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there are several options for the displays (size of the display grid, size of the disks, colors, controller configuration, etc) the one shown here is a 7 x 28 grid of 15mm black / white disks. we emailed alfazeta at firstname.lastname@example.org, worked out what we wanted, and then paid them thru paypal. the displays are somewhat fragile but were vary carefully packaged and arrived with no problems.
yes the raspi 3 has builtin wifi so it makes it easy to connect the flipdot display to feeds from the interwebs ;)
howto flipdot with a raspiView Instructable »