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16  Using Arduino / Programming Questions / char to int on: April 11, 2013, 03:33:39 pm
its been a while since i coded arduino c++ 

i forgot what was the function to convert from char to int  (including char values as ascii zero or asci 32 )
17  Using Arduino / General Electronics / Re: where to get info about ledseedunio ? on: April 11, 2013, 08:55:01 am
well it looks different, i added a photo below

18  Using Arduino / General Electronics / where to get info about ledseedunio ? on: April 11, 2013, 08:00:47 am
on my desks i have 4 ledseedunio 's a college gave to me.
I couldnt find any info about them does someone know of a weblink with some info about jumpers and generally how to control it ?

Its a shield with 10 mosfets to control leds
19  Using Arduino / Programming Questions / Arduino DUE 3.3 volt question (vs Arduino Mega ADK) on: April 05, 2013, 10:35:03 am
I am comparing 2 arduino mega's.
Both seam quite similar but the Due runs on 3.3 volt.

Does it mean that if i set a pin to high that it's voltage will be 3.3 volt ??, and is that enough for normal shields ? might some shields not work on it?

I am planning to use a mosfet shield to drive lots of leds
20  Using Arduino / Programming Questions / Re: Other options to upload / execute arduino software on: March 01, 2013, 11:00:37 am
well the reason is i'm considering an automated deployment street for arduino, just a spin of the mind
21  Using Arduino / Programming Questions / Other options to upload / execute arduino software on: March 01, 2013, 10:46:57 am
I was wondering is there other software perhaps command line software to upload a sketch to an arduino board and run it ?
( perhaps with a pre compile first )
22  Using Arduino / Programming Questions / Re: who does recognize this shield ? on: February 27, 2013, 02:10:23 pm
their not helpful their product isnt mentioned. (and cannt be stacked with their other relayboard it seams, or this one is broken)... but its all guessing ....no manual
23  Using Arduino / Programming Questions / who does recognize this shield ? on: February 27, 2013, 01:42:07 pm
Anyone recognizing this relay shield ?
I would d love to get a manual for it somewhere
Where i got it from (DFrobot) is not providing me a manual
I suppose it might be s simple copycat of another vendor.
 smiley-confuse


The point is it has some dip-switches 6 or so and an additional switch on top.
24  Using Arduino / General Electronics / Re: manual and smaple code for DFRobotics relay shield 2.1 on: February 26, 2013, 05:21:17 pm
Thanks handy for the abbreviations written on the board.
But the point is the 2.1 board has some switches, and i like to know their function too.

I asume this board might use some other protocol to switch and those switches might set ID's or something like that.
25  Using Arduino / General Electronics / manual and smaple code for DFRobotics relay shield 2.1 on: February 26, 2013, 02:34:56 pm

I asked a friend of me to (help him) to buy a plain 8 port relay for his arduino project.
To my surprise he came  back with 2 Arduino compatible shields from DFRobot both are 4 ports. (2 times 4 makes 8 too)
One is the 1.2 version and the other is the 2.1 version.

The 2.1 version is a mystery for me,
Even Google image search doesn't know of its assistance.
I couldn't find any documentation on their site about this product, but based on their forum some people use it too.
So i was hoping maybe someone knows where the manual can be downloaded, and the sample code.

Another thing i note these boards have a power connector, that surprises me a little as a relay board shouldn't use that much power wouldn't an Arduino Uno be enough to power them ?, or is it common that shield boards have a power connector, i never before had the luxury of a real arduino compatible shield.. so i wonder why this is  (they didn't put 2 extra DC adapters in.. so i doubt its required).

PS (i asked this question on their site too, but out of experience i know the most advanced arduino engineers are on this site, i think i will have better luck here)
26  Using Arduino / General Electronics / Arduino + 12v signal electronics on: February 22, 2013, 04:51:18 pm
Hello

A lot of industrial communication is done using 12v instead of 5v, not sure why but it is that way.
From what i have heard very little amps but 12v, as a power for signal only .

I was thinking i need to interface a machine that uses 12v; in its bus it also provides +12v and ground, if i connect other pins to this 12v it performs some actions.
One way of doing this would be using relays, i think their safe to use and prevent wrong currents into the arduino.

Might it also be possible to connect the ground of the bus to the arduino ground; and use transistor ( or mosfet? ) so that an arduino pin out triggers the fet with 5v (well perhaps put a resistor for less there) and then the transistor would connect my device bus ?  (perhaps put in a diode too, to prevent against wrong currents.  (what kind of transistor / mosfet should i use?)
27  Using Arduino / Programming Questions / Re: How to do exact time blinking for a Led on: February 05, 2013, 06:21:27 pm
Ehm why 1/200   1/250 ?
Wouldnt it be roling shutters on a usb webcam ?
28  Using Arduino / Programming Questions / Re: How to do exact time blinking for a Led on: February 05, 2013, 02:16:58 pm
Dough you gave an interesting answer, since i didn't knew how usb camera's get triggered.

I wanted to make a long movie using a strobe scope but was worried that the strobe scope might get out of sync.   (and so i wanted to test it how precise its timing was)
29  Using Arduino / Programming Questions / How to do exact time blinking for a Led on: February 05, 2013, 01:46:56 pm
Well i would like to check the frequency of my camera, to checkout if it really does 30fps  or 29.5 fps  or 32fpsb...  etc
While thinking about this, it isnt difficult for me to blink a led, but how would one do accurate timing?
Since each instruction also does cost time
30  Using Arduino / Project Guidance / Re: Which arduino mega ? on: January 18, 2013, 07:29:10 pm
Well actually i have been thinking seriously about the shift registers board too, and a lot of thanks for that !.

Though i think programmable boards might allow me to add some more fun, extra tricks
Also i know how to program them so it would speedup building and i might have good use for them after this is over.
I can use 1 smaller arduino board to drive 2 mega versions it would be under 130 euro total.
Excluded other electronics

If it where a permanent thing i would have gone for your version.
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