Most of us see the world in a very narrow band of the EM spectrum. Sure, there are people with a genetic quirk that extends the range a bit into the UV, but it’s a ROYGBIV world for most of u… ...

The UNO R4 Minima is priced at $20, while the UNO R4 WiFi is priced at $27.50. More information is at Arduino’s web site. Related Contents: Arduino partners with Renesas and Espressif for 3x ...