Pour info, le blog a bouge: http://melka.one.free.fr/blog/

Yep. :-)

Je ne serais pas te dire pourquoi... peut-etre afin de s'assurer d'avoir la session entiere chaque fois que tu lance la session terminal?

Moi je jure par LTspice/switcherCAD.

Tres complet, gratuit. Pas logiciel libre, mais si tu n'as pas d'objections morales sur ce point, ca devrait faire l'affaire.

http://www.linear.com/designtools/software/switchercad.jsp

Ah, I've never done it that way.  :-?

I usually just blip the button right at the beginning and let go immediately. Never had any issues with sketches loading and never had a two minute wait.

Any particular reason you hold the button down?

Only thing I noticed with mine is that without autoreset and the fairly long pause while the firmware waits at each boot, each cycle is noticeably longer than with, say, a diecimilla. But not two minutes...

Are you sure you're selecting the right serial port in the IDE? With my FTDI cable, the serial port only shows up in the list if it's already plugged in.

Sorry to hear that, looking forward to hearing what you do with it when you finally get it.  :-?

First step would be to figure out how much current each coil is drawing when in operation under 5 volts, and then come back here and ask for help picking something to drive twice that load (just to be safe).

I suspect you could build something quite serviceable with one or two transistors per coil, depending on the needed current.

Got an amp-meter and a strong source of 5V power?  :

Any idea how much current those electromagnets use when on? The arduino I/O pins may simply not be able to drive them directly.

If I misunderstood and there is already something between the arduino and the magnets, my apologies...

Hi again,

Looking at the website of the chip's manufacturer, I see that the max supply voltage is 5.5V with an absolute max rating of 6V, while I understand from your initial post that you are supplying it with 12V. Perhaps that explains why the circuit is not functioning as desired?

The chip may be dead as a dodo. Your arduino may not be too happy if it's getting 12V on any pins except the one for raw power to the voltage regulator.

As for selecting the resistor Rset between the power supply and the Iset pin, the same page seems to recommend a typical value of 9.53K for a current limit of 40mA sourced from your segments drivers, while the datasheet seems to recommend the same value as a minimum, and states that the current limit is 100 times the current flowing into the Iset pin.

I would assume that a resistor twice the value would create a current half the intensity and recommend to respect the minimum value for Rset. As for calculating Rset for a supply voltage of 12 volts, if that was part of your question, I would contend that the question is moot since at 12 V the IC should not be able to function.

I think Mike is asking how you have the various pieces connected or wired up.

Could you draw a diagram of which pins are connected to which components, for example? Perhaps a picture of the project?

I dunno about the bluesmirf, but I can confirm that powering the Wee from that corner works just fine in central New Jersey. ;-)

Hi, I use an Arduino Wee and have powered it from 9V on the RAW pin with no problems.

I used the GND on the same side, but I should think all the GNDs are connected so it shouldn't make a difference except perhaps for high frequency noise considerations which I believe are moot with a battery (as opposed to a walmart PS).

You are correct that it does not have auto-reset.

I use the FTDI cable from Sparkfun to talk to it, and so it was easiest to use the TX/RX/3.3/GND pins grouped together on the short side, since that configuration fits the cable's connector natively.

Have fun with your Wee!

Thank you for your persistence :-)

Alas, that has not solved the problem either. I have removed ServoTimer1.o, re-compiled my sketch, uploaded it and I still hang on delay().

Thanks for your reply, but I made the change you suggest to ServoTimer1.cpp and I still hang on delay() with the demo code in my initial post, and other sketches using ServoTimer1 library.

It must be something else...