This flip-dot show acts like an Etch A Sketch
December twenty fourth, 2022—
Yearly, a number of of the most important names within the maker world on YouTube get collectively for a global Secret Santa change. Every take part will get to determine on a present for the assigned recipient and the one rule is that they need to make the reward themselves. Sam Battle, of the LOOK MUM NO COMPUTER YouTube channel, crafted this superior flip-dot show Etch A Sketch for Ruth and Shawn of KidsInventStuff.
Flip-dot shows was once frequent for bus-mounted route readouts and ETAs in airport terminals, as they’re reconfigurable and really readable at a distance. However the low price and ubiquity of huge LCD, OLED, and plasma screens made them out of date over the past couple of a long time. Few firms nonetheless producer them and so Battle had to make use of a classic flip-dot show panel. It really works utilizing a matrix circuit, like an LED panel. By making use of present, one can flip the state of a complete row, complete column, or a single pixel based on polarity and it’ll stay on the set state.
The identical works with potential distinction, which is how Battle selected to regulate his panel. As a substitute of reversing polarity, he can apply both floor or 10V (relative to 5V) to flip the state. An Arduino Nano controls the state adjustments by the panel’s built-in multiplexer chips. Battle then related a couple of momentary toggle switches to the Arduino that permit the person “draw” like they might on an Etch A Sketch toy. They will clear all the panel, transfer the “cursor” whereas setting pixels to yellow, or transfer the cursor whereas setting pixels to black.
Battle packaged the panel and management switches in a easy picket body with a Plexiglass cowl. It’s a really distinctive reward and one of the vital inventive makes use of for a flip-dot show that we’ve come throughout.