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Thread: Building an Android frontend

  1. #211
    FLAC SNOtwistR's Avatar
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    -=jeff=- you might want to check out what I have for sale might fit your bill perfectly http://www.mp3car.com/classifieds/15...o-uno-kit.html will take 125 +shipping SNO

  2. #212
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    Wow, what SNO is offering is a damn good price. I'd buy it, but I've got most of that stuff already, and don't feel the need to buy more at the moment.

  3. #213
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    I got a message from Greg. The ROM he was talking about is here

  4. #214
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    thanks for the link

  5. #215
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    -=Jeff=-

    So I removed the battery from my Nexus 2013 and used the connector from the battery but replaced the battery itself with a 3.7 volt regulator I got from ebay similar to this one. Everything works fine but I've replaced the 3.7 volt regulator with a 3.8 volt regulator which is what the battery voltage is supposed to be. For that I am using something similar to this board. For whatever reason the Nexus doesn't show 100% capacity, I think it's having a issue calculating the correct capacity. I'm going to play around with a couple things on the regulator end to see if i can get it to read correctly.


    eric_f

    So you're saying that I can use the uno as an accessory and still use usb host mode from the Nexus? I need usb host mode to connect to my DAC and SSD drive. Other than that everything else can be done over AOA. If that is the case then I need to order a couple uno's. I am running a i/0 expander which takes rotary encoder and button inputs from the bezel I made for the Nexus. I also use the i/o expander to interface with the hardware buttons on the Nexus.
    Last edited by that_kid; 08-23-2014 at 10:32 AM.

  6. #216
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    Ihave one of those DC Regulators, but it goes to 5v.. I could use that with a Resistor as a voltage divider to get my 3.8 ( I think it is 3.85v) for the tablet.

    I am surprised yours registers a % for the battery, I have a N7 2012 and I heard by doing that on the 2012 it shows battery as 0% since there is no data communications to the battery now. I also heard that messes with the clock too.. but I have not done it myself so I cannot confirm

  7. #217
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    Quote Originally Posted by that_kid View Post
    Other than that everything else can be done over AOA. If that is the case then I need to order a couple uno's. I am running a i/0 expander which takes rotary encoder and button inputs from the bezel I made for the Nexus. I also use the i/o expander to interface with the hardware buttons on the Nexus.
    What is AOA?

    the bezel sound pretty cool. Care to share what you have done? meaning more details. I still need to decide if I am going to leave the tablet in or swap back to the app radio

  8. #218
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    Quote Originally Posted by that_kid View Post
    eric_f

    So you're saying that I can use the uno as an accessory and still use usb host mode from the Nexus? I need usb host mode to connect to my DAC and SSD drive. Other than that everything else can be done over AOA. If that is the case then I need to order a couple uno's. I am running a i/0 expander which takes rotary encoder and button inputs from the bezel I made for the Nexus. I also use the i/o expander to interface with the hardware buttons on the Nexus.
    Your statement is mostly correct. I know you need USB host mode for your accessories. I am (re) adding the functionality to use an Arduino while using host mode. But, it does not use AOA, the tablet acts as the host, and uses plain serial. It requires me to provide my own protocol to function. But yes, it WILL work with your setup. (OTG cable plugged into tablet and SSD and DAC plugged into USB hub).

    As for what to order, I would recommend the Sparkfun Red Board. It is an UNO clone that uses a FTDI chip that I know works. I have one and it's what I use for testing. I don't have an official UNO, and because it doesn't use FTDI I can't be sure it works. If somebody wants to donate an official UNO I can make sure. Until then, get a Red Board.

    Quote Originally Posted by -=Jeff=- View Post
    What is AOA?
    AOA is Android Open Accessory protocol. It's what I'm using to communicate to the Arduino DUE with the Android tablet. It's Google's official way of using an Arduino with Android. But like everything, it has it's limitations, that's why I'm adding options.

  9. #219
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    Quote Originally Posted by eric_f View Post
    Your statement is mostly correct. I know you need USB host mode for your accessories. I am (re) adding the functionality to use an Arduino while using host mode. But, it does not use AOA, the tablet acts as the host, and uses plain serial. It requires me to provide my own protocol to function. But yes, it WILL work with your setup. (OTG cable plugged into tablet and SSD and DAC plugged into USB hub).

    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.Name:  20140823_133535.jpg
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  10. #220
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    WOW.. Very COOL!!!

    I had to cut my bezel to make my tablet fit (barely) I am leanign towards going back to the App Radio and still have some of the functionality

    I need to try the USB DAC with the android stick, The ROM on there has controls to determine the Audio input to the stick, if it detects the USB DAC, then I need to figure otu how to pass the audio in to the output for my HDTuner

    but, Impressive job on bezel and such

    One question how do you use your tablet to make a call? I want that functionality although App Radio will give me that..

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