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166  Using Arduino / Sensors / Re: Motion Sensor Problem on: July 06, 2012, 05:29:13 am
i didnt have one yet, but from my understanding that motion detector is rather a heatsensor then an actual motionsensor. If the 2 heatsensors inside measure a different value u get a signal.
Did you consider that?
Do you get a Motion detected while letting it face a cold wall and wait for like a minute?

found this:
"I had the same issue with this Sparkfun PIR. I resolved it by wiring past the voltage regulator and running it off of the Arduino 3.3v"
and why do you use 12v when u can use arduino power?
167  Using Arduino / Sensors / Re: Motion Sensor Problem on: July 06, 2012, 05:07:47 am
it seems to work also with 5V

check this out:

http://bildr.org/2011/06/pir_arduino/
168  Using Arduino / Sensors / Re: Motion Sensor Problem on: July 06, 2012, 05:01:34 am
Hi what kind of signal do you expect?
And what signals do you get?

google translate tells me this:
"If movement is detected inside the room, the pin labeled "alarm" goes to logic low."

why do you think it would output 12V?

In the schematic its attached to 5V not 12V on the signal line, so it should either output 5V or 0V.
IMHO the sensor doesnt output anything, it just switches to gnd

Open collector:
An open collector is a common type of output found on many integrated circuits (IC). Instead of outputting a signal of a specific voltage or current, the output signal is applied to the base of an internal NPN transistor whose collector is externalized (open) on a pin of the IC. The emitter of the transistor is connected internally to the ground pin

Do u actually source the sensor with 7V-12V?
169  Using Arduino / Sensors / Re: Arduino Current Sensing on: July 06, 2012, 02:49:30 am
sorry off topic, but which circuit programm has that schematic of an arduino?
170  Using Arduino / Storage / Re: Is there a SD Tutorial? on: July 05, 2012, 05:03:07 pm
i altered a schematic.

It shows how this sd module started to work perfectly for me.

I hope this can help someone else in future, that is facing the same issue.
Please notify me if i made a mistake.
171  Using Arduino / General Electronics / Re: Relayshield Question on: July 04, 2012, 11:58:15 am
thank you, so i was right to ask first instead of just trieng it :-)

Whats this:
"5V 8-Channel Relay interface board, and each one needs 15-20mA Driver Current" about?

As i know opto LEDs need something like 1-5mA to work properly, and also that mini green LED, but not 15-20mA? Or did they mean a relay would need 20mA instead of 80mA?


I have another question:

i have a powersource that can switch between 12;9;7,5; and 6V.
and these specs:
Power: DC 9W
Current: DC 500mA

so i guess those 500mA wont be enough if i need 600mA+
But is 500mA really the limit? As using 7,5V would be 9W/7,5V = 1,2A and not 500mA, or is it meant in a different way?
172  Using Arduino / General Electronics / Relayshield Question on: July 04, 2012, 11:19:35 am
Hi,

im a bit too scared to just try. Since some things r still not 100% obvious to me. I hope u can put some light in the dark.

I bought a relay shield like this:
http://www.ebay.de/itm/5V-8-Relay-Optical-isolation-module-shield-for-Arduino-Electronic-DIY-/250896859735?pt=LH_DefaultDomain_0&hash=item3a6a9e4257


It says:
5V 8-Channel Relay interface board, and each one needs 15-20mA Driver Current

But that doesnt account for the max 40mA per pin and 200mA all pins rule, as the Inputs only deal with the small current amounts of that opto led, right?

So whats the limit for the amount of relays and current? 300mA USB can give to the arduino? Or if i power the ardui via powerjack with 9V max 500mA, would be 500mA the limit or even more, like 1A of a 7805?
edit: or should my question be, how much current can the powerregulator of the ardui handle? cant find something in the "hardware section"

and is this true: if i use powerjack with 12V i get 12V at the VINpin of the ardu, which i could use to power up something else like a 12V relay?

Thx in advance.
173  Using Arduino / Storage / Re: Is there a SD Tutorial? on: July 04, 2012, 05:10:32 am
using 1k and 2,2k for SCK 3,44V divider and its working like a charm :-)

btw how freaking awesome r fat16libs expample progs :-)


using 5V or 3,3V dividers except for SCK line: Quickstart: everyting is great
Eventlog ( guess cause its trying to write to SD ): error, error and garbage files
174  Using Arduino / Storage / Re: Is there a SD Tutorial? on: July 04, 2012, 04:30:56 am
Without anything additional its working with 5V, but i dont want to risk damaging the sd card.

I tried voltage dividers for the lines CS, MOSI and SCK -1,8K and 3,3K. For the first 2 lines its ok, but as soon as SCK gets its divider it stops working.

What could i try to make it work?
175  Using Arduino / Storage / Re: Could Ardu be accessed in Win as a Harddisk? on: July 03, 2012, 03:34:34 pm
do you maybe have a source why its impossible? i cant imagine that id be that first who thinks that that would be very handy.

maybe not as a harddisk but just in a way that you would not have to pull out the sd card and put it in a reader to get access to the txts
176  Using Arduino / Storage / Re: Could Ardu be accessed in Win as a Harddisk? on: July 03, 2012, 02:47:07 pm
Thx for your response.
i just found this in some FAQ:

"The big thing that is nice about the 8u2 is that advanced users can turn it into a different kind of USB device. For example it can act like a keyboard or mouse. Or a disk driver. Or a MIDI interface, etc. Right now there are no examples of how to do this, but we hope to post some shortly."

But they r wrong? :-(
177  Using Arduino / Storage / Could Ardu be accessed in Win as a Harddisk? on: July 03, 2012, 02:33:35 pm
Hi,
Is it possible to somehow access an ardu with maybe a SD module as regular harddisk in Windows? In a way that i would not need to pull out the SD card and put it into a SD reader?
178  Using Arduino / Sensors / Re: new to arduino and confused with a sensor shield on: July 01, 2012, 06:25:14 am
http://arduino-info.wikispaces.com/SensorShield
179  Using Arduino / Storage / Re: Is there a SD Tutorial? on: June 30, 2012, 03:17:45 pm
thx,

does that mean i can try with dividers, and if it doesnt work i can put the whole module into the garbage?
180  Using Arduino / Storage / Re: Is there a SD Tutorial? on: June 30, 2012, 11:49:34 am
thx,
so you would strongly advise me to use the divider?
i only have 1k resistors, would that be sufficient? i also have somewhere 100k i think, that would be better, right?

Im just wondering why there r like 30 sellers on ebay for exactly this sd module without anyone mentioning that u d need some external things like resistors to make it properly work. so i guess like 90% would just connect it to ardu like every other sd module with lvl shifters...
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