Revision [5249]
This is an old revision of YunhanRelayESP8366 made by ZorrUno on 2020-02-28 00:21:02.
Yunshan ESP8266 250V 10A AC/DC WIFI Network Relay Module
Original item. Approx NZ$6 with free shipping at the time (end 2019)
https://www.aliexpress.com/item/32967365594.html
This board was a bit fickle to get flashed and up and running with Tasmota, here are some notes.
I could not get the original http based controls working. I didn't want it, but I understood there was some basic control to begin with and it would have been interesting to see.
From a quick search, it was supposed to set up a wifi AP at
ssid: yunshan_wifi_xx_xx_xx (where xx part is suffix of MAC address)
or possibly
ssid:
Usef page with setup info:
https://ucexperiment.wordpress.com/2016/12/18/yunshan-esp8266-250v-15a-acdc-network-wifi-relay-module/
Relay (only) datasheet
https://www.robotshop.com/media/files/PDF/datasheet-v1.0-dfr0017.pdf
More links
https://www.reddit.com/r/esp8266/comments/58nnb0/any_documentation_or_instructions_for_this_board/