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4 Digit Seven Segment LED Displays.


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#1 Jstaple21

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Posted 20 June 2012 - 05:45 PM

I'm not very good at this yet, so, I was hoping that someone might be able to point me in the proper direction. I have an application where I would like to use 2, 4 digit seven segment displays. The P/N's are BL 056C 4343UHR-11. I will be using a Netduino or a Netduino Plus (I have both). There are 14 pins on each set of 4 digits displays. I think that what I need is something like Adafruit's LCD backpack, but for LED's. I can also use some LED IC's; or, I am going to have to use a Go and gang the shields; but, I am looking for something a little more elegant (not to mention portability is a concern). I would like to know is there is a backpack analog for LED's. In earlier posts, there was a mention of a "SandBox". The link went nowhere. Is there a "SandBox"?

#2 Dan Morphis

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Posted 21 June 2012 - 02:05 PM

I'm not very good at this yet, so, I was hoping that someone might be able to point me in the proper direction.

I have an application where I would like to use 2, 4 digit seven segment displays. The P/N's are BL 056C 4343UHR-11. I will be using a Netduino or a Netduino Plus (I have both). There are 14 pins on each set of 4 digits displays. I think that what I need is something like Adafruit's LCD backpack, but for LED's. I can also use some LED IC's; or, I am going to have to use a Go and gang the shields; but, I am looking for something a little more elegant (not to mention portability is a concern).

I would like to know is there is a backpack analog for LED's.

In earlier posts, there was a mention of a "SandBox". The link went nowhere. Is there a "SandBox"?


I'm not aware of a "backpack" for 7 segment LED displays. But you can easily use a shift register to drive the displays. This will cost you 3 pins on the Netduino, but gains you a virtually limitless number of pins. You can either use 4 8 bit shift registers like the ever popular 74xx595, or two 16 bit shift registers like the 74xx676. They do have 32 bit shift registers, but I can only seem to find them in surface mount.

-dan

#3 Jstaple21

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Posted 25 June 2012 - 02:16 AM

I'm not aware of a "backpack" for 7 segment LED displays. But you can easily use a shift register to drive the displays. This will cost you 3 pins on the Netduino, but gains you a virtually limitless number of pins. You can either use 4 8 bit shift registers like the ever popular 74xx595, or two 16 bit shift registers like the 74xx676. They do have 32 bit shift registers, but I can only seem to find them in surface mount.

-dan

Thanks for the feedback. I found that Adafruit has backpacks that are specifically for the 4 digit 7 segment LED displays using 4 pins. The link is http://www.adafruit.com/products/881 . She has the same backpack with 4 colors.

The pinouts are ... I2C for the SCL, SDA and it also uses VCC and GND. There is some example code and libraries for the Arduino; but, conversion to C# is a job that I am not yet up to.

I guess unless someone can let me know how to use the Arduino code, I'll have to use the 16 bit shift registers.

Thanks again

#4 JoopC

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Posted 19 June 2013 - 08:27 PM

That's the big manco of Netduino, no program code available for most of the hardware. 

 

Now you'll have to convert from Arduino or PI code. or ask Stefan to make a small example.

 

You can find the Arduino library here:

https://github.com/a...ackpack-Library

 

You can find howTO here:

http://learn.adafrui...egment-backpack

 

You can ask on the Forum from AdaFruit here:

http://forums.adafru...segment#p203088

 

 

And for converting you can use this software to give yourself a push in the right direction from c++ to C#

Link : http://www.tangibles...esolutions.com/

 

When I was the owner of Netduino I contract a super software developer to convert as much as possible arduino code. 

That will pay back in factor 10.






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