Markus' Blog

Archive for January, 2011

DIY Split-flap display driving circuit

by on Jan.01, 2011, under Electronics

Split-flap display with clock
A while ago I got my hands on some old split-flap displays from a train station. Yesterday I finished driver circuits for 8 of the segments. It was only just in time to also quickly implement a clock algorithm for an extraordinary clock to display the turn of the year. Don’t miss the movie at the end of this posting.

Split-flap segments connected to driver boardsThe original driver circuits consisted of a Zilog processor, an EEPROM, an optocouppler for driving the 42V synchronous motor, transistors, two reflective IR-sensors for segment position and a few passive components. Since I do not have any information about the original interface and protocol, I decided to implement my own driver circuit and directly connect to the sensors and motor.

Split-flap digits switching

(continue reading…)

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