Seven-segment LCD uses two-wire interface


Posted on Aug 18, 2012

You can connect seven-segment LCDs using only a two-wire interface (Figure 1). The two-wire interface may be at the field-effect, direct-drive LCD or at a serial interface (such as I2C) that uses an eight-pin microcontroller. The design in Figure 1 uses an Atmel (www.atmel.com) ATtiny12 microcontroller, IC1. VCC can range from 2.7 to 5.5V.



Each digit receives drive from an 8-bit 74HC164 shift register, which provides seven outputs for each of the segments and one output for a decimal point or a colon. The data input to the shift register drives the LCD`s common terminal. Software for t




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