BARE BOARDS ONLY, NOT ASSEMBLED. COMPONENTS NOT INCLUDED

So to flip a dot on a flipdot display, you have to pulse 12v across the coil under the dot for about 1ms. To flip it back, apply voltage with the opposite polarity... In a display like this, the coils are wired up in a multiplexed matrix, with a clever arrangement of diodes to prevent dots from flipping when they're not supposed to due to current 'backflowing' through coils besides the one at the desired row and column position.

In this particular display, circuitry for driving each of the 7 rows low or high is built into the display module. The drivers for each of the 25 columns were originally located on an external board. The custom controller board I designed contains the 25 column drivers, and controls the row drivers on the display PCB, so that each dot can be individually flipped yellow or black. Then it's just a matter of writing some code for either an Arduino Nano or ESP8266 to get the dots to display whatever you want. I'll post a link to the EasyEDA schematic of this board soon.

https://oshwlab.com/cselz/gulton-flip-dot-board