Hellow all,
I have a parallel interface with the SPI port on my MEGA 1280. I have considered using a 74hc595 chip as an interface and to that end have explored various schemes. The problem is that none of them seem to work as I thought they should. Has anyone tried this and if so do you have a schematic that I can try?
Thanks in advance
Dillon
So, how did you hook up the shift register, how did you write to it, how did you expect it to work, and how is it actually working?
The playground has a schematic for the 595 (don't put the .1uF cap on the clock line as they show) that works AFIAK. (can't find a link for it though.)
I did find this.
http://bildr.org/2011/02/74hc595/
Rob
This isn't exactly what you are asking but might help:
I had a graphical LCD hooked up via both SPI and I2C (using an IO-expander chip). The circuit and code are on that page. If it is a graphical LCD you might be able to use it as is. A text-only one would need changes, but that would be a simplification of the existing code.