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Full instrument panel with gadgeteer for a car?


#1

I have an idea for a car that i am building that that i am going to use an 7" display to show everything that the instrument panel usually does. for that to work the system have to handle a couple of sensors for like the water temp, oil temp, oil pressure, engine rpm, speed, fuel and so on.

The pressure, fuel and temp sensors are just normal variable resistance devices and the engine rpm and the speed are inductive proximity sensors.

It also has to sense the turn indicators, headlights and DRL and the easiest way would be to connect the output from their respective relays to the bord in some way?

my question is, should i go for a gadgeteer or are there other micro controller systems that would be better suited?

i have looked at some other options like:



http://www.ebay.com/itm/Micro2440-7-TFT-Touch-Screen-LCD-400MHz-S3C2440-256M-ARM9-Development-Board-/320855634201


#2

G120 based boards should be able to handle that. I would look at G120HDR module:

http://www.ghielectronics.com/catalog/product/431


#3

I’d start by looking at the connections to the current (or factory) instrument panel, and laying out what I had available to work with.


#4

Why not get the GHI CP7 display?

Maintenance wise, Gadgeteer couldbe attractive. Easy to replace components without soldering.


#5

godefroi: there is no connectors or anything. i’ve built the car from scratch so i choose the sensors myself.

do i need some kind of realy for the inductive sensors? the signal from them will probably be 12v wich i’m guessing is more than the card can handle?

what startup time do you think is possible to achieve? when the engine starts, it cant take more then 3 och 4 seconds for the display to show all info.

what more do i need except for the g120hdr card and a tft module and power module?


#6

Nice! Have some pictures to share? :slight_smile:

There is a relay module available. I would also get few of the breakout modules to connect external sensors through Gadgeteer sockets.

CP7 would be my choice too.


#7

old model of the body. it has been changed quite a bit since but (2 seater now and many minor design changes) :

anyway that relay module, which direction is the relays working? are the relays regulated from the external power source or are they regulated from the board?

does the G120 act as a motherboard or do i need one of those?

how do i connect the potentiometers and other units with variable ohms?

can i connect a potentiometer to adjust the brightness of the CP7?

oh and again with the boot time… if i cant get it under 10 seconds i might aswell scrap this project but hoping for under 4 seconds…


#8

From the picture of the relay module http://www.ghielectronics.com/catalog/product/391 I see three screws per relay. I would say each relay had NO and NC pins.
You would need an external power supply for the relays.

G120HDR is a standalone processor. It does not plug into a motherboard. You connect
your wires directly to it.

You would setup voltage dividers such that the voltage into the analog inputs are in the range 0-3.3V

Not sure about this.

You should be able to get going in under ten seconds. Four might be tight


#9

do anyone have the CP7 display and can say if it’s any good in sunlight?
or would it be possible to somehow hook up a


#10

I believe the resolution of this screen exceeds the 800x600 limit of the hardware.

There might also be an interface issue. TCON versus TFT? Hardware not my area.


#11

It has VGA input so it can be combined with http://www.ghielectronics.com/catalog/product/356
But then again, from a economic perspective i don’t think this is a good idea.

Maybe the old school approach with a deep assembly protecting it from sunlight is cheaper?


#12

yeah i am planning to do that as well but i have limited space, plus it cant be sitting to deep since it has to fit different drivers of different lengths and viewing angles.

i actually asked the wrong question. i came up with the idea about the Samsung screen after seeing that videoOut module but was wondering if the touch screen could be from the Samsung could be connected to the gadgeteer.

the touch screen is going to be used so that the driver can adjust the GUI and other things, so another reason it cant sit do deep.

Mike: both the screens seems to have the same native at 800x480.

but how will that work since the video out module supports either 640x480 or 800x600? stretched pixels? black bars?


#13

I’ve been evaluating different sunlight readable LCDs and have decided to go with this one: http://www.alpincorp.com/Transflective_LCD.html

The particular model I’ve chosen is 7 inches, 800x480, with combo VGA/RGB inputs and is transflective with an LED backlight. Models are available with resistive or projective capacitive touchscreens.

The CP7 is most definitely not readable in direct sunlight.