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  • what does this mean? I can only turn it on once Commented May 30, 2019 at 3:24
  • Have you used a multimeter to check if the contacts are switching? Commented May 30, 2019 at 4:00
  • 1
    it he relay expects 5 V as HIGH signal, that it is possible that it doesn't read 3.3 V as HIGH. the D1 shield is made for 3.3 V signal Commented May 30, 2019 at 9:45
  • a logic level converter would likely work in your situation (too low of a high voltage to trigger) Commented May 30, 2019 at 17:51
  • in my previous comment "it he" is "if the" Commented May 31, 2019 at 5:15