DHT 11 temp. And hum. Sensor always 0 values
You haven't bought a DHT11 module but the Grove - Temperature&amp;Humidity Sensor (High-Accuracy &amp; Mini) / TH02 module.



Thus you should use the example code here or follow the guide at seedstudio wiki.

Datasheet of the sensor: https://www.silabs.com/documents/public/data-sheets/Si7005.pdf