![]() ![]() Therefore, the first and third bytes of received data actually give the numeric values of the measured relative humidity (%) and temperature (☌). + Checksum Byteįor DHT11 sensor, the decimal bytes of temperature and humidity measurements are always zero. The 40-bit data from the sensor has the following structure.ĭata (40-bit) = Integer Byte of RH + Decimal Byte of RH + Integer Byte of Temp. The DHT11 sensor uses a proprietary 1-wire protocol which we will be exploring here and implementing with the PIC16F628A microcontroller that will receive the temperature and humidity values from the sensor and display them on a 16×2 character LCD. This articles discusses the DHT11 sensor which also provides calibrated digital outputs for temperature and humidity but is relatively lot cheaper than the Sensirion sensors. While SHT1x/SHT7x are very accurate sensors, they are still expensive for hobbyists use. These sensors are capable of measuring both temperature and relative humidity and provide fully calibrated digital outputs. We discussed in past about Humidity and temperature measurements with Sensirion’s SHT1x/SHT7x sensors. The use of such smart sensors greatly simplify the design and reduces the overall cost. These days devices are available which have both temperature and humidity sensors with signal conditioning, ADC, calibration and communication interface all built inside them. Measurement and control of temperature and relative humidity finds applications in numerous areas. ![]()
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