When the resistors in this circuit are removed, the NodeMCU is working absolutley fine, however when these are put, ESP gets unstable and the relays are flickering. Also unable to flash with these resistors in place.

These are pull down resistors for external digitalRead as input. I need help to understand the issue better.

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  • \$\begingroup\$ what happens when you remove all those jumpers? are you sure the resistors are 10k? \$\endgroup\$ – Maple Jan 13 at 18:10
  • \$\begingroup\$ Does adding the resistors change the supply voltage? That would be a clue. \$\endgroup\$ – Elliot Alderson Jan 13 at 18:41
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    \$\begingroup\$ Which ESP8266 are you using? Your power supply outputs 5V, but you have it going into a 3.3V labeled terminal, are you sure that your ESP8266 can be powered by 5V? \$\endgroup\$ – Ron Beyer Jan 13 at 19:24
  • \$\begingroup\$ Perhaps a wiring error, incorrect components, or software fault. Please provide a photo of your setup and program listing. \$\endgroup\$ – Bruce Abbott Jan 13 at 20:44
  • \$\begingroup\$ Its Nodemcu, works on 5VDC, i am running tasmota.one of my observation is that when r3 and r5 are in place we are unable to flash Nodemcu. This pretty much means its a electrical circuit issue i guess. \$\endgroup\$ – Suresh Kumar Jan 14 at 1:22

VCC from HLK-PM01 is connected to PIN 1 of Node MCU which is expecting 3.3V and HLK-PM01 powers it with 5V. VCC from HLK should be connected to pin 30 (VIN) of node mcu. Thats very stupid of me... Thanks for the help guys, i will try to fix this up and retest again.

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