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76  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Enclosure for RFID Reader? on: August 11, 2010, 03:37:39 pm
You can get the blanks from any electrical wholesaler.  They screw onto a backbox (wall box?  It's a back box in the UK smiley-grin)

77  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Enclosure for RFID Reader? on: August 07, 2010, 06:00:58 pm
You could get some custom cut out of Acrylic... properly bonded together they'll be waterproof... and having the top layer flat... you can have the LED's recessed, but visible when lit.

That way at least you can have a sleek look, choice of colour AND have the functionality that you want.  

If you're worried about eeejits smashing them up, you could always go for lexan smiley-grin
78  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino Mega powered by auto battery question on: August 08, 2010, 07:34:20 am
Freely available...

http://cgi.ebay.co.uk/CAR-ALARM-DUMMY-12v-BRIGHT-FLASHING-RED-LED-/110567674412?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19be58d22c

Just one example
79  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Buying components from eBay? on: July 30, 2010, 08:10:23 am
I've bought stuff (in general) from China for years.  Never have I had a problem.  Recently, bought LEDs, LED matrix boards, and a few other odds n sods... the shipping on it was quicker than a guy that lives about 30 miles away from me on a first class post item (large letter size)
80  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: What project can I do with the following items? on: August 06, 2010, 04:29:12 am
and to add (on the pictures front) flickr allows you to comment on your photo's, which I find quite handy
81  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: LCD red on black availability on: August 05, 2010, 01:45:24 am
and a 20x2

http://www.crystalfontz.com/product/CFAH2002Y-RDI-ET.html
82  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Dumb Potentiometer Question on: August 04, 2010, 05:07:51 pm
Yeah, ignore me... I was just adding to the thread dumb factor, lol  smiley-grin
83  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Dumb Potentiometer Question on: August 04, 2010, 12:48:03 pm
With the right hand circuit, if you need 5K Ohms in the circuit, wouldn't you need to use a 10K pot to get that 5K load with the two leads effectively putting the two resistance loads in parallel, or am I missing a trick here?  (I assume of course that that is already factored into the circuit... )
84  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Controlling Resistance on: August 03, 2010, 12:33:11 pm
Hi Jerry,

That's exactly what I'm aiming to achieve.

I don't, however, have an oscilloscope to measure said wave form... mebbe making an oscilloscope first is on the cards smiley-grin

I think it may be easier (famous last words) to rip it open, and check the specs of the timer chip, then retro-fit it with some form of current changing circuit.
85  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Controlling Resistance on: August 03, 2010, 01:56:14 am
The creator kindly got back to me without me having to get the hammer out (in truth I haven't had time... )

Quote
The resistor limits the amount of current charging up the capacitor in the timer chip, hence when you adjust it you get slower or faster waveforms, you would have to try an provide 0 ohm to 1M relating to your speed some how

Now to get said gear out and measure how much the current changes.
86  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Controlling Resistance on: August 01, 2010, 02:19:55 pm
Got a very conclusive answerr to the quetion around what the pot is doing from the original creator.

Quote
If using the cars speed to adjust the assistance you would need a magnetic pickup that could give at least 4 square wave 12V pulses per wheel revolution as the original column uses the corsa's abs sensors to provide the 12V pulses, the POT adjusts the timing for the chip inside not adjusting any voltage im afraid

That's part common sense and part gibberish to me :o

The pulses per rev is simple... the rest is sheer luncay. smiley-grin
87  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Controlling Resistance on: August 01, 2010, 01:08:15 pm
Yeah, I'd thought of that, but then if I can get it completely pot free it'd remove a weak link in the chain.

I've asked the creator if he'll roll over and give me the spec for that part of the circuit.  If he doesn't... it's hammer time!
88  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Controlling Resistance on: August 01, 2010, 10:42:11 am
ahaaaa... good question!  I shall try and find out.  The controller is just a box of tricks at the moment, and not installed.  Will contact the designer to find out.
89  Forum 2005-2010 (read only) / Frequently-Asked Questions / Controlling Resistance on: August 01, 2010, 07:41:41 am
Please help out a frustrated person.

I cannot for the life of me figure out how to control the resistance of a circuit using arduino.

The parts I need to control are...
  • Electric Power Steering
  • Power Steering Controller (off the shelf) that controls the errr.. power steering
The process is as follows currently.  Both parts are controlled via standard car power (say 12v for simplicity sake).  The Control Box has a potentiometer on it that allows the driver to adjust the amount of assist that the steering column offers.  Dead easy.  At speed, you'd want the power steering less active and at low speeds (for example parking) you adjust the resistance of the pot to make the steering really light.

That's all great, except I don't want a pot in the equation that I have to adjust manually.  I can read the speed off the vehicle using an output of my ignition controller.  So we have an input signal.

What is really frying my brain is how to control the amount of resistance across two points in the circuit.

Cheers
90  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Does wire length effect performance? on: July 29, 2010, 01:50:37 pm
True, but the OP didn't say what he was intending to use the lengths for?
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