Talk me out of using a Nexus 7 as a digital dash - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 10-29-2012, 10:20 PM   #21
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: Wake Forest, NC
Posts: 175
Total Cats: 0
Default

I feel as though this appropriately describes my feelings towards your post.

https://www.youtube.com/watch?v=YXON...tailpage#t=81s
cucamelsmd15 is offline   Reply With Quote
Old 10-29-2012, 10:42 PM   #22
Senior Member
 
Join Date: May 2011
Posts: 549
Total Cats: 56
Default

Quote:
Originally Posted by cucamelsmd15 View Post
I feel as though this appropriately describes my feelings towards your post.

https://www.youtube.com/watch?v=YXON...tailpage#t=81s
consider my mind just as blown on that link you posted to the android ms thread that ben started. I've been so consumed by the install and figuring out how to merge/sync the data... I hadn't even considered using it for ecu purposes.

So answer your original statement... "Talk me out of..." **** no, do it. Consider me game to exchange info/ideas when you do.
EErockMiata is offline   Reply With Quote
Old 10-29-2012, 11:42 PM   #23
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

Quote:
Originally Posted by 94mx5red View Post
Elaborate please.


Wife has the 7. Similar to an iPhone or iPad, screen shuts off when you tap the power button on the side of the unit. Also have to touch the button to turn the screen back on. You at least need to be able to reach it.

Not sure why you would power down completely.
None of that is an issue, it can all be controlled by software.
thenuge26 is offline   Reply With Quote
Old 10-30-2012, 01:06 AM   #24
Senior Member
iTrader: (3)
 
Join Date: Jul 2011
Location: STL
Posts: 528
Total Cats: 24
Default

Another option is to use the magnetometer. Probably less of an issue in a track car, but having a case fold open/closed would help hide it from would be jack-off ******* thieves and do double duty as a power button. This is gonna be awesome.
midpack is offline   Reply With Quote
Old 10-31-2012, 12:58 PM   #25
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,775
Total Cats: 1,106
Default

One of my coworkers has the nexus 7. Hopefully on Friday I will drive the track car into work and get some pictures of it in different spots and such on the dash.
shuiend is offline   Reply With Quote
Old 11-01-2012, 08:51 AM   #26
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: Wake Forest, NC
Posts: 175
Total Cats: 0
Default

Quote:
Originally Posted by shuiend View Post
One of my coworkers has the nexus 7. Hopefully on Friday I will drive the track car into work and get some pictures of it in different spots and such on the dash.
Yes, on the gauge cluster would be an excellent help.

I started the process of putting the DIYPNP in the car tonight, but that didnt go over so well.
Thread here:
DIYPNP no start on a 92 Miata - Miata Turbo Forum - It's the Cat's Meow
cucamelsmd15 is offline   Reply With Quote
Old 11-01-2012, 09:29 AM   #27
Elite Member
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

You guys are killing me.. We're really trying to figure out how to power a tablet in your car???

Attached Thumbnails
Talk me out of using a Nexus 7 as a digital dash-miniature-usb-car-charger.jpg  
elesjuan is offline   Reply With Quote
Old 11-01-2012, 09:36 AM   #28
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: Wake Forest, NC
Posts: 175
Total Cats: 0
Default

Quote:
Originally Posted by elesjuan View Post
You guys are killing me.. We're really trying to figure out how to power a tablet in your car???

Uh, I am. I don't exactly have a cigarette lighter or much of a dash anymore. Hell, most of the factory wiring is gone, and stuff like the radio, cool suit etc get their power from a distribution block that's wired right off the master kill switch.

So yes, I am thinking a little outside the box on how to power it.
cucamelsmd15 is offline   Reply With Quote
Old 11-01-2012, 09:41 AM   #29
Elite Member
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Quote:
Originally Posted by cucamelsmd15 View Post
Uh, I am. I don't exactly have a cigarette lighter or much of a dash anymore. Hell, most of the factory wiring is gone, and stuff like the radio, cool suit etc get their power from a distribution block that's wired right off the master kill switch.

So yes, I am thinking a little outside the box on how to power it.


Or take the USB Cigar adapter, disassemble it, place internals into a smaller case and rig up your own connection method. Your car has +12v in it somewhere.. Use it somehow to power the adapter.
Attached Thumbnails
Talk me out of using a Nexus 7 as a digital dash-22146276_dor_56482_pri_larg.jpg  
elesjuan is offline   Reply With Quote
Old 11-03-2012, 08:58 PM   #30
Elite Member
iTrader: (1)
 
cordycord's Avatar
 
Join Date: Dec 2011
Location: SoCal
Posts: 1,775
Total Cats: 148
Default Battery drain

You may have issues with charging. A standard USB charges at 500mA, which may not be enough if you're pulling multiple data plus GPS. 700mA would be better, as long as it turned off when the car was off.

While not as sexy, the b&w kindle nook and similar items are completely sunlight legible, and since they're Android-based they can be cracked.

okay, so maybe I've thought of this too...
cordycord is offline   Reply With Quote
Old 11-03-2012, 09:06 PM   #31
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: Wake Forest, NC
Posts: 175
Total Cats: 0
Default

Quote:
Originally Posted by cordycord View Post
You may have issues with charging. A standard USB charges at 500mA, which may not be enough if you're pulling multiple data plus GPS. 700mA would be better, as long as it turned off when the car was off.

While not as sexy, the b&w kindle nook and similar items are completely sunlight legible, and since they're Android-based they can be cracked.

okay, so maybe I've thought of this too...
Your points are valid, but here was what I determined:

Charging: Not as big of an issue, only has to run 30 minutes to cover a TT or race. Can charge outside the car after that.

Kindle/Nook: Probably disqualified, Im not sure they have the horsepower to run BOTH the Shadow Dash and the RaceChrono. Maybe if you were only using one or the other it would be feasible, I dont know.
cucamelsmd15 is offline   Reply With Quote
Old 11-03-2012, 11:09 PM   #32
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Really, for powering the unit, just use one of the above suggestions, or get a 5V voltage regulator and solder up an adapter harness wired into the ignition. Mount the regulator to something large and metallic that will sink the heat. It's not that hard. Stepping down DC voltage is cheap and easy.

5V Fixed-Voltage Regulator 7805 : Voltage Regulators | RadioShack.com

I think an Android tablet connected to a Bluetooth ODB-II adapters running torque and racechrono might work in the track car (LS1 with a GM ecu). Interesting idea.
ZX-Tex is offline   Reply With Quote
Old 11-04-2012, 05:22 AM   #33
Senior Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Sweden
Posts: 1,391
Total Cats: 58
Default

Quote:
Originally Posted by cordycord View Post
You may have issues with charging. A standard USB charges at 500mA, which may not be enough if you're pulling multiple data plus GPS. 700mA would be better, as long as it turned off when the car was off.
The Chinese lighter adapters are 2.1A or even higher now.
1A are all over the place (ordered 10 for $15 a couple of days ago).
NiklasFalk is offline   Reply With Quote
Old 11-04-2012, 12:43 PM   #34
Senior Member
iTrader: (3)
 
Join Date: Jul 2011
Location: STL
Posts: 528
Total Cats: 24
Default

You'll have to jumper the data pins on most chargers, otherwise the device thinks it's connected to a computer and will only pull 450mA. New-er Android devices measure the resistance across the two data pins to determine if it is connected to an AC charger or a computer to enable the appropriate charging mode. There are 4 pins, connect the middle two and you have an "AC" charger and the device will pull however many amps the charger provides.
midpack is offline   Reply With Quote
Old 11-04-2012, 01:00 PM   #35
Junior Member
 
Join Date: Jun 2011
Location: Houston
Posts: 409
Total Cats: 17
Default

I think its a great idea, but be aware that digital RPM gauges in general are harder to follow from the corner of your eye than analog gauges.

Back when I raced motorcycles I put a digital dash on my race bike and hated it. I couldn't read the tac without looking directly at it, which is not something you want to do.
Handy Man is offline   Reply With Quote
Old 11-04-2012, 01:10 PM   #36
Elite Member
iTrader: (1)
 
cordycord's Avatar
 
Join Date: Dec 2011
Location: SoCal
Posts: 1,775
Total Cats: 148
Default

Quote:
Originally Posted by NiklasFalk View Post
The Chinese lighter adapters are 2.1A or even higher now.
1A are all over the place (ordered 10 for $15 a couple of days ago).
I bought a reconditioned 7" Galaxy tablet for this very purpose; bluetooth, GPS, wifi, big screen, accelerometer, etceteras. I was talking with the guys at the Braille booth last weekend and they brought up the charging issue. Prior to that it hadn't crossed my mind that if the unit was plugged in to a USB it would still run out of juice.

I'm using a simple ELM327 bluetooth device ($30 on Ebay) that connects to the OBDII and sends data to the Galaxy. There are several applications, including "Torque", that give you a user-selected gauge panel array.

Edit--the higher-power chargers are a mixed blessing. If there is no circuitry to cause a float charge, your nice lithium ion battery could overheat and explode. Not good.

Last edited by cordycord; 11-04-2012 at 02:13 PM.
cordycord is offline   Reply With Quote
Old 11-04-2012, 03:22 PM   #37
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Quote:
Originally Posted by cordycord View Post
Edit--the higher-power chargers are a mixed blessing. If there is no circuitry to cause a float charge, your nice lithium ion battery could overheat and explode. Not good.
So I thought most or just about all of the modern devices that use li-ion batteries had the charge regulation intelligence built into the device itself (not the charger) and therefore the 5VDC charger feed could be a dumb 5V non-current regulated signal. Not true?
ZX-Tex is offline   Reply With Quote
Old 11-04-2012, 03:51 PM   #38
Elite Member
iTrader: (1)
 
cordycord's Avatar
 
Join Date: Dec 2011
Location: SoCal
Posts: 1,775
Total Cats: 148
Default

Quote:
Originally Posted by ZX-Tex View Post
So I thought most or just about all of the modern devices that use li-ion batteries had the charge regulation intelligence built into the device itself (not the charger) and therefore the 5VDC charger feed could be a dumb 5V non-current regulated signal. Not true?
Honestly dunno. I would hope so, but you know what they say about ASSuming...
cordycord is offline   Reply With Quote
Old 11-05-2012, 02:37 PM   #39
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Confirmed, no current regulation required. I talked to a buddy of mine that develops chargers for cell phones and what nots, including the N7. Just get a 5V regulator and wire it in. The battery charging controllers are in the device, not in the charger. Like midpack mentioned above you may need to jumper the connector to keep it from limiting current to 450mA.

For example, here is a 2A car charger for a N7.
Car Charger for Google Nexus 7

ASSuming cuts both ways. I would be pissed if a N7 needlessly died in the middle of a track session because I was not feeding it enough power.
ZX-Tex is offline   Reply With Quote
Old 11-06-2012, 09:41 AM   #40
I'm Miserable!
iTrader: (1)
 
Join Date: Jan 2008
Posts: 203
Total Cats: 8
Default

Mission Motors use a 7" Android tablet for their dash on their crazy quick electric motorcycle. When Jay Leno took it out, the dash turned off or something.
GAMO is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Momo Supercup seat jpreston Miata parts for sale/trade 2 05-17-2016 01:51 AM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
Run boost gauge from ECU MAP? Itty MSPNP 6 09-22-2015 12:02 PM
Which moderator should I talk to? unplugged92 Meet and Greet 4 09-16-2015 07:20 PM
Removing speedo sensor from gearbox ThunderFox Suspension, Brakes, Drivetrain 2 09-10-2015 04:19 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:19 PM.