I need to control 360 5V-relays with my Arduino (only one relay will be active at one time). From my search, 74HC595 seems to be the best candidate. I will need 45 units of 74HC595 since each 74HC595 can control 8 bits or 8 relays. Does anyone have a different approach that can help me reduce the number of 74HC595 required?
I came across a posting by Azi where he stated "I am using 8 shift registers per 3 pins, for totally controlling 225 relays". I have messaged him and am waiting for his reply. In the meantime, would anyone know how it is possible?