Features common to Arduino R4 – ‘WiFi’ (€25, below) and ‘Minima’ (€18, right) IO connections are in physically similar positions to Uno R3, and IO remains 5V.

Look out — there's a new iOS bug that can kill your iPhone or iPad's Wi-Fi functions if you connect to a hotspot with a very unusual name, or SSID. You won't be able to connect to another ...