NodeMcu ESp8266 with Grove and Relay extension. Board with 2 Grove connectors for working with different digital GROVE sensors, Relay and 3 LEDS. Board have 5V standard power jack and terminal for connecting 5V in different way. Relay is rated for 10A 250V AC
I needed to setup my plant pump controller. It works with this board now
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Experienced embedded engineer with expertise in many hardware / software disciplines. Can turn your idea in prototype. Arduino, raspberry, beaglebone, whatever you think of.