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7400 competition entry: SPI LCD backpack

Posted on Friday, October 14th, 2011 in 7400 contest by DP

Stephen added his entry in the Open 7400 Logic competition, he made a LCD backpack that uses the SPI interface. Using two 74LS595 serial to parallel shift registers connected in series, he successfully sends data to the 16×2 LCD and adjusts the backlight brightness, by sending 2 bytes over the SPI.

The first byte to be sent is displayed on the LCD, and bits 1:3 of the second byte are used to adjust the backlight brightness with 32 levels available. The LSB of the second byte is the RS pin of the LCD.

Via the forum.

This entry was posted on Friday, October 14th, 2011 at 6:00 pm and is filed under 7400 contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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