ESP8266 Community Forum

The circuit above will work if the relay is solid state with a logic input.
If you're looking to drive a conventional relay, you will probably need to use a transistor. This page http://www.winpicprog.co.uk/pic_tutorial_extras.htm has a number of circuits that are useful in connecting various devices to a chip.

Pete

I've been testing this relay board.
http://www.banggood.com/5Pcs-5V-1-Channel-HL-Trigger-Optocoupler-Relay-Module-For-Arduino-p-945176.html
It seems to work well being driven directly from the GPIO pins of the NodeMCU. I can't say for certain that I'd endorse it but I haven't found any issues yet.

I am using one of these :
http://www.aliexpress.com/item/10pcs-lot-1-Channel-5V-Relay-Module-Low-level-for-SCM-Household-Appliance-Control-FREE-SHIPPING/2025821177.html
fed from 3.3v and connected directly to an ESP-07. Not sure how good it is for the relay but I have not had any issues so far

I quickly draw scheme with kicad for this module ... components are wrong but you can get pretty good idea...
I would like to drive both relays with one esp8266 pin. Thanks for any suggestions.