The vending machine is how to identify COINS and paper money

The money is not involved and machinery, electrical, optical, magnetic, etc led domain knowledge, need to each side surface, mutual match was the move to sell goods, dynamic sales since the card machine each kind of self help service such as the key of the equipment. Key words: the hard currency is not the paper currency is not the recognizer principle 1 currency monetary is AT89C52 don't implement the main including hard currency is don't and the paper currency is two part. 1. 1 hard currency is not the original before me the haircut lines of 1 yuan, 5 horn and 1 hard currency of metal materials is designed for the coin door to make use of special alloy, because of this in it pass through the cast money into the into into the composed of electric and electric capacity set into a set of high frequency vibration swing line raw magnetic field from the road, king of material quality and product difference on electric quantity of big small and micro weak difference now, sense of electric quantity changes of the rate of the oscillation frequency of vibration. 。 。