ESP01 ESP01S ESP8266 2 channel relay board case
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Box / case for a ESP-01(S) / ESP8266 based 2 channel relay board
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Box for a 2 channel ESP-01(S) / ESP8266 based relay board such as
https://www.aliexpress.com/item/1005004533412591.html
http://www.chinalctech.com/xwzx/24.html
Requires the great https://github.com/mrWheel/YAPP_Box
Note that this relay board is a bit cumbersome to control using esphome or other, as it's using a serial interface from the ESP to a (micro)controller on the main board. There is no way to query the status of the relays and they don't reliably turn back on after power loss even with the "correct" esphome config.
See https://fadedlogic.com/guides/smarthome-lctech-5v-2ch-relay/ or https://community.home-assistant.io/t/using-an-esp8266-dual-relay-combo-board-with-home-assistant/218757/61 for some guidance.
I eventually turned away from those boards and moved to those ESP32 based ones with direct IO controlled relays which allow querying the state: https://devices.esphome.io/devices/ESP32-Relay-X2/
Another box for those will follow, even tough such ones already exist.