In need of a simple microcontroller board for your project? Then, an Arduino ... than the R3 at $27.50. One of the most significant differences between the classic Rev3 and Uno's more recent ...

“Uno R4 WiFi ... s LED matrix The on-board 12 x 8 (96pixel) matrix of red LEDs (photo right) is Charlieplexed for pixel-level addressing. Arduino_LED_Matrix API is available for programming and ...