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By using 8086 microprocessors, develop an assembly language program of a simple contactless digital tachometer. The assembly language developed should related to the design of contactless digital tachometer below. - The sensor circuit consists of an IR transmitter and an IR receiver. An IR LED is used as the transmitter and a photo diode is used as the receiver. A reflective type of IR sensor is used in this project. In this type, the IR transmitter and receiver are placed side -by - side. - The IR transmitter circuit is very simple. The anode of the IR transmitter is connected to 5V supply and the cathode is connected to ground through a current limiting resistor of 150. Thus, the IR transmitter starts emitting infrared rays. - IR receiver used in the project is a photo diode and it must be connected in reverse bias. The negative terminal or cathode is connected to 5V supply and the positive terminal or anode is connected to ground through a current limiting resistor of 10K. - And finally, the output of the IR receiver is given to the comparator. The comparator compares the input from the IR receiver with a reference value (which is given through a 10K Potentiometer). If the input from the IR receiver is greater than the reference value, the output of the comparator will be HIGH or else, the output will be LOW