This D1 Mini Relay shield comes with a 10A / 250VAC print relay, and is compatible with the WEMOS D1 Mini environment.
The relay is activated through pin D1.
Tt requires the 5V power supply to work. If you power your D1 Mini only by 3.3V, or a single lithium cell, the relay module will not work.
Example codes for Wemos D1 Mini Sensors and Modules (GitHub)
Another source for Wemos D1 Mini compatible Arduino libraries (GitHub)
Duckylock –
Le relay fonctionne parfaitement bien. C’est quand même bruyant mais tous les relay font du bruit lors du changement d’etat
Brad Schroth –
I’ve only used two so far for a DYI smart boiler control to work with Home Assistant. After 2 months, no issues. Work as expected. Good quality.