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1  Products / Arduino Due / Re: Connecting an Ethernet PHY to Arduino Due on: February 25, 2013, 03:24:41 pm
Hello Palliser

My; that looks a lot neater, and hopefully stop any gremlins with wire lengths.
It will be interesting when you receive the DM9161, is this mounted on a carrier with the jack/magnetic's similar to the DP83848 board ?

The POE is very easy to achieve with suitable Jack socket, as similar to the Arduino Ethernet, and a ready built POE module can then be soldered in
these can range in voltage from 3.3V upwards so can be selected to give the voltage that's required and additional Voltage regulators used for lower voltages if needed.
some such as the silverline range can have there outputs modified, the usual 12V from the 9012-S POE module is reprogrammed with a shorting link to only supply 9V so not to overheat the fixed 5V regulator on most of the Arduino boards.

I'll keep and eye open for developments and wish you success

BR
Graham
2  Products / Arduino Due / Re: Connecting an Ethernet PHY to Arduino Due on: February 24, 2013, 05:58:17 pm
Hi Palliser

I'm also interested in this, I'll likely go and make my own board (not a shield )to add onto a TAIJIUINO so I can pick up the additional pads, I'll design this board with 802.3af POE hence why I'll design my board around components that have been proved to work 1st smiley-wink
I wish you luck...  I did wonder if the breadboard wiring may be causing an issue with its failure; have you tried to shorten the wiring at all ??

BR
Graham
3  Using Arduino / Project Guidance / Re: IC w/ individual PWM for 3wRGB (Cat4109 vs LM3406) on: February 24, 2013, 06:53:38 am
Sjim

Have a look at these two items
http://www.ebay.co.uk/itm/Arduino-6-channel-led-shield-3-currents-can-be-set-0-35-0-7-1A-/370745850727?pt=LH_DefaultDomain_0&hash=item56522cbb67

http://www.ebay.co.uk/itm/Arduino-FET-shield-/370593835709?pt=LH_DefaultDomain_0&hash=item56491d2abd][url]http://www.ebay.co.uk/itm/Arduino-FET-shield-/370593835709?pt=LH_DefaultDomain_0&hash=item56491d2abd[/url]

The 1st may help with what you have in mind ??

BR
Graham
4  Using Arduino / LEDs and Multiplexing / Re: PCA9685 + MOSFET - PWM MR16 Led Downlights on: February 24, 2013, 06:44:27 am
Hi Jake
In dimmer control circuits, it is usual to use a look-up table, and use the value in that to set the brightness of a lamp.
This is because all lights including LED's don't have a linear response to the PWM level against brightness

i.e.  0% (0) would be off    100% (255)= full on   but 50%(128) s unlikely to be half brightness more likely 40% brightness and as it gets 'darker' so the linearity gets worse .
Also works at the top end; setting 80% PWM  maybe much nearer 100% brightness  something like 85+% brightness..

The look up table has a series of values that represent the PWM value for each brightness required, and will give he illusion of a 'linear' brightness as you fade in up and down.
The look up table is an array of values that convert the brightness level either 0-100 or 0-255 and as an example, and convert it to a value to use for the PWM value.

http://en.wikipedia.org/wiki/Dimmer#Dimming_curves  this is for tungsten lamps often used in theaters
http://doityourselfchristmas.com/forums/showthread.php?19487-Empirical-LED-Dimming-Curve  a forum discussion

I hope this may be of some help.

BR
Graham
5  Using Arduino / Networking, Protocols, and Devices / Re: New ethernet shield? on: January 29, 2013, 07:45:23 pm
If anyone is interested try this for the UDE Jack .
http://liketheocean.tistory.com/166

and download  BS-RB10202(0202)RB1-125BHQ1A.PDF

BR
Graham
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