DHT11 Temperature Module

Description:

Temperature and humidity measurements are a nice addition to many hobby projects. But [Rajendra Bhatt] makes the point that many of these sensors have a price tag that is well above what most hobbiests are willing to spend. He decided to take an in-depth look at the DHT11 sensor; which you can get your hands on for under $1.6 if you know where to look.

The four-pin device uses a 1-wire protocol. [Rajendra] discusses the ins and outs of the communicationsdemonstrating the part using a PIC 16F628. It’s a snap to connect to your projectrequiring VCCGNDand a pull-up resistor on the single data line. We’ve already seen it used on at least one projectand hope to see more of this little guy in your own hacks.

Features:

• Dimension 28mm*12mm*10mm
• Main chip DHT11 huminity sensor
• Voltage: DC 5V
• Digital output
• Humidity Range: 20—90%RH
• Humidity  accuracy: ±5%RH
• Temperature range: 0—60?
• Temperature accuracy: ±2?