Gnd kena common.. Ground PS short dgn ground Adruino. Betul dah tu..
Data Adruino >> Data in LED..
kalau ikut spec LED strip ni die tulis mcm ni
"Each RGB LED draws approximately 50 mA at 5 V with red, green, and blue at full brightness"
So boleh la darab bilangan LED, so dapat max current..
Tapi realitinya, die on off (PWM) so total current mungkin kurang dari calculation.. Cari Power Supply minimum 2A.. try dulu