hell guys, i just want to ask how much volts and amps need to power up arduino? and devices connected to arduino like relay, coin hopper and lcd?
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5V and <50mA.
That's assuming you are using an Uno R3 or similar. There are many types/models of Arduino and they have different requirements.
As for your other components, the current and voltage they will require is the same as the length of a piece of string.
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You are putting the cart before the horse here and asking a question that really can't be answered. Every board and every sensor will have its own voltage and current ratings. Ideally you want to select components that all work at the same voltage and then add an appropriate external power supply if the sum of all sensors requires more current than the controller can source.
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