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1  Using Arduino / Networking, Protocols, and Devices / Re: What support is there for CANbus interface on: January 27, 2014, 10:48:01 am
Don't mean to promote my kickstarter project, but check out canexIO project on Kickstarter.com, it is a perfect example.
2  Community / Exhibition / Gallery / Re: Kickstarter Project: canexIO, extend and expand your project's reach on: January 27, 2014, 10:45:07 am
FYI It seems all backers want the 3 nodes + shield reward, so I added a 5 nodes + shield reward.
3  Community / Exhibition / Gallery / Kickstarter Project: canexIO, extend and expand your project's reach on: January 26, 2014, 09:13:07 am
Hi guys,

I just got my project at Kickstarter up. Please help me out on this. Thanks

https://www.kickstarter.com/projects/pylin/canexio-extend-and-expand-your-projects-reach
4  Using Arduino / LEDs and Multiplexing / Re: 4 x 4 x 4 LED Cube with Shift Registers on: April 09, 2013, 10:25:02 am
Come to think of it, if MAX7219 is used, each plane needs 10 wires, 8 for anodes, 2 for common cathodes. For next plane, the 8 anodes wire can be wired together, only the 2 common cathode wires need to be separate.

So maybe wiring isn't that bad at all . . . no resistors, 7 more of it, we got a 8x8x8 cube with 8 MAX7219s
5  Using Arduino / LEDs and Multiplexing / Re: 4 x 4 x 4 LED Cube with Shift Registers on: April 09, 2013, 09:56:44 am
I have been having a goggle, and I found this 4 x 4 x 4 LED cube using a picaxe microcontroller. I'm not sure if this could be adopted to Arduino but it looks interesting. Anybody up for a conversion  smiley-cool

http://www.picaxeforum.co.uk/showthread.php?22115-4x4x4-LED-Cube-using-08M2-and-MAX7219&highlight=led+cube

That is cool!

If we think of 4x4x4 as 64 LEDs and think in rows and columns, build a layer of abstraction in software that turns rows and columns into x, y, z, we might have something going :-)

Then, from 4x4x4 as building block, we can build a much more complicated cubes, or something like 4x4x8, etc.
6  Using Arduino / LEDs and Multiplexing / Re: RGB Lamp based on Monitor dominant color on: April 08, 2013, 08:43:53 pm
There are color sensor available based on TCS3200. I have used this sensor before and it is pretty accurate and it has wide range of sensitivity. So, you do not even need to connect to PC, just point the sensor at the monitor.
7  Using Arduino / LEDs and Multiplexing / Re: 4 x 4 x 4 LED Cube with Shift Registers on: April 08, 2013, 08:41:09 pm
If you are not looking to change brightness of each LED individually, you can use MAX7219, but this will limit your design in the future if you decide to do that.
8  Using Arduino / Sensors / Re: IR sensor pulsing on: April 08, 2013, 08:36:03 pm
Use a VS1838 or something similar for your purpose.
9  Using Arduino / Project Guidance / Re: remote sensors - wich (wired) connection is better? on: April 08, 2013, 06:26:41 am
RS485 is a way to go along with Cat5 or Cat6 cables. Since your house has not been completed yet, it is much better to put in as much high quality cable as possible inside walls.

Also if total distance is not that much, you can also transmit 24V power over Cat5/Cat6 cable so that your switch or other remote devices does not have to be powered separately. Of course, do not transmit line power over it.

disclaimer: I am saying this because I have RS485 shield like that for sale so I am biased.
10  Using Arduino / Sensors / Re: Solar Tracker - Trouble Selecting Light Sensor on: April 07, 2013, 02:35:32 pm
Maybe you can select a different range for measurements, the resistance could never be zero (that would be a superconductor).

If you are using voltage divider sort of circuit for example, reduce your other resistor so that your divider circuit can produce the right range.
11  Using Arduino / Sensors / Re: Precision Potentiomter on: April 05, 2013, 06:45:53 am
@retrolefty and @JoeN, thanks for your answers.

But when it powers down and powers back up, what happens? A pot position can be read after power cycle.

I disassembled a 20 position mechanical rotary encoder before, it really is nothing more than two contacts arranged in a way that you can tell the direction. I assume optical ones would be the same, but could be made to have much more resolution . . . I had an optical wheel encoder that has 100 slots for one of my PID project, not good enough but works fine -- the robots "runs" funny initially :-)

No problem, but one last thing to consider.  Atmel microcontrollers all have EEPROM.  You can save the current position a second after the most recent change or so and you won't overburden the EEPROM write limits and read it back at power on.  The code is around here on this site and it's easy to use.

Thanks
12  Using Arduino / Sensors / Re: Precision Potentiomter on: April 04, 2013, 10:11:09 pm
@retrolefty and @JoeN, thanks for your answers.

But when it powers down and powers back up, what happens? A pot position can be read after power cycle.

I disassembled a 20 position mechanical rotary encoder before, it really is nothing more than two contacts arranged in a way that you can tell the direction. I assume optical ones would be the same, but could be made to have much more resolution . . . I had an optical wheel encoder that has 100 slots for one of my PID project, not good enough but works fine -- the robots "runs" funny initially :-)
13  Using Arduino / Sensors / Re: Precision Potentiomter on: April 04, 2013, 07:17:25 pm
I misunderstood at first that this is more about sensing the position of a knob that actually varying the resistance on a wire.

Quote
I need a pot that will work as a precise rotary position sensor, it will be connected to a 16bit ADC.

Anyway, if I read this right all he wants to do is connect a digipot to a ADC to get a value 0-65535 and use that as a human interface to something else.  Isn't that a bit of a Rube Goldberg solution?  I don't see why he doesn't use a good quality rotary encoder like this:

http://www.ebay.com/itm/BOURNS-ENS1J-B28-R00128-OPTICAL-ENCODER-/370592502534

I have a few of these.  The quality is incredible.

If, as the other poster said, "only 7 or 8 bits are accurate" (for the pot) then this is actually more precise anyway, and you do away with all the analog BS.



That optical encoder is interesting. Does it give you "absolute" position or just pulses when it rotates?
14  Using Arduino / Sensors / Re: how to focus an infrared light? on: April 04, 2013, 08:01:34 am
Hi there mjkzz,
If I do get the 3w ir led, wouldn't that fry my arduino?
According to dc42's link:https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQiEBg44h_5hg9FqHss6SMdKKP7yU7FvG438oU4XvOGS_-sR80D, would I connect uc_out to one of the arduino pin?

This is why I suggested using MOSFET and current limiting resistor to drive it because a 3W ones probably draws 1000mA.

Just a thought
15  Using Arduino / Sensors / Re: Precision Potentiomter on: April 04, 2013, 05:06:19 am
There are 10-turn precision pots (not those smaller ones, but just or bigger than the one in the link), though I never personally used them. I think the part number starts like 3450S-(resistance value) made by Bourns.

I believe linear precision (LIN?) is about 0.25%

here is a link:

http://www.mouser.com/ProductDetail/Bourns/3540S-720-202L/?qs=weytGAg3oVQLpFiVHU9%252b%252bQ%3d%3d

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