Hello everyone,
I ask your advice to power supply simultaneously Arduino UNO and 3 relay shield with 8 relais like this:
If I understand well, Arduino needs (as optimum) 7 V, the cards need 5V.
(I specify that I will use at most 5 relays simultaneously)
I thought I would use this:
http://www.ebay.it/itm/ALIMENTATORE-TRASFORMATORE-220V-12V-2A-STABILIZZATO-PER-STRISCE-A-LED-/271269965180?pt=IT_Stanza&hash=item3f28f32d7c
And then reduce the voltage to 7 V and to 5 V with two of these:
http://www.ebay.it/itm/MODULO-CONVERTITORE-LM2596S-REGOLABILE-DC-DC-STEP-DOWN-ALIMENTATORE-ARDUINO-/281364071011?pt=Altro_Elettronica_e_Elettricità&hash=item41829b0263
What do you think?
Thank You very much
Alexander