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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Rene
@DrAzzy that could be the right hint. Thx.
Looking on the video I saw only a power connection between Pico an esp8266 via two wires ( Gnd and 5V ). The middle connector (labeled: VDD) leaves unconnected.
Do I have to connect that middle pin to the esp8266 too ?