Compact, inexpensive, and powerful! The Seeed XIAO family includes seven stamp-sized breakout boards with ESP32 controllers as well as with the RP2040, the SAMD21 and others. However, for connectivity in the prototyping phase, some extension board is needed. The Elektor eXpansion board integrates a lot of connectors (not just from the Seeed ecosystem), as well as a user button and LED plus some protection features.