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Open Blynk_SoftwareSerialTest sketch file in Arduino IDE. Replace with your Auth Token in the Blynk App on line 34. You should get Auth Token in the Blynk App. Go to the Project Settings (nut icon).

Even with more and more devices making the leap to USB-C, the Arduino Uno still proudly sports a comparatively ancient Type-B port. It wouldn’t be a stretch to say that many Hackaday readers … ...

Assemble the components on the PCB as per the circuit diagram. Fig. 4: Actual-size PCB layout of home automation system Fig. 5: Components layout for the PCB Download PCB and Component Layout PDFs: ...