adapter.html

Perhaps we can continue this by PM and personal email exchange?

Nigel.
9  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 05, 2012, 03:33:05 pm
Wait are you sure you measured the Futaba modules?

I have a 9X which I think uses JR modules, but also measures 54x34??

Just re-checked and the absolute maximum space inside the Futaba module case is 34mm wide and 53mm length.
I can just get an Arduino Pro Mini board inside the case, positioned with the length of the Pro Mini across the case, so giving ~34mm of available space inside the case.
5v version
http://proto-pic.co.uk/arduino-pro-mini-328-5v-16mhz-new/
or
3v3 version
http://proto-pic.co.uk/arduino-pro-mini-328-3-3v-8mhz-new/

Maybe I'll hack a Pro Mini and RFM22B onto a bit of Vero board and see what happens...

Nigel.
10  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 04, 2012, 02:18:23 pm
Well, I went ahead and got a couple of the Futaba Tx module cases.

The internal dimensions are:
Width 34mm & length 54mm

Zitron, If you are willing to make a PCB that will fit the case, I can send you one of my spare cases as a pattern.
A Tx only board could then be made to fit a Futaba, a JR or just a 'hack module board' for 9X etc.
As I said before, I'm happy to assist with board costs.
An SMD mount Atmega would make the board size a doddle, albeit more difficult to solder (not a problem for me as I have an SMD hot air solder station) smiley-wink

This is the kind of thing I'd like...
http://blog.ckdevices.com/?p=119

What do you think Zitron?

Nigel.
11  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 02, 2012, 05:31:20 pm
Futaba Tx module:
http://www.hobbystores.co.uk/default.asp?itemid=Y-MA2214

A Tx only board would be great, but it would need to fit inside the module case to make it 'nice'.

I haven't built a Tx as yet, but will mash something together to try out on one of the boards I have from you.

I'll get you some dimensions from my Flytron board/module...

At a guess, the width will need to be around 33mm and the length is around 55mm.

EDIT

How about a Tx board that would fit inside the width of a Futaba case, and fit inside a JR module case as well (by making the length of the PCB fit the width of the JR case as they are wider than a Futaba case)?

JR case
http://www.jrradios.com/Products/Default.aspx?ProdID=JRPA615

Could be do-able by using coax for the antenna and short ribbon 'jumper' cable for Tx inputs?

Just a thought...

/EDIT

Nigel.
12  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: July 02, 2012, 03:39:52 pm
Hi Zitron,

I'll take one of your new boards as it'll just about shoehorn into the Futaba T9C module cavity.
PayPal OK?
I have enough components to build onto the board.
Real shame you couldn't get it to fit inside a Futaba Tx module case smiley-wink

Nigel.
13  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: May 21, 2012, 12:33:39 pm
Mine took less than 1 week from Germany to England - not bad for just a few Euro's postage.
You should be able to log in to your account and check your order status.

Nigel.
14  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: April 28, 2012, 01:46:48 pm
Hi Z,

I'm gathering together some bits as the data is apparantly sent over 433.92MHz AM radio by OOK (On-Off-Keying) and there is some info on the 'tinterweb about the protocols used.

I may just get another weather station with serial out on the receiving consol and do it that way.

I also have a Raspberry Pi on order (for ages now), maybe a low power web server and automatic weather station??!!

Too many projects and not enough time...!

Nigel.
15  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer using RFM22 module on: April 26, 2012, 05:09:05 am
Hi Z,

My first board works just fine as a spec analyser.
I've yet to build my other boards.

I'm a bit like you, no big motivation for UHF at the moment (I have OpenLRS for UHF R/C), plus I have a couple other projects - including weather monitoring, maybe with an RFM22B and an Arduino smiley-wink
With the British weather, you should get on it !

Nigel.
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