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Learn-Arduino-Simulator-By-Sir-Raheel Wokwi Arduino simulator is a browser-based simulator where you will build your projects. You can find several Arduino boards such as Arduino UNO, Arduino Mega, ...
Pull down the push button via a 10k resistor, if you don't set the pull-up mode on the input pin. If you have a Shelly in your wall and want to try out the MQTT connection without purchasing or wiring ...