I want to control relay

I have a arduino uno and esp8266-01 module.
I want to control relay.Help me please.

Welcome to the Blynk forum.

Start with this documentation for connecting the ESP and UNO:


Other links to the Documents, Help Center and Sketch Examples are available at the upper right of this page.

Can i try it without using USB-UART TTL converter?

Yes but it’s difficult to debug any problems without Serial Monitor.
Wouldn’t recommend using an Uno and 01 to control a relay with Blynk.
Just use the ESP01 in standalone mode.

if i use esp01 in standalone mode,UNO can be a programmer?

Yes I believe it can be set up in place of a USB2TTL adapter.

you probably should buy something like this, it is much cleaner way to upload flash.