On some of the smaller Arduino’s, like Arduino Nano, the RESET pin is labeled RST. Connect the RESET pin on the Arduino, to the GND pin on the Arduino. There is one more simple connection you need to make. Using the module with the wrong voltage could permanently damage your module! Isolating the processor from the IO-pins If it does work on 3,3 V, connect the module to the 3,3 V pin on the Arduino. *Make sure you know what voltage your module works at, some modules works on 3,3 V for instance. Connections between the Uno and the serial module Arduino Uno pins
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