74HCT595 – The Longhorn Engineer https://longhornengineer.com Robotics, Pinball, Hacking, Portables Tue, 20 Dec 2022 20:20:48 +0000 en-US hourly 1 LM3S1968: 74HCT595 Shift Registers https://longhornengineer.com/2011/11/08/lm3s1968-74hct595-shift-registers/ Tue, 08 Nov 2011 11:10:37 +0000 https://longhornengineer.com/?p=725 Continue reading LM3S1968: 74HCT595 Shift Registers →]]> For one of my up coming Labs for EE445L I am going to need to expand the I/O of the LM3S1968. I am using the 74HCT595 much like on my pinball machine. One 74HCT595 allows you to turn 3 output pins into 8 output pins. They can be daisy chained so you can have any multiple of 8 output pins for those 3 original output pins.

In this demo I have 3 74HCT595 chips wired up. Instead of using the SSIO ports on the LM3S1968 I bit banged the port. SSIO is built in hardware that does serial communication. I decided to not use is for the 74HCT595’s because I am going to use it in controlling a DAC.

http://www.youtube.com/watch?v=_bkljz3YN60

The code is fairly module and easy to change to different ports and pins.

Link to the code.

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