Hi all. Back with another question. I need to trigger 2 remote relays with a single Arduino output. They require LOW trigger. They are far apart (wiring nightmare) and I only ran one wire (actually have 2 sets of these remote relays and 2 wires for each set). Made a test circuit to check. One relay triggers when output goes LOW, but drops out when I connect to 2nd relay.
My thought was to use transistor to provide necessary source current. If I use Stan's circuit above w/o IR sensors and just use Arduino HIGH to turn on transistor, and connect collector to 5VDC so trigger is held HIGH till Arduino goes LOW, will that work. I believe I need approx. 80mA to trigger both. Any better circuit would be much appreciated.
Ken
