INTRODUCTION
Embedded Linux Based GLCD application development project is used for interfacing the sensor data card with ARM9 processor based Single Board Computer and displays the records on Graphics LCD (GLCD) with read-through of upper and lower limit of incoming data through two encoders and indicating the same on GLCD.
Sensor data card consist of all together four sensors-Temperature, Pressure, Humidity, Distance respectively. Sensed parameters coming from Temperature, Pressure and Humidity sensors are analog data which is given to SBC9302 processor through ADC and Distance sensor data is serial data directly in centimeter which is given to processor through serial port. The precise data coming from all four sensors are displayed on 320 X 240 Graphics LCD in different graphical format. Before displaying data on GLCD all sensed parameters are first set to Upper and Lower Limit by two encoders. These two encoders set the upper and lower limit by two Knobs respectively. Output parameter fluctuate number of pulses which are directly dependant on the knob position. GLCD also shows indication of over and under measurement status after doing respective calculation.
