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PIR (PASSIVE INFRARED) DETECTOR USING ST7FLITE05/09/SUPERLITE

Figure 5. Main Routine Flowchart (Part 2 of 2)

Is Difference >

variation Limit

A

YES

NO

Convert the variable (which is to be checked at hyper terminal) into ASCII

and transmit the ASCII data through one port PA5 Pin at baud rate 4800

Find the difference between the previous stored value

(no of times biasing signal made low) and current value of low_var.

Is a new value of

Low_var received?

Yes

Yes

No

Find the difference between the current and maximum,

minimum values of low_var.

Is Difference >

variation Limits

Alarm or LED indication for desired duration (may

be permanent ON of Alarm/LED)

No

A

A

Decision Block

A