Now, Lets discuss what we are going to do in this chapter. We are going to connect a infra red led and sensor and interface it with the LM324 comparator IC. And wait, we are going to interface the data with our 8051 microcontroller and write a small program which would blink the led connected to the microcontroller. You can connect buzzer etc in the same way. But for now lets only connect an LED which would help you understand what to do with the digital data which will come from LM324 IC. So jump to the next chapter to gather your components for the the practical tutorial.
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