I have a relay module attached with esp-01 and it turns on/off at pin 2 state on/off The circuit works fine and does intended work but my esp-01 is pulled-up at pin-2 which causes the relay to turn on at circuit startup then off. I want to turn it off at startup and don't know if any additional component or such should be added to control this behaviour

 

You pulled up the transistor base through R1 to 5V.
If you want the relay to be off at beginning pull the transistor base down by connecting the R1 to Gnd.

Btw, don’t use capacitor across relay coil, it’s useless and causes slow relay contacts make/break.

 

if i don't apply 3V through R1 then my ESP does not power-up; and i know it causes relay to be on but it a requirement of the esp and i want to entertain both the relay and esp but don't know how; for intended relay off at startup

 

your GND does not seem to be connected anywhere

??? https://www.az-delivery.de/en/products/copy-of-220v-zu-5v-mini-netzteil ? followed by not so Low dropout AMS1117 ???

?? https://www.futurlec.com/Relays/JQC-21FF-05.shtml ?? **

 

The -Vo output of the AC-05-03 needs to be connected to ground.

 

It is missing in the diagram but yes it is connected to ground

 

I have updated my image do check the following

 

Your pin numbering for the AMS regulator doesn't match the datasheet!

 

Of course it will activate when you pull the base to V+.

 

Your pin numbering for the AMS regulator doesn't match the datasheet!

This AMS regulator has no other purpose than it converts 5V to 3.3V for ESP-01 nothing else and it's working fine

 

Of course it will activate when you pull the base to V+.

Actually I want to implement GPIO 2 output to base of transistor, but this GPIO 2 is high for boot of ESP and it cannot be changed, my problem is that despite this momentary high I don't want to effect base of transistor to be high at this point; what should I implement or do so that this boot-up high is discarded or not passed on to transistor but after that transistor is attached to GPIO 2

 

I dont know which model do you use of ESP8266 but I guess there should be other GPIO pins available, why search weird solution to pull the pin high just during boot then drop it low, when you can simply use another pin?

Or if it has to be GPIO 2, a solution might be PNP transistor?

 

Why is C1 across the relay?
Leave the + end where it is on +5V.
Move the - end to ground.
I think it should be across the 5V and not across the relay. When you turn on the relay it must be charged up through the transistor. This loads down the power supply for a short time.

 

I dont know which model do you use of ESP8266 but I guess there should be other GPIO pins available, why search weird solution to pull the pin high just during boot then drop it low, when you can simply use another pin?

Or if it has to be GPIO 2, a solution might be PNP transistor?

My ESP is ESP-01 Module; it has only two GPIOs and both are required to be high on boot
PNP transistor is not working I have tried it

 

Why is C1 across the relay?
Leave the + end where it is on +5V.
Move the - end to ground.
I think it should be across the 5V and not across the relay. When you turn on the relay it must be charged up through the transistor. This loads down the power supply for a short time.

Even if I remove C1 the circuit behaved the same. My problem is the connection between transistor base and ESP-01 Module
My ESP-01 requires momentary high at both GPIOs to boot and then goes to low, this momentary high causes flick in the relay

 

Use GPIO4 or GPIO5.
Disable internal weak pullup or pulldown in ESP8266.
Change R1 to 10k and connect to ground.
Remove capacitor C1.

 

Use GPIO4 or GPIO5.
Disable internal weak pullup or pulldown in ESP8266.
Change R1 to 10k and connect to ground.
Remove capacitor C1.

is this the changes you mentioned?
I have tried these but with this my esp does not boot and relay still flicks

also there are no GPIO 3 and GPIO 4 in ESP-01 module only TX RX pins and GPIO 0 and 2
I need TX RX as is to make internet connection and can only utilize GPIO 0 and 2 which needs to be momentary high for boot

 

mistakenly added

 

Why do you need TX and RX for internet connection? Why not use RXD aka GPIO3 as its a general purpose I/O at start up.

 

Why do you need TX and RX for internet connection? Why not use RXD aka GPIO3 as its a general purpose I/O at start up.

Basically it's a wifi switch I am using RX and TX to send relay status and receive relay status command