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Thread: Building an Android frontend

  1. #241
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    Quote Originally Posted by that_kid View Post
    I'm also using a directed HD tuner in my setup. I'm able to bring the audio from the HD radio into the system via my minidsp board. The audio from the tablet comes into the minidsp via optical cable but the unit also has 2 analog ins which I use to bring the HD radio in. Volume control is already done via the minidsp so the biggest hurdle for my setup is getting Autosense to send a control signal to the arduino when the radio is selected and switch the inputs on the minidsp from digital to analog. Actually I don't really need to switch it as the signals can be mixed, as I was sitting here typing this I thought about the fact that I'd still need the tablet audio for gps navigation. Then again I planned on using a bluetooth module to play the part of a headset connected to the tablet that way I can send that audio to the center channel speaker in my car.
    Yeah mine is basically the same, but I have the audio out from the tuner going to the Audio in of my USB DAC, and I then have the Monitor input switched to on, it then goes through 2 50K potentiometers (one for volume and one for balance) then to my amps. I wonder if it would be better to just merge the signals after the dac with a 'Y' cable and not use the monitor input.

    I do get a thump or crackle when the tuner is turned on or I exit out of the tuner app on the tablet. Once in a while I get a force close on the app as well. it might be because I have 2 different FTDI devices connected. I thought about the Mini DSP but felt the output gains to the amps was a bit low. After the volume and balance it goes through an old Phoenix Gold PLD-1 line driver then back to my amps


    Quote Originally Posted by that_kid View Post

    I got my new dc-dc module in the other day and I changed around how it connects to the tablet. Originally I omitted the circuit board from the battery along with the battery and went right to the positive and negative inputs. While this works without issue, the table had no idea what to put for the battery status. This left me with an exclamation mark in the battery symbol. So I included the circuit board from the battery which I then discovered is i2c and now my tablet reads 100% for the battery level. Now that I know the data from the battery board is i2c I want to find a way to read/imitate that data.

    Details on how you hacked up the battery to get to the Battery board? I am thinking I should do the same then at 100% it will know not to charge.. what was your final voltage at the battery connections on your supply?

  2. #242
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    You guys have links for the radio stuff you're using? If like to look into it deeper and see what I can do.

  3. #243
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    Radio.apk for the HD tuner found here..

    http://rootzwiki.com/topic/44698-04-jeep-tj-install/


    If the link is dead I can share it on my Google Drive

  4. #244
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    Sweet little device the hd tuner. It looks like it would be easy to incorporate the required functionality to control it directly from Autosense. I may have to get one at some point.
    I think of like to support a variety of different radio devices with a common UI. My thought is it would hook up to the Arduino. The Arduino being the middle man that knows how to talk to the radios.

  5. #245
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    that is what the other guy in that thread was doing.. through Arduino and bluetooth to Android.. eliminates the FTDI issue

    here is the command set for it:
    http://andy.dynamicbits.com/hdradio/

    http://www.mp3car.com/linux/114518-h...ml#post1200050

    Source code for some of it might be here:
    http://halblog.com/hdradiocontroller.html

  6. #246
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    Using the red board means I'm already using ftdi. That means I would have to do more checking when opening the device. Have a handshake built in. Something I should do anyways though. But it would make it easier overall.

  7. #247
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    Quote Originally Posted by eric_f View Post
    Using the red board means I'm already using ftdi. That means I would have to do more checking when opening the device. Have a handshake built in. Something I should do anyways though. But it would make it easier overall.
    Yes, but from what I have read.. the FTDI stuff he relies on s in the kernel. my ALDLDroid program has the FTDI drivers in the APK.

  8. #248
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    the way I'm doing it, the FTDI drivers would be included in the apk. From there, you wouldn't be required to plug in any devices directly to your Android.. The red board would be hooked up directly, and everything would be hooked up to it

  9. #249
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    I see., the redboard would be the connection manager..

  10. #250
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    Quote Originally Posted by that_kid View Post
    This is excellent news. I ran into a bit of a bump when evaluating using the redboard. I have some i2c things on the buss which are 3.3 volt tolerant but not 5 volt tolerant. I need to seed if there's a way to get it all working with a redboard which provides 5 volts to the i2c bus.
    Yes there is. I use the P82B96P for my Due to everything else. Works nicely.

    Quote Originally Posted by -=Jeff=- View Post
    I see., the redboard would be the connection manager..
    Basically. It directly connects to the Android tablet and everything would connect to it. That's how I'm doing it myself, and it works great.

    I'm using custom made hardware, which I have plans to sell later on, but it's basically an Uno clone, just like the redboard.

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