KD7LRI
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I have been thinking to do this since about June of last year but never got around to it. I am so glad to find someone working on a project like this! You have done some great stuff! I am looking for a solution for more short range communication (ish). Allow me to explain…
The idea I had was to enable users outside of cell service etc to use a battery powered BT module connected to their radios to communicate with their phones allowing position updates of all other users, text messages between them and PTT functionality (use the phone as a handset). All of this would use a combination of packet, normal simplex and, for longer ranges, PSK31. I have not had the time unfortunatley to undertake the deveolpment of such a system…
The obvious problem right now is the audio interface between the radio and the phone. Your schematic is great and will probably work perfectly for alot of different systems. However it still requires the phone be physicaly connected to the radio. I have been able to find almost nothing about an easy to build, or cheap to buy interface that can be used for input and output of audio through BT on android. I dont have the time to go the arduino route (also a bit more expensive to go that route that would be nice). Just wondering if anyone knows of such an adapter, I would be more than willing to help with development, funding of a phone to BT to radio interface.
Those are my thoughts atleast, all of it is doable with time I know. I just wish I had more of that…
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Wolphi
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Bluetooth would be really nice. I though about it before and did some research on the internet. I found a lot of adapters to transfer audio simplex from the phone trough bluetooth to a bluetooth receiver but not duplex.
All the bluetooth headsets and hand free kits work duplex so there must be some chips available that we could use. I did a search on Digikey and found a couple of chips which support audio and even UART’s but they all come in like 96pin SMT packages and they have to be controlled by a MCU.
If someone finds a bluetooth duplex module I also would be very interested in it.
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VE3SUN
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How about the Atmel AT76C551. It seems to have what you need in one (huge) package.
Maybe they have a development kit with it on a little board?
Otherwise, the combination of a cheap BT dongle with the Microchip USB host stack could be of use. That pairs nicely with Android phones for serial data and you could decode the PSK31 in the PIC24F.
PIC24F kit
Here is a sample implementation with source code available that I have used with good success:
Odroid BaB
Peter
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This reply was modified 594 days ago by VE3SUN.
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Wolphi
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Hi Peter.. Thanks for your great info. I checked the links and I think the AT76C551 is a chip we could use. The 176pin SMT package is kind of scary  but maybe there is a developing board avaialble. It has a ADC/DAC and a UART. I think this chip would be perfect.
I also looked at the Odroid BaB. The board including the bluetooth dongle cost only $45 but I don’t see ADC pins on the board. So it would be difficult to sample the audio input from the radio.
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ke5cos
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Bluetooth connectivity to an amateur radio xcvr would be outstanding. I ordered a no longer manufactured Cardo Systems BTA II Bluetooth Adapter off of ebay in the hopes of making something workable between the HTC Inspire 4g and IC-706mkIIg to run the DroidPsk program. Anyone have any ideas, I’m all ears.
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ve8ne
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If you have a regular old Bluetooth earpiece paired to the Android device, can you hear DroidPSK’s audio output in the earpiece, and does your voice into the earpiece’s microphone show on the waterfall display?
I would test this myself but I don’t actually have an Android device yet, DroidPSK & DroidRTTY are the ‘killer app’ that’s made me want one. I’m looking at the cheap tablets made overseas, but they don’t have microphone jacks, only built-in pinhole mics and 3-conductor output-only headphone jacks. But some do have Bluetooth…
Bluetooth earpieces are reasonably cheap and it’s easy enough to crack them open and solder up alternate audio connections (like this). A connection from the earpiece’s speaker and microphone solder pads to an interface similar to the FT817 interface already demonstrated would be easy.
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oh2ww
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Regarding bluetooth, it would probably need to be a stereo device, so that the general device audio input/output is supported. The cheaper headsets usually only work with the phone application. Also, there are special bluetooth headset adapters designed to work with any set of headphones, which are probably easier to hack. e.g. this one by Sony.
I myself just ordered this Android 2.2 netbook specifically to use with DroidPSK and DroidRTTY, which has both audio and mic jacks as well as USB support that is compatible with a USB soundcard dongle/interface (I sent email to the importer). It also will fit perfectly in my go-bag with my FT-857D. Something to consider over other options.
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yo2ldk
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hi all,
i take this nice BPSK app, to play with my Xperia device and TXCVR in mobile or at field day
work well on xperia arc s but, i cannot connect to my bluetooth (homemade) interface, based to Motorola stereo device.
i connect my phone, but signal on waterfall is taken from mobile microphone, not from bluetooth output! ( remember, my phone is connected with bluetooth device)
same interface work very well with my old HTC HD in windows mobile!
if i receive an incomming call, that is routed to bluetooth device, so, i think is a software bug ?
one more thing to do is when we receive qso , can you made some modifications , in that way when push to correspondent call that will be copy to LOG? is a more easy way .
hope this will be solved soon, with next upgrade
my best 73 !
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Wolphi
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Bluetooth doesn’t seem to work on the transmitting path. At this time I don’t have a Bluetooth headset here to test it but I just ordered a Bluetooth module last week and as soon as it arrives here I will make the necessary changes in DroidRTTY and DroidPSK. I will take me probably 1-2 weeks till I have an update ready. Please stay tuned….
vy73
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oh2ww
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I for one eagerly look forward to hearing how it goes adding bluetooth support. The Android Netbook I ordered wasn’t fast enough to reliably decode incoming signals, so I sent it back. It was otherwise a very nice little device. So I’m back with no proper microphone input. Hacking a bluetooth headset, or similar, looks like the next best (or even arguably better) solution.
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Wolphi
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To bad the netbook didn’t work. It looked really nice. I did a little reading in the last couple of days about implementing bluetooth and I am pretty sure that I get it to work. The biggest question I have right now is if I can use the regular bluetooth mode or do I need the A2DP mode. The module I ordered suppose to support A2DP. I will probably have more information by the weekend.
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This reply was modified 493 days ago by Wolphi.
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Wolphi
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I got the bluetooth module today. It is as big as my fingernail and has 58 pins. I will see in the next couple of days if I can get it to work. I will post the results here if there are any
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ok1djo
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Hi Wolphi, did you consider to take a look at the AndPskMail? (http://pskmail.org/AndPskmail.html) They allready did implement the BlueTooth support and I confirm that it works, they use plain BT handset, soldered to connectors to trx. As the AndPskMail does use PSK as the PskDroid does, the use of such concept is possible.
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Wolphi
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Hi OK1DJO. I just tried AndPSKMail. Unfortunately I am getting a “force close” on my phone as soon as I enable Bluettooth in AndPSKMail preferences.
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Wolphi
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I got Bluetooth working in DroidPSK now. The sound looks clean on the oscilloscope but I have about 20% white noise in the background. The other problem I am facing right now is that my bluetooth module is missing some packets from the stream and I can hear a cracking sound. As further I hold the module away from the phone as worse the cracking gets. I bought a cheap hands free kit yesterday and compared it to my homebrew Bluettooth module and I get the same effect. I tried another phone as well. On my Galaxy Nexus the cracking noise is really bad on my Droid Incredible it sounds better but still not clean. I tried the A2DP mode yesterday and I had no cracking noise and white noise but the signal didn’t look good on the scope. I have pictures at http://www.wolphi.com/droidpsk/images.
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