As GPIO inputs, these should *not* draw 2 mA from whatever is driving them, let alone 200 mA. Why do you think the input current is so high?

Also, where are you located?

ak

 

Did you really mean 200 milli A, or should it be 200 micro A?

 

NODEMCU GPIO power up behavior = beware -

http://rabbithole.wwwdotorg.org/2017/03/28/esp8266-gpio.html


Regards, Dana.

 

Thank you guys for all the valuable information given.

Thank you AK for post #16 it is working perfectly.
I live in south India BTW.

For the current draw, it was my mistake.

Thank you Dana for #23 it was really helpful.

 

I need a simple circuit which will give a 100ms 5v pulse when an SPST switch is turned ON (i.e constant input) and a same 100ms 5v pulse when the SPST switch is turned OFF.Please help.View attachment 158175

Most simple solution:
use a PIC ( smallest one) interrupt on up and low going edge from input.
Generate a 100mS pulse on interrupt.
Use Pic timer_x to create pulse.

Want power output? add a p channel mosfet.

This a less than 1 hour job.

Picbuster

 

Depending on PIC you use be careful of GPIO power up glitching -

https://www.microchip.com/forums/m612543.aspx


Regards, Dana.

 

Thank you AK for post #16 it is working perfectly.

The post #16 was posted by crutschow.

 

The post #16 was posted by crutschow.

Sorry I was mistaken.
Thank you crutschow for the circuit.
Although everyone's inputs here were very helpful.
I have learned important things.

Thanks, guys.
keep rocking.

 

Here is a solution using Bascom AVR, their Basic language. IDE is free for

small projects like this.


https://www.mcselec.com/index.php?option=com_content&task=view&id=14&Itemid=103


Uses ATTINY85, 1 R (button pulldown), one button, one cap to bypass ATTINY85.


Code looks like –

Output is –

Top trace button press followed by release, time in between is arbitrary.

Bottom trace is output, 100 mS pulse, triggered by each edge, width your choosing. Accuracy is

quite good.


Regards, Dana.