7 Segment Display Göstergeli Hız Hesaplama Devresi

Hesaplama devresi 16f84 üzerine kurulu yazılım assembly ile hazırlanmış hız ölçümünde sensör olarak ldr kullanılmış sensörler aralarasından nesnenin geçişinde ki gecikmeyi hesaplayarak display üzerine anlık hız olarak yazıyor asm kod ve protel ile hazırlanmış baskı devre dosyaları bulunmakta

Devre şeması ve pcb çizimi

Ampho Meter

This project is used to measure the speed of a passing vehicle. Usually, this is accomplished by having two rubber strips across the road which operate mechanical switches when driven over.

The time it takes for the two switches to operate is used to determine the vehicles speed. A slightly different approach is used here. Two Light Dependant Resistors (LDR’s) are used for the sensors. As the vehicle passes over the top of these devices, the circuit detects the change in light level. A PIC 16F84 then calculates the speed from the time difference.

The circuit is quite simple. Two comparators are used to sense the change in voltage that is produced when the light level changes on the LDR’s. Two potentiometers are used to adjust the light level threshold that will change the output state of the comparators. When the outputs change, the PIC detects this and calculates the speed as determined by the time it took for the changes to occur. The result is shown on a two digit multiplexed display. The result is also stored into EEPROM for later use if need be.

pic16f84-hiz-hesaplama-ampho-meter