for my current project (a remote antenna and bandpass filter switch) I need to drive at least 24 relays.
In my third prototype I use 2 4x4 driver shields.
But isn't there a cheaper way? Or should I go the resistor-transistor-diode route?
Relays are 12v (13.8v) and are at some 5m away from the Arduino which is continuously connected to my pc.
Any suggestions are welcome!