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Click on the right arrow button (upload button) as shown in the figure to upload the program to the module. This will start the blinking LED on the onboard LED of the NODEMCU module connected to pin ...

OpenPLC is an open-source, free-to-use Programmable Logic Controller Suite, compliant with the IEC 61131-3 standard, and working with a range of hardware platforms such as Arduino, ESP8266/ESP32, ...