Spent the day yesterday figuring out the 2.8 touchscreen functionality. Was having trouble getting the examples to work for the tft. Finally found the issue on a forum where I had to change a parameter in the H file for the arduino to recognize it. Works fine now.

In Naudins circuit, I have some questions.

The diode across the coil. It is set up to freewheel the inductor after the fet releases it. If thats the case, how does anything get back to the battery? The buz11 has an internal diode, that is in the proper direction to send current back to the battery. But does the bemf go to the battery via the internal diode, or does it just loop through the coil and D1?

I copied the circuit to show what I mean.

The one with the red lines show the current when the transistor is on and it flows clockwise, - to +, if we follow electron flow. Then typically when the coil collapses when the fet turns off, the coil current should still flow forward and through D1(blue lines counterclockwise) till dissipated into the coil. Hmm.

Will have to try it to see. Im going to use a coil that is in the 2mh range so I will have to shorten the on times as compared to the 5mh used by Naudin. I could use 2 in series, using the 2 to drive the rotor to get closer to 5mh. Will try some things.

Looks like adapting the touchscreen can be integrated to work in place of the lcd/button shield board. Might take a bit of time getting the program sorted out, but should work.

Mags

@Mag if you can walk into a radio shack buy all you can they are going to close around 200 places I have seen higher. Just saying

Quote from: dtard on April 29, 2013, 08:14:32 PM
@Mag if you can walk into a radio shack buy all you can they are going to close around 200 places I have seen higher. Just saying

Yeah, I know. When I was a kid, RS was my candy store. I quit candy for RS!!! 

Now what?  lol   Eh, it was just convenient to go now and get what you need, when you need it. As for me, I always want it now when it comes to this stuff. Also Just wanted to let the people here know if they were interested in this stuff it could be had locally for about the same price as online. While it lasts.


I should have gotten into these things way back. I learned machine and assembler, self taught, back with the TRS80 Color computer. 0.88mhz(1.69mhz with a POKE).  MC6809 processor 4k ram expanded to 64kb.  lol Like 1980 or so. This stuff is very similar so it isnt a problem getting used to.

Mags

Ok, I see what I was missing. The 'other' schematic is on another page.

http://jnaudin.free.fr/dlenz/DLE24en.htm


Mags

Quote from: Scorch on April 05, 2013, 07:07:13 PM
My new experimental kit has arrived.
The over-all appearance of the kit, and documentation, looks really good and does appear to be high quality including a substantial number of custom engineered, precision machined, components.

Some assembly required. . .

}:>

I got the same kit, but as you, I think the instruction are very vague, there is not theory of operation, there is no schematic, there is no instructions of how to orient the coils with respect to the magnets... etc etc etc..