5x7 Matrix Issue - Page 3 - Electronic Circuits Projects Diagrams Free

AtomSoft · 11th November 2008, 11:11 PM

Yeah BeeBop... but it would be nice to have that little thing like a label part. Now with a N-Channel...

futz · 11th November 2008, 11:37 PM

Quote:

Originally Posted by BeeBop

Futz, nice board. Why don't you get rid of more of the square corners, though?

Quote:

Originally Posted by kchriste

I think it is still a Work In Progress. I can see 7 via's right off the bat that could be eliminated (From the center header on the lower edge of the PCB). Autorouter madness!

That was just a quick autorouter-only test. The board is far from finished.

As I do it I'm relearning all the stuff I used to know how to do in Eagle years ago but forgot. Still a ways to go...

futz · 11th November 2008, 11:51 PM

Quote:

Originally Posted by AtomSoft

I actually learned all i know from
Eagle Editor Tutorial

Here's a few more:
gaussmarkov: diy fx » Eagle 2: Libraries
ECE101 - Basic Electrical and Computer Engineering » Blog Archive » EAGLE Implicit Pins - Addlevel Explanation
Eagle Library Design

Quote:

I see you are still on the TI stuff. Hows it treating you? Is it living up to your expectations?

I still say, "Nice MCUs!". You can run em off fruit!

I don't care much for their IDE, but I can live with it. MPLAB sets a pretty high bar for MCU IDE's.

AtomSoft · 12th November 2008, 12:12 AM

Can anyone explain the use of a mosfet over a normal transistor?

AtomSoft · 12th November 2008, 12:17 AM

awesome links thanks and cool fruit stuff. I doubt if we had to run it off fruit it would be very usefull

maybe a watch? but then you lose time in between fruit

but thats cool!

AtomSoft · 12th November 2008, 12:25 AM

Found it Beebop

Under Supply 2:
V-->
V<--

COOL!

BeeBop · 12th November 2008, 12:37 AM

Quote:

Originally Posted by AtomSoft

Found it Beebop

Under Supply 2:
V-->
V<--

COOL!

God, I'm getting old! I didn't get what you were saying.

Difference between a MOSFET and bipolar transistor? In a 'nutshell,' the transistor is controlled by current - more current on the base turns it on harder, up to the point it saturates. The FET is controlled by voltage. There are two basic kinds - depletion mode and enhancement mode. With the depletion mode a voltage on the gate which is more negative with respect to source, chokes off the device so it doesn't conduct from drain to source. Enhancement mode FETs need a voltage on the gate to turn them on. IIRC

Quote:

I still say, "Nice MCUs!". You can run em off fruit!

I don't care much for their IDE, but I can live with it. MPLAB sets a pretty high bar for MCU IDE's.

I've heard tons of good things about the MSP micros. How will you burn the firmware into the chip?

BeeBop · 12th November 2008, 12:41 AM

Quote:

Originally Posted by futz

You can run em off fruit!

Ha, I just watched the video. You weren't kidding.

AtomSoft · 12th November 2008, 12:48 AM

Thanks Beebop... Im looking at the PICDEM FS USB User Guide at the schematic. Im wondering what they use that mosfet for. Looks like it blocks the VBUS (+) from the rest of the circuit if the user supplies power via adapter. Would that be correct?

futz · 12th November 2008, 12:56 AM

Quote:

Originally Posted by BeeBop

I've heard tons of good things about the MSP micros. How will you burn the firmware into the chip?

I bought one of these little Olimex JTAG programmer/debuggers. It's fully TI compatible so it works with their software. TI's JTAG uses a 2x7 header.

I also have a TI eZ430 Spy Bi-Wire unit.

Quote:

Ha, I just watched the video. You weren't kidding.

They're designed to run at ultra low power levels and just blip up to high speed in short bursts when needed.

BeeBop · 12th November 2008, 01:04 AM

Quote:

Originally Posted by AtomSoft

Thanks Beebop... Im looking at the PICDEM FS USB User Guide at the schematic. Im wondering what they use that mosfet for. Looks like it blocks the VBUS (+) from the rest of the circuit if the user supplies power via adapter. Would that be correct?

Sound correct to me. With no voltage at pin 3 of the regulator, the gate is pulled down to ground by R22. When the user plugs in an adapter there is a positive potential on the gate which shuts down the fet. Quite an idea; I'll have to remember that one.

BeeBop · 12th November 2008, 01:09 AM

Quote:

Originally Posted by futz

I bought one of these little Olimex JTAG programmer/debuggers. It's fully TI compatible so it works with their software. TI's JTAG uses a 2x7 header.

I also have a TI eZ430 Spy Bi-Wire unit.

They're designed to run at ultra low power levels and just blip up to high speed in short bursts when needed.

Sweet!

I'm surprised you didn't get them over at SparkFun. Ah, it's a canuck site; going to have to have a look around that one. Thanks.

I'm going to have to watch your progress on this one!

AtomSoft · 12th November 2008, 03:50 PM

My version of that PICDEM FS USB board. Less Parts. Full PORTB output for use with w/e. Fully usb powered (or ICSP powered).Should be smaller and will make it have like a small expansion port. like 6-10pin for various addons. For testing. Mainly for me but since im posting the schematic feel free to use it for w/e. Im making this mainly to be a cheaper solution to the original microchip PICDEM FS USB.

Original $60

Mines would cost maybe $20 (max) to make Once you figure in the PCB Creation. The most expensive part would be the PCB & the PIC itself

SMUGangsta · 12th November 2008, 08:01 PM

Just a suggestion, but if your including the programming header, AND allowing full access to port B, I think you should include the protection circuit (from the datasheets) that prevent the external circuit from interfereing with the programming and vice versa.

It wouldnt matter on a normal circuit, but on a board designed to be 'played' with - I would highly recommend this.

AtomSoft · 12th November 2008, 08:40 PM

I shift over from datasheet pdfs to tips & tricks pdfs to manual and am always changing add/removing items. Thank you for the tip... ill be sure to add that in.

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12th November 2008, 12:12 AM	#34
AtomSoft	Can anyone explain the use of a mosfet over a normal transistor? __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

12th November 2008, 12:17 AM	#35
AtomSoft	awesome links thanks and cool fruit stuff. I doubt if we had to run it off fruit it would be very usefull maybe a watch? but then you lose time in between fruit but thats cool! __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

12th November 2008, 12:25 AM	#36
AtomSoft	Found it Beebop Under Supply 2: V--> V<-- COOL! Attached Thumbnails __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics Last edited by AtomSoft; 12th November 2008 at 12:40 AM.

12th November 2008, 12:48 AM	#39
AtomSoft	Thanks Beebop... Im looking at the PICDEM FS USB User Guide at the schematic. Im wondering what they use that mosfet for. Looks like it blocks the VBUS (+) from the rest of the circuit if the user supplies power via adapter. Would that be correct? Attached Thumbnails __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

12th November 2008, 03:50 PM	#43
AtomSoft	My version of that PICDEM FS USB board. Less Parts. Full PORTB output for use with w/e. Fully usb powered (or ICSP powered).Should be smaller and will make it have like a small expansion port. like 6-10pin for various addons. For testing. Mainly for me but since im posting the schematic feel free to use it for w/e. Im making this mainly to be a cheaper solution to the original microchip PICDEM FS USB. Original $60 Mines would cost maybe $20 (max) to make Once you figure in the PCB Creation. The most expensive part would be the PCB & the PIC itself Attached Thumbnails __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics Last edited by AtomSoft; 12th November 2008 at 03:52 PM.

12th November 2008, 08:01 PM	#44
SMUGangsta	Just a suggestion, but if your including the programming header, AND allowing full access to port B, I think you should include the protection circuit (from the datasheets) that prevent the external circuit from interfereing with the programming and vice versa. It wouldnt matter on a normal circuit, but on a board designed to be 'played' with - I would highly recommend this. __________________ There will come a day when PICs will rule the world!

12th November 2008, 08:40 PM	#45
AtomSoft	I shift over from datasheet pdfs to tips & tricks pdfs to manual and am always changing add/removing items. Thank you for the tip... ill be sure to add that in. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics