The proposed 28pin DIL module includes a surface-mount ATmega328, plus an Espressif ESP8285 for the Wi-Fi interface, a Wi-Fi antenna and 2Mbyte of flash memory. An integrated push button and ...

The existing antenna was connected to the TEA5767 module. The radio module outputs stereo audio, but [Marcus] was content with using just a mono channel, as it would be used in his workshop.

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. USB connector changed to Type-C. 6 – ...