LED Sign

An Arduino gives this quirky old LED sign a new life as a smart display

Arduino Team — April 7th, 2026 Clem Mayer over at element14 Presents got his hands on a big old LED matrix display and when he turned it on, it worked perfectly. It even displayed the last programmed message, like an inadvertent time capsule. But upon opening up the enclosure, Mayer found danger and some strange control quirks. So, he used an Arduino UNO R4 WiFi to rebuild the LED sign, making it both safe and...