StandBy - ArduinoUno

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ciao!, possiedo un arduino uno r3 e sto sviluppando un'allarme, le schede e sensori che ho collegato ad esso sono:

- 1 sensore umidità;
- 1 buzzer;
- 1 lcd(20x4) con schedina i2c per moderare il numero di pin;
- 1 rfidrc-522;
- 1 ethernetshield;
- 1 laser;
- 1 fotocellula;
- 3 tasti;
- 1 relè;

visto il numero di componenti e soprattutto visto il tempo che scorrerà arduino acceso(di solito tutta la notte)...non vorrei pensare dopo quanto la batteria(9v) si scarica :o ...ci sarebbe un modo per ridurre il consumo ma nello stesso tempo fare alcuni controlli indispensabili come controllare se il laser punta ancora sulla fotocellula?

non puoi utilizzare l'alimentatore di arduino uno?


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