This project is based on Microcontroller PIC16F84. The system Direction Indicator gives the direction where the sensor/device points. Direction is indicated using a LCD display. To simulate this circuit, initially activate Mixed Mode simulator from the Schematic Editor window. Simulation can be performed by selecting Transient analysis from Simulation menu.
A variable resistor is used for sensing the change in direction. The analog voltage value from the potentiometer is given to an ADC. The ADC gives the digital input to the PIC. The ADC 0800 is used here to convert the analog voltage value from the potentiometer. The working of the ADC depends on the pulse received from PIC. PIC gives high/low voltage to the start of conversion pin of ADC when desired, and when an end of conversion is detected from the ADC it reads the output. The value received is compared and the corresponding direction is indicated in the LCD.
PIC16F84 have only 13 I/0 pins there fore buffers are used for multiplexing data and controls to LCD and ADC.