Yeah. And that was the reason, why I did not understand the use of the diode over there.

Thanks for the information @Majenko. It was really helpful. I have a small confusion. The RESET pin is not a source of voltage or current, right? So how does the RESET pin become LOW as soon as the 555 is low with the diode conducting? I mean how does current flow from the RESET pin if its not a source of current?

Yeah sir. However, if i follow the connections as outlined in the blog, i think it must work right? But it doesnt work for me? Is there something that i am missing here?

I referred it long ago. And followed instructions from there only.

Yeah, i made the connection as you said sir. 5v to Vin and ground to GND.

Im sorry. Its V2. I did a google search and found that V2 was called second generation at this blog frightanic.com/iot/….

second generation.

I took a USB charger - 5v 1A and connected its positive to Vin of NodeMCU. I am not using any arduino here.

The 5v power supply is 1A. So with that too, the NodeMCU doesnt work. Am I missing something here? Please help me.

No. the NodeMCU works on USB power still. Its not dead.

@ChrisStratton I am not using an SD card, but using internal memory to store the file. I have changed the process, and this time I am not writing to the memory often. I might read/write to the file once a month or something like that. Hope the file has enough life cycle to handle so many writes.