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Thread: Building an Android frontend

  1. #221
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    that_kid
    that's very cool. I would love to have the functionality you need built in, we'll have to figure it out.

    -=Jeff=-
    Phone calling is a tricky thing i have yet to work out. It's easy enough to initiate the call, but the Bluetooth stack doesn't support audio for calls. I am leaning towards an external device to handle the audio while the tablet shows you the data.

  2. #222
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    Quote Originally Posted by -=Jeff=- View Post
    WOW.. Very COOL!!!

    One question how do you use your tablet to make a call? I want that functionality although App Radio will give me that..
    Thanks -=Jeff=-,
    I have Tablet Talk installed on the tablet and my phone. Basically tablet talk just tells the phone to dial and hangup and such but it doesn't handle audio. I've been looking into outboard bluetooth modules for that. I found a nice one what had noise cancelling built in along with some other functions.


    eric_f

    That would be great to have it built into the app, i'm sure we can figure it out.

  3. #223
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    -=Jeff=-

    The tablet barely fit in my dash too. I had to make some smart tweaks to get it in there mostly because i wanted buttons and knobs. The bezel started out like this.

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    Then I found a radio on ebay which had buttons that I could fit in there(barely fit at that)

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    so I got the radio and had at it with mr dremel . I really wanted to use the four buttons but there was no way I could get them to fit.

  4. #224
    Newbie gregthomas129's Avatar
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    Quote Originally Posted by that_kid View Post
    Ahh ok I see what you're saying. That's the way I have my Due setup now. I use the native port on the due to provide usb multimedia functions and serial for data to the tablet. I'm in the beginning stages of the serial control part as I had to focus on the hardware aspects of the install first. I thought of using the Due because of all the connections it had not to mention the two canbus ports that are built in but after using a microchip i2c 16 bit i/o expander I don't think I will need as many dedicated connections on the Due itself. My bezel has six buttons and two rotary encoders with buttons and I am able to get my wire count from the bezel to the arduino down to 6 wires as opposed to the 16 wires I would need straight to the arduino.


    -=Jeff=-

    I created a bezel that has six backlit buttons and two backlit rotary encoders with buttons. All the connections from those components along with the 3 hardware buttons from the tablet connect to a microchip MCP23017 16 bit i/o expander which allows me to access all 16 ports via a 2 wires on the i2c bus to the Arduino. I actually use two addition connections from the expander to the Arduino which carry interrupt requests to the Arduino. The encoder on the left controls the volume of my minidsp 4X10 interface which is connected to my amplifiers. I can control the volume either from the bezel or the steering wheel buttons over Canbus. The actual volume on the minidsp is controlled via an i2c digital potentiometer which also connects to the Arduino. The button on the left encoder also can be used to toggle the tablet on/off and i'll eventually add long press options to it as well. The right encoder will be used to scroll through items on the tablet and the button will be used to select items. The idea is that I'll be able to operate the tablet as a regular head unit and not have to look at what I'm doing on the tablet yet still have things happen. The six buttons which will be painted black once my stencils come in will be used to control the tablet as well. I plan on assigning the buttons to commonly used items such as Home, Nav,Phone, etc. Because everything connects to the Arduino I can extend the button functionality with long presses too.Attachment 72029
    Nice work man! I've wanted to do something similar in my car, except I want to put the buttons in a spot which is occupied by a blank plug which fills holes where buttons would be if my car had those options. I will probably have to order the factory buttons and figure out a way to change the stenciled letters.

    Anyone here use a backup camera with their setup?


  5. #225
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    Not yet but considering it.. My tablet is in my 1990 corvette so not sure I need the camera
    Last edited by -=Jeff=-; 08-25-2014 at 08:33 AM.

  6. #226
    Newbie gregthomas129's Avatar
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    Quote Originally Posted by -=Jeff=- View Post
    Not yet but considering it.. My tablet is in your 1990 corvette so not sure I need the camera
    I've got an easycap and a camera on the way. Not sure how well its gonna work though.


  7. #227
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    I'm still working out the backup camera situation. I'm thinking easycap may be what I do unless I come across something else.

  8. #228
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    USB cameras and Android are a hit and miss game. It's another thing I've looked into that I plan on supporting eventually. With the Arduino based hardware it should be simple enough to detect reverse and have the camera popup on the screen automatically. It's a matter of finding a suitable camera and writing drivers. One more of those things "on the list" lol. I with I had 5 of me for this project

  9. #229
    Newbie gregthomas129's Avatar
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    Quote Originally Posted by eric_f View Post
    USB cameras and Android are a hit and miss game. It's another thing I've looked into that I plan on supporting eventually. With the Arduino based hardware it should be simple enough to detect reverse and have the camera popup on the screen automatically. It's a matter of finding a suitable camera and writing drivers. One more of those things "on the list" lol. I with I had 5 of me for this project
    There's actually an app floating around called carcam which will open when a video signal becomes present. I plan to use the reverse lights to power up the camera which will pop up carcam. That's the plan anyway.


  10. #230
    Newbie gregthomas129's Avatar
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    Hey I can post immediately now. That was annoying.

    eric_f likes this.

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