I made a circuit with some components (arduino, wifi board, ultrasonic sensor, sound sensor, light sensor, temperature sensor, humidity sensor, some leds and other components) on a breadboard.
The whole circuit is 5V. The whole circuit drains about 100mA during normal operations and up to 350mA during wifi communication.
Now I'm designing the final PCB.
My question is, which is better?
1) 5V 1A power supply (like smartphones charger)
2) 9V 1A power supply and a voltage regulator on pcb to get 5V (i was thinkg LM317T)
EDIT: i'm asking this question because with my 5V 1A power supply i actually measure about 4.4V when the circuit is ON (probably due to voltage drops in the breadboard) and I don't know if this could damage the circuit (arduino and wifi board). I think that with a voltage regulator i will have a clean 5V, but this requires me to buy a 9V adapter and add the LM317, that could add some heat to the circuit.
I don't care much about cost, size and power loss, but i really need reliability