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johnboiles

Member Since: February 12, 2008

Country: United States

  • I’m trying to use one of these to drive some of the 6.5" 7-segment digits with their drivers (5V logic) from a Raspberry Pi A+ (3.3V GPIO). Works great for four digits. When connecting the fifth digit however, the logic levels get murky on both the a and b pins for this board. On the 3.3V side (A pins) the signal gets pulled up a bit and on the 5V side (B pins) the signal floats around 2.5V. The supplies seem steady at 3.3V and 5V so I don’t think it’s a supply issue. Seems like this board is confused about the direction it should be shifting signals. Any ideas?

  • WARNING: before soldering, I’d strongly recommend putting a piece of tape on the back of this board to insulate the vias from the exposed copper traces on the 7 segment display.

    On my board, the via connected to pin 10 (RCK) on the shift register wasn’t fully covered by the solder mask and ended up bridging with the exposed 12V trace on the back of the 7 segment board. This caused a short from 12v to pin 10 (RCK) on the shift register, which made ~12V available on all the input pins as well as the 5V pin. I fried a couple Arduinos before I figured out what was happening. Seems like the shift register is fried too. Now that I’ve pulled it off the 7 segment board it’s no longer trying to supply 12V on all the input pins, but it doesn’t seem to do anything anymore.

    I’m going to order some new shift registers and try to salvage the board :(

  • WARNING: before soldering, I’d strongly recommend putting a piece of tape on the back of this board to insulate the vias from the exposed copper traces on the 7 segment display.

    On my board, the via connected to pin 10 (RCK) on the shift register wasn’t fully covered by the solder mask and ended up bridging with the exposed 12V trace on the back of the 7 segment board. This caused a short from 12v to pin 10 (RCK) on the shift register, which made ~12V available on all the input pins as well as the 5V pin. I fried a couple Arduinos before I figured out what was happening. Seems like the shift register is fried too. Now that I’ve pulled it off the 7 segment board it’s no longer trying to supply 12V on all the input pins, but it doesn’t seem to do anything anymore.

    I’m going to order some new shift registers and try to salvage the board :(

  • Has anyone gotten this to work with a makefile, such as http://ed.am/dev/make/arduino-mk/arduino.mk

  • I’m looking at the schematic and it looks like there’s either an error in the board or the schematic:

    The silkscreen on the board has pins on the bottom corner labeled 10, 16, 14, 15, A0, etc. The schematic shows those same pins as D10, MOSI, MISO, SCK, A0, etc. This is mostly ok as D16==MOSI and D14==SCK. However, D14 is not the same as MISO. According to the schematic, D14 is connected directly to the RX LED. Either the schematic or the silkscreen should be updated.

  • Yep, it was an error on Sparkfun’s part. They’re sending me the right one. Thanks Sparkfun!

  • Heads up, the pinout for this GPS has TX and RX reversed from some of the the other 6-pin connector GPS’s that Sparkfun sells (such as #465 and #11466. It’s also reversed from the GPS units that 3DRobotics sells for Ardupilot. This can be easily fixed by switching the wires in the connector.

  • WARNING! This is a RP-SMA male connector, not an SMA female connector. At least that’s what I received. Perhaps this was in error. Contacting Sparkfun now.

  • Looks like SM06B-SRSS-TB in the con-jst2 library is the same as this part (Available from cadsoft http://www.cadsoftusa.com/downloads/file/con-jst2.lbr).

  • Is this the horizontal version of the EM406 connector (https://www.sparkfun.com/products/579)?

No public wish lists :(