The three pumps have a flow rate of 60, 45, and 90 L/min, respectively. The capacity of the tank is 180 L. The system will be run in three modes (A, B, and C) according to the selector switch. The system is controlled by PIC16F877A with a 4 MHz oscillator.
PUMP1
MIXER
Fluid A
PUMP2
Fluid B
Batch Mix Simulator
Selector Switch
THERMOSTAT
PUMP3
HEATER
Figure Q.1 Batch Mix Simulator
Study the system carefully and answer the questions below:
1) What are the inputs and outputs of the system, and assign them to PIC16F877A I/O pins? (7 Marks)