A MICROCONTROLLER BASED DIGITAL THERMOMETER WITH TIMER (DIGITHERMO)

• Published in: International journal of computer science issues Vol. 10; no. 2; p. 229
• Main Authors: Abayomi-Alli, A, Etuk, E J, Ezomo, P I, Izilein, F A, Akingboye, A Y, Erameh, K B
• Format: Journal Article
• Language: English
• Published: Mahebourg International Journal of Computer Science Issues (IJCSI) 01.03.2013
• Subjects: Agricultural engineering; Clocks; Computer science; Devices; Digital; Liquid crystal displays; Microcontrollers; Thermometers; Timing devices
• ISSN: 1694-0814; 1694-0784

Using conventional thermometers for measuring temperature will require a separate instrument for measuring time such as stop clocks, ordinary watches, or digital timers. These thermometers are fragile; prone to measurement errors, contain hazardous material that can burn the skin eyes, and respiratory tract if spilled. A microcontroller based digital thermometer with timer (DigiThenno) was designed and constructed. The device employs the AT89C4051 CMOS microcontroller (MCU), interfaced with the CA3162 ADC and a 16 x 1 character LCD display. Temperature is measured with a precision IC linear temperature sensor (LM35D) and time is counted using the MCU's timer circuits. The circuit was assembled on a prototype board, tested, modified and finally assembled on a set of matrix boards, and cased in a portable, stylish plastic casing with the sensor attached to a 28.0 cm long probe. Results during testing showed that the device displays time count in seconds and temperature in degrees Celsius. The device can be used in the chemistry and engineering laboratories as well as in industrial, agricultural and in other applications requiring simultaneous temperature/time measurements.