Is the DHT11 an I2C device ?
i dont think so here is what i found
5. Communication Process: Serial Interface (Single-Wire Two-Way)
Single-bus data format is used for communication and synchronization between MCU and DHT11 sensor. One communication process is about 4ms.
Data consists of decimal and integral parts. A complete data transmission is 40bit, and the sensor sends higher data bit first.
Data format: 8bit integral RH data + 8bit decimal RH data + 8bit integral T data + 8bit decimal T data + 8bit check sum. If the data transmission is right, the check-sum should be the last 8bit of "8bit integral RH data + 8bit decimal RH data + 8bit integral T data + 8bit decimal T data".