Eight-channel relay modules were among the electronics I bought for control projects.
The featured Amazon option is SainSmart Eight-Channel Relay Module.
Where it fits my build
I brought the roof light wires and camera cables into a PVC conduit layout. That work included drilled enclosures, threaded fittings, cable glands, solder-seal splices and grouped wiring.
During the small-box stage, I drilled for a male PVC fitting and used a fitting inside as a retaining nut. I routed the camera cable through a gland into a tee and brought the light-wire groups toward the van entry.
The larger roof enclosure during my cable-entry work.A grouped roof-wire connection before the final conduit work.
My build notes
The wiring project was a sequence of individual connections and routes. The photographs show the intermediate stages, including open boxes and wrapped wire groups, before the remaining covers and conduit joints were finished.
I built the cable route a section at a time, bringing local connections into the larger conduit system.
Alternative products
Two alternatives to compare
The SainSmart board groups eight switching channels. The single-channel board and automotive relay kit use different control and packaging arrangements for individual circuits.
Single-Channel Relay Modules
These relay boards switch a circuit in response to an electronic control signal. Their screw terminals and control pins provide connection points for a small control project.
