I'm trying to wire up the SRD-05VDC-SL-C mechanical relay to a Particle Photon and/or Arduino (not the version that is on a breadboard), and am a bit confused by the datasheet.
I device I am switching on/off is 12 VDC, and I understand NO vs NC..but am not so clear on Coil 1 vs Coil 2.
Basically I've hard-wired a 12 VDC source into Coil 1, while Coil 2 is being driven by a DO on the microcontroller through a transistor to bump up the current to the needed 70+ mA. Is that correct? What is common for..?