Modifying Wemos Relay shield

Wemos Relay Shiled was connected to digital pin D1, that is also busy when using I2C connections. So you need to modify the shield. The pin in the shield is pulled to ground, so I do not recommend to use D3, D4 pins (however it will likely also work fine). ... https://www.youtube.com/watch?v=GykA_7QmoXE