Microcontroller-Based LCD Digital Clock with Temperature Display System

In the research work, temperature (°C and °F) and time (hour,minute and second) display systems are designed and developed. PIC 16F877A microcontroller is used as the control device. LM35DZ alalogue temperature sensor whose output voltage is linearly proportional to the Celsius temperature is used in this work. The PIC 16F877A is one of Microchip midrange 8-bit microcontroller that has a build in 10-bit resolution of Analog to Digital Converter (ADC) peripheral. The ADC converts the analog output voltages from LM35DZ temperature sensor to the digital values. Time (hour, minute and second) are displayed in the first line and temperature values are displayed in the second line of 2 × 16 LCD module. Two push buttons are used to set minutes and hours. The program in this project is based on the timer interrupt. The time is advanced by 1 second and the minutes and hours are adjusted if necessary and the hours, minutes and seconds are displayed every second on the LCD. Temperature value that can be displayed ranges from the minimum value of 0°C to the maximum value of 100°C. This process is repeated after one-second delay. The program source code is written with Pic Basic Programming Language