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A signal as low as 2v could works as an external clock. One idea: add a voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a diode matrix to select segments from each step. Could add a voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment display with LED backlight http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft43-ae.pdf TFT-graphic display 640x480 16 bit colour TFT-graphical display 800x480 16-bit colours with capacitive touch panel http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft70-ae.pdf TFT-graphical display 800x480.

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