Design of Coin Denomination Recognition System Based on Photoelectric Switch

The existing coin denomination recognition system has the shortcomings of complex structure and high cost.Therefore,according to the different sizes of domestic coins in circulation,a system with four photoelectric switches has been designed.When recognizing coins of different sizes,the values of different coins can be known from the output level of the four photoelectric switches.This system takes MCS-51 microcontroller to read output levels of the four photoelectric switches,classify and count coins and control PM66 pronunciation chip.Experiment shows that the desired goals can be achieved with this system.The coin denomination recognition ratio is up to 100%,thus this system has a certain application prospect and promotional value.