Good night oppo

"CCC (formerly CyclistCarCoexist)" (ccpbb) 12/06/2015 at 02:26 • Filed to: The matrix chronicles

0

9

Aaaaaannd let the Matrix Shield Tablet Dash Project commence! Any electronic experts Opponauts here that know how to hardwired a tablet without a battery with USB?

traitor joe > CCC (formerly CyclistCarCoexist) 12/06/2015 at 03:25

0

What exactly do you mean by hardwiring?

ToyDeathbot > CCC (formerly CyclistCarCoexist) 12/06/2015 at 07:46

0

The Shield uses a microUSB, so the easiest way to go about it is to buy a microUSB cable and modify it to connect it to +5V VCC (needs roughly 1-2A) and ground. You can follow the pinouts here:

You can then remove the battery and iirc, to power it on you need to hold down the power button and one of the volume buttons. The Shield’s battery is not intended to be removable and the battery pinouts are not available (from my 5min google). If you have the guts, you can get a multimeter and probe the battery (One should be 5V, one might be 3.3V, a few may be TX and RX if your battery has a chip, and one should be ground). Otherwise, just hack the micro-B.

JGrabowMSt > CCC (formerly CyclistCarCoexist) 12/06/2015 at 08:20

0

Does it not have a battery, or is it dead?

As has been pointed out, wire to the USB only. You can get adapters and voltage regulators for it. You need to make sure you give it a least the same power as the wall charger to ensure it can operate. Not enough power is dangerous for the memory of the device, it could become corrupt easily.

I will say this though, enough hard shutdown events could cause problems for you. I would aim to keep the battery, but thats up to you. Even car computer kits are wired and have a backup battery thats just enough to ensure a proper shutdown.

CCC (formerly CyclistCarCoexist) > JGrabowMSt 12/06/2015 at 13:31

0

It has no battery whatsoever. I’m still trying to source a bstteryn that will either fit in a space resembling a single DIN space or hardwire it to the power adapter I have on board

CCC (formerly CyclistCarCoexist) > JGrabowMSt 12/06/2015 at 13:40

0

FYI this is what is going on

CCC (formerly CyclistCarCoexist) > traitor joe 12/06/2015 at 22:52

0

Connecting it to USB

traitor joe > CCC (formerly CyclistCarCoexist) 12/07/2015 at 02:32

0

USB runs at 5v and your car runs at 12v, so you will need a voltage regulator. You can hook it up to your accessory wire which turns on with the car. Should be easy enough to tell what’s what when you take the tablet apart.

CCC (formerly CyclistCarCoexist) > traitor joe 12/07/2015 at 04:08

0

I do have an inverter built in with a 2 prong, but the problem I'm struggling with is how to wire it up to USB limiting to 3.7 volts...

traitor joe > CCC (formerly CyclistCarCoexist) 12/07/2015 at 05:27

0

Sorry, I only just looked at your sketches/plan. Pull out your radio and find a wiring diagram for it. One of the wires will be 12v all the time, even when the car is off, and one will be 12v only when the car is on. Pick which you want (I would use the former), splice into it and purchase an adjustable DC volt regulator. You can get a decent, tiny one for under 10 bucks on ebay. This way you will be able to hook it straight to the cut battery wires and if you use the constant 12v wire, your tablet will never lose power (at risk of draining your battery, but tablets use very little power).

In order to install a single DIN unit, you will likely have to purchase a mounting kit which should be pretty cheap. Now all you have to do is mount the tablet. I looked and most of the matrix single DIN mounting units have a little shelf underneath the radio. IMO the easiest mounting method would be to use something that fits snugly into that little opening, and then you can put brackets on that. Even a piece of wood would work fine. This way you would not have to hack up the mounting kit and it would be easy to remove if needed.