My NodeMCU V3 got overheated and died. Please help me figure out what i did wrong.

Brief Desrip: Project is an RC Car on ESPNOW Protocol. Transmitter setup have an Arduino Nano to take values from Two analogue joysticks and sends to a NodeMCU through Tx & Rx Pins, which then Transmits the values to the NodeMCU V3 in my Receiver (An RC CAR) over ESPNOW Protocol. Transmitter side is working perfect.

But, the NodeMCU V3 in my Receiver setup has got overheated and Died during a full throttled action. Here I am attaching the wiring diagram of the receiver setup. Please help me figure out whether there is any issues with the wiring.


  • Which part died? The NodeMcu or the motor driver?
    – PMF
    Commented Jul 28, 2023 at 7:33
  • the wiring diagram is not enough ... please provide info about the motor driver module ... it is unclear how the motor driver is getting 5 V ... looks like the motor driver and the servo are pulling power from GPIO D3
    – jsotola
    Commented Jul 28, 2023 at 7:43
  • Based on lastminuteengineers.com/… I'd have (a) ensured that the jumper for the 5v regulator was in place and (b) powered the NodeMCU VIN through the +5v of the motor driver board instead of the 7.4 volts from the battery pack. Have you removed the ENB/+5V jumper ? What part got hot ? The regulator or the ESP8266 module or what ? Did you simultaneously connect a USB cable to the NodeMCU ?
    – 6v6gt
    Commented Jul 28, 2023 at 9:44
  • 1
    Hint: A Power Supply the Arduino is Not!
    – Gil
    Commented Jul 28, 2023 at 15:19
  • @jsotola Motor Driver module is L298N. and D3 is the ENA pin for Speed regulation. Commented Jul 30, 2023 at 6:58

1 Answer 1


Based on https://lastminuteengineers.com/l298n-dc-stepper-driver-arduino-tutorial/, you have wired your servo incorrectly. The third pin on the bottom blue connector (VSS) is the second input, not the output.

Power wiring diagram of the L298N

I can only speculate what happened, but I suspect that the servo tried to draw power from the D4 pin which overloaded and fried some internal circuitry of the ESP8266.

  • The Arduino Cookbook is a good reference to have. First skim it then zero in on sections that are pertinent to your project.
    – Gil
    Commented Aug 5, 2023 at 3:18

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