Research Article: GRAPHICAL INTERFACE FOR MEASURING AND RECORDING TEMPERATURE WITH THE DS18B20 DIGITAL OUTPUT SENSOR
Viorel Popa, Elena Popa · 2013
The article presents the authors’ two original graphical interfaces made in Borland Delphi and designed to measure and record (with the DS18B20 sensor) a wide range of negative and positive temperatures. The first interface allows the reading of a sensor’s unique code and then the measurement and recording of temperature. The second interface can work with a variable number of such sensors once their unique code has been entered. The interfaces have been conceived for the study of the slow variations of air temperature inside chambers or wood, in timber freezing, heating or drying processes. To achieve the purpose we have also experimented on other variants of temperature sensors, but finally we have adopted the variant that uses the DS18B20 digital output sensor manufactured by Dallas Company. This sensor has the following advantages: - a small size (it can be easily inserted into a 4 mm diameter hole made in the wood piece); - it measures temperatures between -55°C and +125°C; - it can relatively easily connect to the RS232 serial port of a computer; - with only two wires one can ensure data insertion and transmission from a number of 4 ÷ 10 sensors of this type.