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Expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many external clock signal, start/stop, manual step button in Unseen Servant - Could replace step IDs with a 7-segment display with LED backlight 160x104 RS-232 I2C or SPI LCD 4x10 character 3.3V VDD I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip160-7e.pdf LCD-graphical display with LED backlight 240x128 LCD display 320x340 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip160-7e.pdf LCD-graphical display with LED backlight 128x64 RS-232 I2C or SPI LCD 4x10 character 3.3V VDD I2C or SPI LCD graphical display LED backlight TFT graphical display.

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