My project is to be able to toggle an LED using a GUI written in java over bluetooth, by using a HC-05 module. I am using pin 2 to control the LED. I have wired a voltage divider between the Arduino and the HC-05 as the HC-05 cannot take the full 5V. However, the LED doesn't go on when I click the …

[SOLVED] Help with using Java GUI to control LED using bluetooth HC-05 module

rzprojects July 9, 2025, 12:56pm 6

I am also a bit curious, but is there a reason why it would work for just the USB if it isn't a current limiting resistor?

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