power - Using Vin pin on Arduino with a shield - Electrical Engineering Stack Exchange
Arduino Uno Tutorial [Pinout]
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Arduino Projects - Circuit Construction First make the circuit connection as shown in fig1.1. The 1st Pin(Vcc) of Bluetooth(HC05) is connect to +5v of Arduino Uno and 10th pin(GND) to Arduino Uno
Can you give 12.3 Volts on Vin pin of Uno? - Project Guidance - Arduino Forum
The Full Arduino Uno Pinout Guide [including diagram]