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Step 2: Wiring the Amplifier

The amplifier will be powered directly by the battery.  This will involve running heavy gauge wires from you car battery to the amplifier.  Read the instruction manual of the amplifier to determine the necessary wire gauge for powering the amplifier.  There are kits online that have pre-packaged wire for amplifiers or you can save yourself some money and go to the local hardware store and get them to cut a few feet of wire for you.
<p>Hi. I installed a similar CarPC with a 5 channel amp (4 speakers + sub), but I can't find any android apps that support surround sound. What app/software/DAC are you using to support your 4-channel amp?</p>
Every tablet on the market including apple and android devices only have 3.5 mm headphone jacks which only have stereo out L and R for aux cables and headphones it would be unreasonable to have surround out the 3.5 mm plug would be 3x as long but you can get surround sound out of Bluetooth if you have a 4 channel Bluetooth receiver you can get one for pretty cheap on Amazon or eBay or idk hope this helped but just so you know any 4 channel car amplifier ever has 4 separate channels but the head unit only really has 2 out so you have rear and front fading but that is the only difference between a head unit out via RCA and a tablet out via aux out if you want fading front to back get a RCA volume knob and put one on the front speaker side of the rca's and one on the rear side I don't think there is a single car on the market with true surround sound yes there is 4 speakers but the front and back play the same the front right plays something the rear right plays something and so on and so on so I don't know why you don't like android iOS does the samething and so does every thing else unless it is a PC with surround sound out.
Android 5.0 (Lollipop) and above have support for external DACs. The Linux kernal that Android is built on can support surround sound. Therefore, there's no reason why Android can't control surround sound; whether that's 4/5/6 independent channels, or just front/back and left/right fading. Why on earth would I want a separate fading knob in my car if I've already installed a tablet or PC?<br><br>My carPC runs Windows 7, because it can do all of these things. The car's original audio system from 2001 could do all of these things. So Android, it seems, isn't even a 21st Century operating system yet.
<p>He is just using 2 RCA splitters that he did not show in the diagram.</p>
That's a shame. It's this lack of basic functionality that prevents me from using Android.
<p>Hi</p><p>Great install thanks for sharing </p><p>Is there a way to connect the tablet to your phone over bluetooth for hands free?</p>
You have a noisy power supply. Search onlive for a power supply filter. It's easy to make and it really works.
<p>hi there if i connect it up to a pre amp for volume controls would it play just as loud as a standard head unit if im running competition sound? </p>
Very informative article!! You answered so many random questions I've had over the years, like why does charging cause static to appear in the audio? Or how can I stop charging a device once the car is off? Thank you so much for writing such an excellent guide.
<p>Only an opinion as to the cause of the interference while charging. Make sure you have a solid ground. If you have to, make an additional ground. Regarding the charging while the car is off, you can install a timed relay (similar to that used by your vehicle's automatic lights), or just tie into the timed light relay.</p>
Now if only there where an app that let you use an Android tablet as a speaker phone unit for a Bluetooth enabled cell phone.
<p>whar the exact pieces you need in order to have the tablet installed correctly? what is the name of amplifier, what specs does it need to have ? etc etc</p>
<p>Would be imaginable :)</p>
<p>Instead of adding a cigarette lighter style power jack, would it be possible to just wire in a USB jack? Since the original radio is going away, could a USB jack be powered from the vehicle harness adapter the same way the original radio was?</p>
<p>no usb is 5volts where almost all the electronics are 12v what I would do when I was an installer is solder a wire to the nipple of the cigarette lighter plug and one to the outer ground spring and then T tap those to switched 12v behind the dash that way you still have your cigarette lighter socket and your tablet wont drain the battery</p>
Wrong pal, you can use a 5v regulator off of the 12v ignition switched from the wiring loom. You could cut a micro usb cable and solder all of this in.
<p>Auto Zone sells the usb at you can hard wire into the car, it runs of 12v and outputs 5v at 2.1 amps. I have two of them in my truck right now</p>
<p>I have my tablet installed, but what have you done to keep it cool during the summer. Mine keeps getting hot and will not charge until it cools which typically isnt until night time. Any suggestions?</p>
<p>Oh wow what a cool idea, you can get a cheap 7&quot; table now for $40 on eBay.</p><p>★ Sign: 007 License Plate Hide Gadget: <a href="http://trydeal.com/inst" rel="nofollow">http://007Plate.com/inst</a> ★</p>
<p>Hi <a href="http://www.instructables.com/member/GabrielK2/" rel="nofollow">GabrielK2</a>,</p><p>I took apart a cigar lighter to USB adapter and mounted it into a spare switch blank (next to the rotary switch). Just need to replace the two connections and splice into the stereo feed. Works really well and I don't have lead hanging all the way down the centre console.</p>
This is a cool project, but readers ought to be aware that it is probably illegal in the UK, since it is not a dedicated satnav or music player.<br><br>You can get round it by wiring it in so that it cannot function whilst the engine is running.
<p>Or maybe running a on/off/standby switch to the handbrake? Handbrake pulled=tablet. Handbrake loosened=no tablet for you.</p>
Figures.
Great project - although there are plenty of bluetooth enabled after market systems available - which could make the audio linking aspect a bit easier. <br> <br>Saw this regarding legaility in the UK... <br>http://www.in-carpc.co.uk/legislation.htm <br>&quot; <br>Ensuring that the driver is not distracted <br> <br>Section 109 of the Road Traffic Construction and Use Regulations clearly states what information can legally be displayed on a screen that is within the driver&rsquo;s field of vision in a moving vehicle. All our fully installed systems apart from the Basic and Lite packages include the Centrafuse software interface, which provides a touchscreen friendly user interface. Centrafuse comprises many modules that perform different functions, examples of which are the navigation module, the hands-free phone module and the DVD player. When the vehicle starts moving, any modules that could cause distracting or illegal information to be displayed on the driver&rsquo;s screen are automatically disabled. Using the examples above, the DVD module would be disabled but the navigation and hands-free modules would not, as these are both legitimate uses of a driver-visible display. <br> <br>In addition, Centrafuse is automatically activated whenever the vehicle starts moving, so that it completely blocks the Windows desktop and any other running programs, and can only be minimised again when the vehicle is stationary. <br> <br>For fully installed systems that do not include Centrafuse we can use other means to ensure that the system remains completely legal. <br> <br>&quot; <br> <br>So it looks like centrafuse could be your friend here ... see http://www.centrafuse.com ... and they have a bunch of apps already available to look at car diagnostics etc <br> <br>This is the law <br>&quot; <br>109.&mdash;(1) No person shall drive, or cause or permit to be driven, a motor vehicle on a road, if the driver is in such a position as to be able to see, whether directly or by reflection, a television receiving apparatus or other cinematographic apparatus used to display anything other than information&mdash; <br> <br>(a) <br> about the state of the vehicle or its equipment; <br> <br>(b) <br> about the location of the vehicle and the road on which it is located; <br> <br>(c) <br> to assist the driver to see the road adjacent to the vehicle; or <br> <br>(d) <br> to assist the driver to reach his destination. <br> <br>(2) In this regulation &ldquo;television receiving apparatus&rdquo; means any cathode ray tube carried on a vehicle and on which there can be displayed an image derived from a television broadcast, a recording or a camera or computer. <br>&quot; <br> <br>Which means that you could not use it to change your music selection while driving ... but you can use it for a sat nav and to show images from a rear view camera
Nice write up. Working on my own because i came across this one. One question, how are you using the 4 channels out if the amp has 4 channel inputs? from the looks of it you have 2 channels going in(the 2 rca) to 4 channels out(4 speakers). I have installed amps before but am i missing something here, don't you need 4 channels in to get the 4 channels out? <br> <br>thanks in advance
<p>I'm pretty sure that a 3,5mm jack can transmit sorroundsound, which goes from the signal. L+R into 4 channels, front left, front right, rear left, rear right. Maybe that was the answer to your question?</p>
Hi Guys, I am very new to this forum and find all this discussion very interesting. I have a 7&quot; Android device which has outlived its usefullness to my children apparently and so I thought it might be fun to rig it up in the car for playing tunes and using as a gps and reversing camera. I noticed that JFarmer had quoted some regulations including the following &quot;(2)In this regulation &acirc;€œtelevision receiving apparatus&acirc;€ means any cathode ray tube carried on a vehicle and on which there can be displayed an image derived from a television broadcast, a recording or a camera or computer.&quot; Now correct me if I'm wrong but I am pretty certain none of the devices any of us have or are talking about has a &quot;cathode ray tube&quot;. Does this mean that the laws quoted by Mr JFarmer are nul and void perhaps? <br />Just a thought... many have gotten by on a technicality before. :)
<p>Adding to LunaEros' comment, in some cars, with in-car intertainment, fx a DVD player, you have to pull the handbrake, to &quot;prove&quot;, that you are standing still.</p>
<p>That is basically null and void.</p><p>What most laws state these days is that video entertainment cannot be in the view of the driver while the car is running.</p><p>Video for rear view and backing up is ok though.</p>
Where did you find the bracket for the tablet?
I started mine with a Samsung Galaxy tab 3 7&quot;. I'm doing a removable mount. And since everyone is having an issue with the whining noise, I found that using the Bluetooth function for the stereo, it doesn't create the noise. And I'll be using the ELM OBDII bluetooth adapter so I can monitor my vehicle using a split-screen app.
Could you use a otg plug and dac instead of the 3.5mm and power cable?
<p>How do you solve automatic powering ON/Off with ignition?</p><p>1st thing is setting the &quot;Stay awake while power is connected&quot; setting under developer options, and setting the screen timeout to a short value under display settings; if you connect the charging cable to a power source that goes on and off with the ignition, but what If the standby time of your tablet is not enough to handle your typical time with the ignition off? You may use an app like Tasker to set additional rules, like turning Wifi or cell connection off when the car's power is off. But how to solve complete On/Off ?- Something like hibernation like in Windows would be really cool - could be quite fast (tablet has a small ram) .</p>
<p>Hi there, i recently found a free app that as soon as you unplug the charger it automatically pause all media and navigation apps that drain the battery pf my android tablet. Its called AutoSleeper and this is the URL for Google Play.</p><p><a href="https://play.google.com/store/apps/details?id=com.as.powerchecker" rel="nofollow">https://play.google.com/store/apps/details?id=com....</a></p><p>Check out its features:</p><p>It is the best solution i've found.<ul><li> Your Tablet goes automatically to Stand By mode when you turn off the car engine- The Song you were listening to Pauses - When you turn on the engine the Tablet goes On again without pressing the Power Button:- Your GPS is on again- Your music continues exactly where you had left it- You decide if you want your Tablet to go to Stand By mode or to Off mode - You decide within how many seconds after you turn off your engine you want your Tablet to deactivate.- Autosleeper is designed for Tablets and Smartphones</ul></p><p>If you have any other suggestion let me know.</p>
Some apps for my tablet while I'm using in car and o few other advices related to what i've read : <br>http://gizpoint.com/how-to-tablet-as-car-pc-using-tablet-for-navigationmusicvideointernet-in-car/ <br>If you don't have a dock,you can go further and make a custom install in your dash. <br>
Can you show a link to where you got the Car Dock? I'm only finding them for the Galaxy Tab 2 7.7 (Verizon version). I need it for the regular Galaxy Tab 2 7.0. Great job btw.
This is good for people who have a lot of time and money on their hands. I did a very simple thing. <br>1. Get iPhone of android windscreen mount. <br> <br>2. Use a standard audio cable to transfer audio signals from phone to car. I used aux port but you could also use a special cassette tape that provides a 3.5 mm jack. <br> <br>3. Connect the phone's usb car charger to my 12 volt output. <br> <br>4. Download apps and enjoy!
Great idea but has one flaw. There is no android software. In my car I have carpc with software Centrafuse. Centrafuse have handsfree phone option when I make the call or recive the call the music mute <br>and when I use integrate navigation (Garmin) that when spoken instructions the music mute. It would be great if it would be possible in Android phones and tablets.
Great write up! I'm running into the same issue with a build of mine for an ipod cable which goes from dock 30 pin to USB for charging and 1/8&quot; for audio. The audio sounds great until I plug the power portion in and then, NOISE! I haven't been able to figure it out but suspect it's just poor quality shielding within the cable since it's getting clean power from a computer PSU. Did you ever figure yours out?
I would try adding a ground loop isolator into the circuit.
if you don't have enought room for dock connector you can make your own http://forum.xda-developers.com/showpost.php?p=20710266&amp;postcount=14 <br> <br>(samsung)
I never thought about using a tablet for a radio. I rather listen to my android tablet then listen to the radio because the radio plays garbage repeatably.&nbsp;&nbsp; Does it work wireless like some <a href="http://obd2bluetooth.org" rel="nofollow">obd II</a> systems.
Hey you should definitely make a series of videos on this this is amazing and i will be doing it in my car.../// i want to also integrate some engine stuff such as speed, rpms, if the tablet can read it i want to see if it can google maps integration as well just some ideas
The Tekzilla recently did a show segment on a cheap bluetooth obdii reader that can transmit to a tablet running Torque to give you those engine parameters. Here is the bluetooth module. I personally have never used it so I can't speak to how well it works but they seemed to like it. <br> <br>http://www.amazon.com/Soliport-Bluetooth-OBDII-Diagnostic-Scanner/dp/B004KL0I9I/ref=pd_sxp_grid_pt_0_0
Just out of curiosity, but since android is an &quot;open&quot; platform, are there in the market apps or hack that it could trully be converted to the central of the car, attaching it to different sensors to get temperatures, rpm and all other kind of stuff?
Yes you can, and it is a shame that the author did not delve into a vehicle data interface (OBD II). The android market has a host of apps that read in important vehicle data from an OBD-II interface. <br> <br>You see, all cars from 1996 and later have a standard port underneath the driver's dash that allows for auto shops to run diagnostics on cars and to even set some variables. One of these variables is the state of the &quot;engine light&quot;, which is how shops tun it off when their work is complete. Other information available ranges from fuel consumption to o2 sensor readings, practically all of the data that the car's computer has on hand, including those that you mentioned. Sadly, one of thee ones commonly missing is oil pressure. <br> <br>Anyways, this port can be connected to by an aftermarket reader that uses a decoding chip (one of the most popular is called &quot;ELM 327&quot;). This reader may be connected to your android, ios, or other device, granted that it has the software to read the incoming data. There are many bits of software out there for reading OBD data, my favorite is &quot;Torque&quot; on the android market. <br> <br>As for connectivity, you could use tethered or wireless. Wireless would be in the form of a wifi hotspot connection or a bluetooth connection. I curently use a wifi OBD-II adapter in my own car with the Torque application. This adapter only cost $25 on Amazon and seems to work perfectly for me (though there seem to be many cheap brand versions that do not work well). I believe that Android supports all communication formats, while iOS devices do not support the data transfer channels in a bluetooth connection. <br> <br>There's a lot of info that I have not put in here, but I hope this answers your questions. On a side note, my car did not come with an mpg calculator, but Torque works wonderfully at calculating instantaneous, average, and trip mpg.
And don't forget to install a fuse within the first 30cm of wire from the battery! This is very important to protect the wire and the car.

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