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Szymon

Member Since 04 Aug 2010
Offline Last Active Jul 14 2011 01:08 PM

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Poland, Krakow

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In Topic: HD44780 LCD + 74HC595 shift register wiring diagram

10 June 2011 - 06:09 AM

I am starting to suspect that the mystery resistor might be the fix. I am going to send Szymon an email and ask what he used the resistor for (I will also ask what size) I'll let you know what he says.

It's a current limiting resistor for the LCD backlight LED. I used 220Ohm but this might vary depending on what LCD you use.

In Topic: HD44780 LCD + 74HC595 shift register wiring diagram

24 May 2011 - 09:49 PM

OK, I finally got this working. As usual it was stupidity on my part. When I reversed the wiring between the shift register & the lcd I missed Qa (pin 15 on the 74HC595). If anyone is interested I have attached an updated wiring diagram (I am new to fritzing so please forgive the quality). Thanks everyone for your help. --Jim

Great news that it works for you and nice work on documenting the diagram!

Thanks,
-Szymon

In Topic: Using Netduino to Control Serial LED Display

24 May 2011 - 09:42 PM

Ah so that's you! We should chat some day I made my own LCD Transfer Provider based on your class as concept at the moment. I did this so it can use multiple 74HC595 IC's with the same latch pin. With my provider it's also possible to link multiple LCD's to the same SPI-pins as well If you like, I can send you my code, so you can take a look at it?

That would be great extension! If you'd like to join the project just send me your login at CodePlex.

Thanks!
-Szymon

In Topic: Using Netduino to Control Serial LED Display

24 May 2011 - 08:58 AM

Hi Rob, I wrote a library that simplifies connecting with various types of LCDs. You can read about it on my blog http://geekswithblog...id_crystal.aspx The library is hosted on CodePlex: http://microliquidcr...l.codeplex.com/