How do I use PIR motion sensor to trigger 3v relay module? Answered
Looking for help on my project. See image. Testing before connecting to high voltage device. This is my first attempt using a relay. Using a 3v relay triiggered by the PIR signal. As you see wired now, There is no ground wire coming from PIR only Red + and Yellow signal to relay.. The circuit would not trigger relay with a ground wire to the PIR. When this does trigger ( without the ground wire on PIR) I noticed on the relay that the LED would not go completely off. It dimmed showiing that the relay board was still receiving power. So I check to find that when relay turns/switches "off" the PIR is still sending 2.6-2.8 volts to the relay. Not enough to trigger the relay, but enough to show power through the LED. Obviously something wrong here where the PIR or Relay are still drawing power. Can you help?