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How can I find the SD card connector with Sparkfun.lbr?

 by unebonnevie ¦  Tue Aug 12, 2014 10:01 pm ¦  Forum: SparkFun Product Questions ¦  Topic: How can I find the SD card connector with Sparkfun.lbr? ¦  Replies: 1 ¦  Views: 311

Hi,

I used the Sparkfun.lbr EagleCad library for my projects. It has the SD card part. But I can't seem to find the connector that goes with that EagleCad part.

Anyone knows?

Thanks!

 by unebonnevie ¦  Mon Mar 09, 2009 10:10 am ¦  Forum: Code ¦  Topic: Part two: help on 74HC595 driving 8x8 LED MATRIX ¦  Replies: 5 ¦  Views: 6898

It would be better to use a high-side driver to drive
the LED matrix instead of shorting it out.
Example of high-side driver that is not PMOSFets? (I take you meant "high-side" being the common anode rows of the LED matrix.)

Part two: help on 74HC595 driving 8x8 LED MATRIX

 by unebonnevie ¦  Sun Mar 08, 2009 10:13 pm ¦  Forum: Code ¦  Topic: Part two: help on 74HC595 driving 8x8 LED MATRIX ¦  Replies: 5 ¦  Views: 6898

Hi, First of all, my apologies for not having drawn up a diagram yet. In my previous post ( see here ), I successfully drive 8x8 LED matrix using one 74HC595 to drive common anode rows, one 74HC7014 decade counter, whose outputs are connected to the ULN2803A (transistor array), to drive the common c...

 by unebonnevie ¦  Sun Mar 01, 2009 6:46 pm ¦  Forum: Code ¦  Topic: Help/tips with controlling 8x8 MATRIX LED ¦  Replies: 5 ¦  Views: 4429

Problem resolved! LOL and kicked myself! My 8x8 LED's row pins are ordered with pin numbers 22 (for row 1), 19, 16, 13, 3, 6, 9, and 12 (for row 8 ). Hecked! I connected the output of the 8 pins from the HC595 to the LED's pin 3, 6, 9, 12, 13, 16, 19, 22 in that order! WRONG! the hc595 output should...

 by unebonnevie ¦  Sun Mar 01, 2009 3:27 pm ¦  Forum: Code ¦  Topic: Help/tips with controlling 8x8 MATRIX LED ¦  Replies: 5 ¦  Views: 4429

Hmm. Time to research but no time to draw?
Yeah, too much inspiration :-) But I think I described thoroughly enough.

 by unebonnevie ¦  Sat Feb 28, 2009 11:16 am ¦  Forum: Code ¦  Topic: Help/tips with controlling 8x8 MATRIX LED ¦  Replies: 5 ¦  Views: 4429

thanks responding...Sorry I might have been not clear on the real problem, which is: If I wanted to display say, a row of 11111111, that is, light up 8 leds of a row, it works fine. BUT, when I have a zero in the binary data, e.g., 10111111, and want to display it (again as a row), the zero is unlit...

Help/tips with controlling 8x8 MATRIX LED

 by unebonnevie ¦  Sat Feb 28, 2009 5:01 am ¦  Forum: Code ¦  Topic: Help/tips with controlling 8x8 MATRIX LED ¦  Replies: 5 ¦  Views: 4429

Hi, I am able to hook up and control the 8x8 matrix led with an ATMEGA8 and the ST M74HC595, which can gives 8 output at once. I am hoping people here have some HC595 experience. My circuit is 5V DC and my ATMEGA8 is running at 1Mhz, the default clock. I am able draw the rows of dots without any pro...

 by unebonnevie ¦  Sat Dec 06, 2008 9:01 pm ¦  Forum: AVR Microcontrollers ¦  Topic: Explanation of 'sink' and 'source' plz? ¦  Replies: 2 ¦  Views: 1170

Thanks! That clears up a bit. I have common cathode 7-segments. Off to the tutorial :-)

Explanation of 'sink' and 'source' plz?

 by unebonnevie ¦  Sat Dec 06, 2008 3:27 am ¦  Forum: AVR Microcontrollers ¦  Topic: Explanation of 'sink' and 'source' plz? ¦  Replies: 2 ¦  Views: 1170

Doing some LED stuff...Seems to me that sinking is needed for common cathode LEDs and sourcing is needed for common anode LEDs? Apparently one has to buy the right driver. Thanks

 by unebonnevie ¦  Sun Nov 23, 2008 9:59 pm ¦  Forum: AVR Microcontrollers ¦  Topic: Real-time Clock (RTC) on ATMEGA8 or ATTiny? ¦  Replies: 7 ¦  Views: 8104

ATMEGA8 user guide says the below..My problem is I want to have my ATMEGA8 run at 16Mhz. The clock source for Timer/Counter2 is named clkT2S. clkT2S is by default connected to the main system I/O clock clkI/O. By setting the AS2 bit in ASSR, Timer/Counter2 is asynchronously clocked from the TOSC1 pi...

Real-time Clock (RTC) on ATMEGA8 or ATTiny?

 by unebonnevie ¦  Sun Nov 23, 2008 9:54 pm ¦  Forum: AVR Microcontrollers ¦  Topic: Real-time Clock (RTC) on ATMEGA8 or ATTiny? ¦  Replies: 7 ¦  Views: 8104

Ok, Yep, with coding and utilizing the timer interrupt, one can do an RTC with ATMEGA8, but, reading the ATMEGA8 user guide, I can't find discussion on RTC. It it takes lot of coding to support RTC and calendar, I am thinking of just getting the DS1307 RTC chip--about 70 cents and it offers many fea...

 by unebonnevie ¦  Sun Nov 23, 2008 9:49 pm ¦  Forum: AVR Microcontrollers ¦  Topic: transistors--the npn ones ¦  Replies: 5 ¦  Views: 1668

Thanks, all for the answers.

 by unebonnevie ¦  Sat Nov 22, 2008 3:39 am ¦  Forum: AVR Microcontrollers ¦  Topic: Good sound chip to use with ATMEGA8/168, etc.? ¦  Replies: 3 ¦  Views: 1291

I would to produce arcade kinds of sounds. Thx

 by unebonnevie ¦  Sat Nov 22, 2008 3:37 am ¦  Forum: AVR Microcontrollers ¦  Topic: Newbie question on wiring things on a proto/perf board ¦  Replies: 7 ¦  Views: 2130

Yes, I use proto boards with only annular rings.

transistors--the npn ones

 by unebonnevie ¦  Sat Nov 22, 2008 3:26 am ¦  Forum: AVR Microcontrollers ¦  Topic: transistors--the npn ones ¦  Replies: 5 ¦  Views: 1668

Hi,

Another newbie question...I have been reading schematics and seen a variety of transistors. Question is: Which ones to buy? (Of course, this depends on power and ampere ratings and a project's needs.) But, in general which would be good for beginners.

I've got some 2N2222 ones.

Thx