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I have connected my relay with a nodeMCU so that when I give commands to relay through nodeMCU the led connected to relay gets powered up. But after proper connection also it doesn't power up.

My setup

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    \$\begingroup\$ Where is your schematic? \$\endgroup\$ – winny Jul 11 '18 at 10:24
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You seem to be missing the other power connection

you've got the relay board GND connection hooked up, but it need a VCC connection too.

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  • \$\begingroup\$ I powered the relay using a breadboard power supply module (a black wire connected from breadboard power supply to vcc point in relay board) \$\endgroup\$ – Rohan Biswal Jul 11 '18 at 10:26
  • \$\begingroup\$ Oh, I thought that was a shadow! \$\endgroup\$ – Jasen Jul 11 '18 at 10:29
  • \$\begingroup\$ but there's no circuit to the breadboard power supply, connect the ground to that supply also. \$\endgroup\$ – Jasen Jul 11 '18 at 10:30

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