This is one of the basic and easily implementable circuit for the basic knowledge and practice of an electrical engineer and engineering student using microcontroller 8051. Visitor counter can be used on numerous places where the data for the persons at a perticular place need to be kept such as banks, private places etc.
Here i have designed a basic circuit using 555 timers. And basic infrared reciever TSOP1736 are used as sensors for the detection of the persons entering and leaving. There are two sensors placed at some distance so that when a person enters the room, the sensor output cuts when the person passes in front of one of them. so when a person leaves, the order in which sensors give low pulse reverses.
555 is used in monostable operaton as can be seen from the diagram. In monostable operation, 555 gives output only when input trigger pulse goes down. This happens when a person passes in front of the sensor.
Both outputs from the sensors are fed to the microcontroller 8051. Microcontroller checks in which order the sensors are illuminated. And gives output to the 7 segments accroding to the programm. This one is very easy to practice and get some experience of microcontroller 8051 programming.
Here i have designed a basic circuit using 555 timers. And basic infrared reciever TSOP1736 are used as sensors for the detection of the persons entering and leaving. There are two sensors placed at some distance so that when a person enters the room, the sensor output cuts when the person passes in front of one of them. so when a person leaves, the order in which sensors give low pulse reverses.
555 is used in monostable operaton as can be seen from the diagram. In monostable operation, 555 gives output only when input trigger pulse goes down. This happens when a person passes in front of the sensor.
Both outputs from the sensors are fed to the microcontroller 8051. Microcontroller checks in which order the sensors are illuminated. And gives output to the 7 segments accroding to the programm. This one is very easy to practice and get some experience of microcontroller 8051 programming.
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