Arduino Relay shield on a Wemos D1
I bought an Arduino Relay Shield to use on my Wemos D1 (ESP8266). After some poking around here is the mapping for which pins enable which relays:
To enable the relays on this shield you pull the appropriate pin HIGH. Other relay boards I've seen require you to pull the pin LOW, so don't get confused.
Here is the Tasmota template I used for the relay shield.