Hardware Reference
In-Depth Information
Chapter 1
DHT11 Sensor
The DHT11 humidity and temperature sensor is an economical peripheral manufactured
humidity between 20 and 90% RH within the operating temperature range of 0 to 50°C,
with an accuracy of ±5% RH. Additionally, temperature is measured in the range of
0 to 50°C, with an accuracy of ±2°C. Both values are returned with 8-bit resolution.
Characteristics
The signaling used by the DHT sensor is similar to the 1-Wire protocol, but the response
times differ. Additionally, there is no device serial number support. These factors make
the device incompatible with the 1-Wire drivers within the Linux kernel. Figure
1-1
shows
a DHT11 sensor.
Figure 1-1.
DHT11 sensor
