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1  Using Arduino / Project Guidance / Storage of information in arduino on: April 06, 2013, 12:44:25 am
Im working with a computer for my car.
It have a 3,2" TFT screen wich shows speed, gps coordinates, wvo control, and info about when next service is etc.
I want to have the ability to store the km-info about service in a way that I can change the info without uploading new scetch.
Im thinking maybe SC-card, but that require a SD-card reader for my arduino. Maybe I can use EEprom an easy way?
And I want to control settings with ONE button only.
When setting wvo, I use only one button in a way that U can click it, or hold it for 2sec to use two different functions.

Anyone can help me how to do this most easily?

Using a Arduino Mega
2  Using Arduino / Project Guidance / Re: GPS unit on: November 19, 2012, 12:42:34 pm
Thanks..
But I figured it out;)
3  Using Arduino / Project Guidance / Re: GPS unit on: November 19, 2012, 11:15:37 am
still working on this.. feel kinda noob, and well I guess I still am:P

anyway, have tried to calculate this in arduino but dont know what variables to use etc..

Is this simple to make for anyone wanting to help me?
4  Using Arduino / Installation & Troubleshooting / Upload to arduino on: October 25, 2012, 04:07:59 pm
Hi.
Have read about uploading to arduino projects with rx, tx pin?
How do I do that?
I want to do this with my arduino chips on breadboard..
5  Using Arduino / Project Guidance / Re: GPS unit on: October 09, 2012, 08:27:35 am
thank you;)
6  Using Arduino / Project Guidance / Re: GPS unit on: October 09, 2012, 07:59:42 am
how do I do that i arduino?
7  Using Arduino / Project Guidance / Re: GPS unit on: October 09, 2012, 12:57:07 am
I got the gps unit working with an arduino mega;)
But it gives me coordinates like this: 5936.681N, 547.789E

Easy way to get 59.611344,5.796477 ?
8  Using Arduino / Storage / Re: Arduino Mega 2560 - troubles with LC Studio card reader on: October 07, 2012, 04:06:48 pm
I also have problems with this.
Everythings seems to work fine, Cardinfo is showing....

But Im not able to write to a file..
Would apreciate if anyone knew whats causing this problem....
9  Using Arduino / General Electronics / Nec 2501 photocoupler on: September 17, 2012, 01:54:50 pm
Need some help here. I have never worked with photocouplers before, so this is totally new for me.

Ive connected a nec 2501 to control an input to arduino from my car. it should read a car switch (12-15v) on/off.

Connected like this:
Car 12 -> anode
cathode -> 1k resistor -> GND

Arduino 3.3v -> Collector
Emitter -> arduino pin 2
Emitter -> 10k resistor ->GND


The voltage from the car varies from 12V to approx. 14,7V
When its 12V i measure about 1.something volt on the emitter
When car voltage to anode is 14.7Volt, I got 3.4volt on my emitter.

WHY?
Whats the point of a photocoupler if the voltage varies like this?

Or is it badly connected?
10  Using Arduino / Project Guidance / Re: GPS unit on: September 15, 2012, 11:54:31 am
thank you;)
that one is perfect!
11  Using Arduino / Project Guidance / GPS unit on: September 15, 2012, 07:19:21 am
Im working on a simple computer for my mitsubishi pajero gen1
I want to have speed monitoring on a lcd screen.
I know there is a pulsesignal from the speedo, but dont know if its possible to use this with my arduino, or how to do it.

So I was thinking to put a GPS module to it to get speed. Then I also can get lat/long and altitude.

Any tips of a cheep and easy to use gps module?
Best if it has external antenna, as my dashboard is metal and arduino is placed under it.
thanks!
12  Using Arduino / Programming Questions / Re: Help saving some values on: September 14, 2012, 06:15:23 pm
Got it working smiley-grin

Also, the reason I couldnt store 9 was that I had it like 09
13  Using Arduino / Programming Questions / Re: Help saving some values on: September 14, 2012, 05:30:30 pm
I get an error everytime I try to save 09 in my EEPROM.. dont know why.. maybe the chip is corrupt..

anyway, if I cut it in pieces, like two numbers in each eeprom address like this:

EEPROM.write(0, 1);
EEPROM.write(1, 00);
EEPROM.write(2, 00);

how do I put them together again when reading so I get "10000"?
14  Using Arduino / Programming Questions / Re: Help saving some values on: September 14, 2012, 05:17:28 pm
or maybe I can store them in progmem... hmmm
15  Using Arduino / Programming Questions / Re: Help saving some values on: September 14, 2012, 05:06:27 pm
cut them up then?
cause I cant store them there as they are now..
and also, I cant store a value like 09 in EEPROM
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