If your board really is a Wemos D1 mini and from the image you posted, the RX pin on the board is being used with the load cell interface and will affect the serial. In the project code of the link you posted, use pin 2 (RX) and in your code, use pin 1 (TX) and 2 (RX), which will affect the serial. purerandom January 14, 2023, 9:20pm 11.
Easy: the voltage supply to the LEDs is independent from the supply voltage to the D1-Mini. The need to share a common ground is all. I have several different ESP8266 boards driving 12v strings. They have 12v power supplies, but each ESP has a 12v-5v regulator. In my case, they are all 7805 3-terminal devices.
Next, begin the Serial Monitor. The Wemos D1 mini runs at 115200 baud. Make sure you adjust this value because the default is 9600 baud. The next section configures the WiFi connection from the Wemos to your Internet Network. It’s written so that the device has 15 tries to connect or it will fail.
The WeMos D1 Mini is a popular development board based on the ESP8266 microcontroller. It is designed for Internet of Things (IoT) applications and projects,
It is just a switch toggle. There should be an example to turn a LED on/off in the Arduino IDE, it is the same thing. I believe the relay uses D1 as the switch.
Open your Arduino IDE and go to Sketch > Include Library > Manage Libraries. The Library Manager should open. Search for “ DHT ” on the Search box and install the DHT library from Adafruit. After installing the DHT library from Adafruit, type “ Adafruit Unified Sensor ” in the search box. Scroll all the way down to find the library and
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    • what is wemos d1 mini