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1  Using Arduino / General Electronics / Powering car radio and Arduino with batteries on: May 18, 2011, 12:35:16 pm
Hey there,

our party room is finally ready smiley
The "problem" now is that we need our gasoline generator for power supply (TV, radio, lights etc) and if we are bored and have nothing to do and go there by fun, we either take it with us or have no power there.
I asked myself whether it would be possible to power the car radio there and the lights using standard AA rechargable batteries. I have a bundle leftover from another project, i. e. 10 1,2V batteries wired together so I have a total of 25Ah on 12 Volts.
The car radio of course needs 12 Volts and has 2x40W speaker output which comes from a industrial power supply that converts normal 230V house power the generator provides. The Arduino and the LED light strips are on a separate power supply which also provides 12 Volts.
So, I thought I could use that battery package and connect it inbetween the power supply for the lights and arduino and ground. Same for the radio. Of course I then may NOT turn on the power supplies while the batteries are plugged in but this should work?

ATM it looks like this:
Power supply (+) --> Car radio (+) || Car radio (-) --> Power supply (-)
Power supply (+) --> LED strips (+) and Arduino VIN || LED strips (-) and Arduino GND -- > Power supply (-)

So I would then have it like this:
Power supply not plugged in but connected (+) --> Battery (+) --> Car radio (+) || Car radio (-) --> Battery (-) --> Power supply (-)
and for the arduino respectively.

Would this work?
And do you have any idea how long this will provide power? But I think 2 hours at least.

2  Using Arduino / Networking, Protocols, and Devices / Re: Ethernet only on Ethernet-SD-card-shield. Additional pins required? on: May 16, 2011, 05:18:01 pm
So, I cannot use the pins 50, 51, 52 and 10 when just using the Ethernet?
3  Using Arduino / Networking, Protocols, and Devices / Ethernet only on Ethernet-SD-card-shield. Additional pins required? on: May 13, 2011, 06:31:58 am
Hey guys,

I have already installed the Arduino Mega in our party room to control the lights and air conditioning and it works fine.
Now I have done another project (internet-enabled alarm clock) and since I don't need it anymore (unless someone here wants to by it for 100€ ? smiley-razz) I want to use the Ethernet shield to enable us to control the lights using our smartphones like I did when presenting my alarm clock. So I connect the Ethernet shield to an old WiFi router and this broadcasts the settings menu throughout the air to the smartphones.

My question is: Do I need any additional I/O pins for the Ethernet shield when NOT using (and of course not having one plugged in smiley-razz ) the SD card?
I read I need the Pins 4, 10, 11, 12 and 13 for the Ethernet shield thing but only when using the SD card? Since the wiring is already there and stuff I would just want to plug the ethernet shield on, upload the sketch, plug in the ethernet cable and all done.

4  Using Arduino / LEDs and Multiplexing / Re: LED faint light and gets darker the more you enable on: April 29, 2011, 06:46:33 pm
White LEDs drop more of a voltage than those of other colours, therefore they are much more sensitive to a low voltage.
So, do you think it will help if I connect another cable to them so more current can flow to them?
Tomorrow I will check the voltage of the power supply and the voltage of those LED strips, maybe it helps.
But I don't know why even enabling a single LED that is connected to a digital output of the arduino (status LED that something is turned on) can drain the power so that the LED bar (which is connected to an external power supply using a transistor) gets darker.
5  Using Arduino / LEDs and Multiplexing / Re: LED faint light and gets darker the more you enable on: April 29, 2011, 02:12:03 pm
But I can turn on any other LED bar without any drop in brightness (and those are identical ones, just blue and yellow instead of warmwhite and the yellow one is also 1m long (60leds) and those warm whites are just 50cm (30leds) and the rgb led is also on the same cable like the two warm whites and they work fine. It's really just those warm white LED bars. And also I don't understand why they still glow a bit even when the transistor is "shut off". The others dont.
6  Using Arduino / LEDs and Multiplexing / LED faint light and gets darker the more you enable on: April 28, 2011, 05:46:08 pm
Hey there.

For our party room outside in the forest I decided to build in Arduino controlled lights (LED strips).
I wired it all up and soldered it using MOSFET transistors connected to a 12V power supply.

So I have a blue LED bar, a white, a yellow, a warmwhite, a RGB and two warm whites.

The LEDs are connected like this: MOSFET's left pin (gate? dunno the names but well, I know which cable belongs wherre smiley-razz) is connected to the PWM digital output of the Arduino Mega. the middle comes from the minus pole of the LED and the last goes to GND of the power supply (and GND of the arduino because otherwise the transistors don‘t switch properly). So, the LED bar's minus pole is routed through the transistor while plus is constantly powered.
The problem now is: The fans we use for giving fresh air work just fine, so do the yellow bar, the white bar, the blue one and the RGB. So, you turn them off, they're off, you turn them on, they're on and fading and dimming using PWM works perfectly.
The two warm white LEDs now are my "problem childs": When I turn them off, they glow pale, when I turn them on, the more other LEDs and things I turn on, the more they get darker. The buttons on the control panel are also lighted, and even if they turn on (there are buttons that trigger nothing yet but glow up on pressing) the LED bar gets a bit darker. And those two are the most important ones (light for the room). The one in the other room (also a warm white LED bar) also glows when turned off but fortunately does not dim when other things are turned on.

I checked the wiring and programming and solderings but I cannot find the reason for them glowing when turned off and being dark. And if I did a bad job soldering and building it was hell of random that exactly the two identical models (and not for example any other LED bar) have the same exact problem.

7  Forum 2005-2010 (read only) / Deutsch / Arduino mit Fahrrad betreiben? on: June 03, 2010, 11:01:24 am

ich wollte mal fragen, ob man den Arduino auch mittels Dynamo antreiben kann?
So ein Dynamo liefert ja 4 Volt (oder so?). Das müsste doch reichen, um eben ein paar in Reihe geschaltete Akkus etwas zu laden und den Arduino dann eben mit 9 Volt über den VIN zu betreiben.

Aber die Dynamos liefern doch Wechselstrom?

8  Forum 2005-2010 (read only) / Troubleshooting / Re: Low power on Digital outputs on: December 05, 2010, 01:27:56 pm
Just because this board is too stupidly designed (seems Italians aren't just incapable of building cars, they also cannot build good micro circuitry either which may be the cause for FIAT cars being the worst cars ever built) that it cannot handle a 3,3V through an LED which has no affect to the board at all since it is still running I got the solution anyway.
Thanks for the help.
9  Forum 2005-2010 (read only) / Troubleshooting / Low power on Digital outputs on: December 05, 2010, 09:06:52 am

for a project I have several LEDs and a speaker and other things wired up.
Now today I wanted to continue working on that project and noticed that there is almost no power on the digital Outputs.
The LEDs connected (even with a test program that just digitalWrites them ON) only glim a bit but don't light bright. If I briefly connect the LED to the 3,3Volts output (I know it isn't healthy for them but for testing…) they shine bright. But I testet the pin 13, pin 4, pin 51, pin 53, etc of my Mega board and the LEDs are almost “off” and the speaker doesn't sound at all.

What happened here?!


Addition: It is not a loose GND or Power cable since if I connect an additional GND (holding a cable from GND to the LED) the LED does not light brighter and if I connect another Digital Output to the LED the LED just lights slightly brighter but still not fully. It worked on Wednesday.. Don't know what should have got broken since then
10  Forum 2005-2010 (read only) / Troubleshooting / Re: ks0108 display stays empty on: August 07, 2010, 11:55:59 pm
Guys you saved me from a lot of trouble smiley
Havin' fun with my LCD smiley

Thanks! If we'll ever met, I owe you a beer ;D
11  Forum 2005-2010 (read only) / Troubleshooting / Re: ks0108 display stays empty on: August 07, 2010, 10:23:54 pm
Okay, I am a huge idiot.
Hit me, please smiley-grin Now it seems to work. I accidently connected Data 8 pin with the RST port (which is not connected though).
But now it works. Ohhhhhhhhhhhhhhh smiley-grin
12  Forum 2005-2010 (read only) / Troubleshooting / Re: ks0108 display stays empty on: August 07, 2010, 07:53:27 pm
Of course I did. But then I could just set the "brightness" of the white. So either the display was blank, fully white or some sort of grey depending on how I set the potentiometer.

As I said, there has do be something broken, because otherwise the diagnosis would work and other library commands would work.
13  Forum 2005-2010 (read only) / Troubleshooting / Re: ks0108 display stays empty on: August 07, 2010, 10:44:33 am
That's what I see, yes.
But what are the correct setting.
I connected Vee to a 10kOhm potentiometer. And the other display (also blue white, 8x2 text) works just fine with that setting.
But either the display is white or blank or sort of grey, but I can't get it to display anything. And the diagnosis tools don't work either. At least the commands should work, don't they?
14  Forum 2005-2010 (read only) / Troubleshooting / Re: ks0108 display stays empty on: August 07, 2010, 09:41:30 am
Yes, I did connect one end of the potentiometer to the Vee, the other one to ground and the center pin to the wiper. Now the display is all white. But I can't get the display do display anything. And the library diagnosis is not working at all. So this is not contrast related. There must be something broken. By not displaying I mean I can't even get a successful writing attempt, all commands just fail, and if the contrast was connected improperly the display would just stay blank but the commands would be successful.
15  Forum 2005-2010 (read only) / Troubleshooting / Re: ks0108 display stays empty on: August 07, 2010, 07:16:18 am
Yes I bought it from on eBay.
My location is Germany.
I will check the bill, stay tuned.

Headers? You mean some kind of pins that I can just plug it into a board? Well I think male ones would be better. In your project you had female and now you're going to change them, right? So male would be better.

Ok, Bill date is July 14 2010 and the package arrived herre on July 21.
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