For true isolation, you don’t connect the Photon’s Ground to the relay at all.
As per the picture, this requires a dedicated power supply for the relay.
You activate a relay by driving the Photon pin LOW.
This page was very helpful to me.
For true isolation, you don’t connect the Photon’s Ground to the relay at all.
As per the picture, this requires a dedicated power supply for the relay.
You activate a relay by driving the Photon pin LOW.
This page was very helpful to me.