Magic: The Mini-magic Switchboard should I make it a kit? - Page 6 - Electronic Circuits Projects Diagrams Free

**3v0** · 21st January 2008, 02:42 AM

Students will like it, but the real fun will be the other teachers.

Sort of funny. You doing the programming and me the hardware.....

EDIT: If you want a board I can make two. Connectors are all .1 pinheaders.

blueroomelectronics · 21st January 2008, 03:02 AM

I'd love a PCB, and thanks Marks256 for the food colouring tip.
PS the code will be interrupt driven, of course you can change it as it'll be trimmed down to simply work.
Two interrupts,
TMR0 (about once per second) will update a counter and sleep / reset
INT_on change PORTB for the switches
That's all you need really.

kchriste · 21st January 2008, 03:55 AM

Quote:

Originally Posted by 3v0

Board is 2.3 x 1.5 inches
Updated schematic
Added board and foil images 300dpi
Will post eagle files if requested

Looks good. Just a few thing things I noticed. The drill holes on some pads appear to be off center for some reason. You might want to use SMD jumper pads to keep costs down:

**3v0** · 21st January 2008, 04:07 AM

We still need to come up with switches for the thing. Any ideas?

kchriste:
Thanks for looking.
I do not plan on making more then a few boards. On the ones where I know LEDs will not be used I will put traces between the pins of the jumpes.

What I posted was generated by Eagle's EXPORT>IMAGE. I do not think the holes will be offset if I print it directly from Eagle. The again it was the new beta version,

Krumlink: Let me know if you want one ?

Marks256 · 21st January 2008, 04:21 AM

I vote homemade knife switches. But then again, this isn't my project...

I think they would be fairly easy to make.

blueroomelectronics · 21st January 2008, 04:22 AM

Off PCB toggle switches are pretty common. SPST is all one needs.

**3v0** · 21st January 2008, 04:40 AM

Knife switches are cool but I do not think they go well with the illusion. The regular switches and bulbs make people think it is simple not strange.

I have seen switches with handles like a rod. One could slip caps over them but you would have to find or make the caps. Maybe heat shrink oVer a tube with a magnet sort of thing. Or maybe polyclay.

blueroomelectronics · 21st January 2008, 04:45 AM

Coloured (painted) washers might work.

Marks256 · 21st January 2008, 04:48 AM

Or small painted wooden dowels with holes drilled in the bottoms with a magnet in them.

kchriste · 21st January 2008, 04:56 AM

These switches have the option of snap on caps for their K toggle switches:
http://www.nkkswitches.com/pdf/Btoggles.pdf
You'd need to file the bat handle a bit, or drill out the cap, to make it easier to move the colored caps around.

blueroomelectronics · 21st January 2008, 05:14 AM

This one uses a plastic washer approach.

**3v0** · 21st January 2008, 05:24 AM

Quote:

Originally Posted by kchriste

These switches have the option of snap on caps for their K toggle switches:
http://www.nkkswitches.com/pdf/Btoggles.pdf
You'd need to file the bat handle a bit, or drill out the cap, to make it easier to move the colored caps around.

They would be great, do you know who stocks them. Digikey has there products but does not stock these.

I sort of missed what you were talking about on the SMD solder pads. The concept is/was new to me. I took a while but I got it. Thanks

kchriste · 21st January 2008, 06:10 AM

Quote:

Digikey has there products but does not stock these.

That's where I found them.... Didn't notice the non-stock issue.

Bill's idea of colored washers is looking better and better. Just choose an oversized washer that fits over the switch, paint it and drop it over the bat on a toggle switch so it settles on the mounting shaft.

Quote:

I sort of missed what you were talking about on the SMD solder pads. The concept is/was new to me.

Where I used to work they used SMD jumpers on all their PCBs for rarely used options and regular 0.1" header types for more commonly used options.

**3v0** · 21st January 2008, 07:06 AM

Quote:

Originally Posted by kchriste

Bill's idea of colored washers is looking better and better. Just choose an oversized washer that fits over the switch, paint it and drop it over the bat on a toggle switch so it settles on the mounting shaft.
Where I used to work they used SMD jumpers on all their PCBs for rarely used options and regular 0.1" header types for more commonly used options.

I will be using the washers at least to start with.
But I do think that the removable handles are better for the illusion. It makes the prey think they are fixed to start with.

Rev 1B now uses SMD jumpers. See previous post.
Anyone who wants to do their own board should download Eagle 4.92 and print directly from it. The foil provided here should work but is not as neat.

wmmullaney · 21st January 2008, 03:19 PM

Bill, you mentioned a pic16f628a at 35 k hertz, how do you tell the pic to operate at that speed? (It is NOT in the configuration word)

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21st January 2008, 02:42 AM	(permalink)
3v0	Students will like it, but the real fun will be the other teachers. Sort of funny. You doing the programming and me the hardware..... EDIT: If you want a board I can make two. Connectors are all .1 pinheaders. Last edited by 3v0; 21st January 2008 at 02:46 AM.

21st January 2008, 03:02 AM	(permalink)
blueroomelectronics	I'd love a PCB, and thanks Marks256 for the food colouring tip. PS the code will be interrupt driven, of course you can change it as it'll be trimmed down to simply work. Two interrupts, TMR0 (about once per second) will update a counter and sleep / reset INT_on change PORTB for the switches That's all you need really. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

21st January 2008, 04:07 AM	(permalink)
3v0	We still need to come up with switches for the thing. Any ideas? kchriste: Thanks for looking. I do not plan on making more then a few boards. On the ones where I know LEDs will not be used I will put traces between the pins of the jumpes. What I posted was generated by Eagle's EXPORT>IMAGE. I do not think the holes will be offset if I print it directly from Eagle. The again it was the new beta version, Krumlink: Let me know if you want one ? __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

21st January 2008, 04:21 AM	(permalink)
Marks256	I vote homemade knife switches. But then again, this isn't my project... I think they would be fairly easy to make. __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

21st January 2008, 04:22 AM	(permalink)
blueroomelectronics	Off PCB toggle switches are pretty common. SPST is all one needs. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

21st January 2008, 04:40 AM	(permalink)
3v0	Knife switches are cool but I do not think they go well with the illusion. The regular switches and bulbs make people think it is simple not strange. I have seen switches with handles like a rod. One could slip caps over them but you would have to find or make the caps. Maybe heat shrink oVer a tube with a magnet sort of thing. Or maybe polyclay. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time) Last edited by 3v0; 21st January 2008 at 04:43 AM.

21st January 2008, 04:45 AM	(permalink)
blueroomelectronics	Coloured (painted) washers might work. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

21st January 2008, 04:48 AM	(permalink)
Marks256	Or small painted wooden dowels with holes drilled in the bottoms with a magnet in them. __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

21st January 2008, 04:56 AM	(permalink)
kchriste	These switches have the option of snap on caps for their K toggle switches: http://www.nkkswitches.com/pdf/Btoggles.pdf You'd need to file the bat handle a bit, or drill out the cap, to make it easier to move the colored caps around. __________________ --- The days of the digital watch are numbered. ---

21st January 2008, 05:14 AM	(permalink)
blueroomelectronics	This one uses a plastic washer approach. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

21st January 2008, 03:19 PM	(permalink)
wmmullaney	Bill, you mentioned a pic16f628a at 35 k hertz, how do you tell the pic to operate at that speed? (It is NOT in the configuration word) __________________ Regards, William Mullaney "HOPE for the best, EXPECT the worst, ACCEPT whatever comes." http://wiliamsville.myminicity.com/ http://wiliamsville.myminicity.com/ind/ http://wiliamsville.myminicity.com/tra/ http://wiliamsville.myminicity.com/sec/