51 SCM Laser Harp Electronic Organ Piano The music Box Puzzle

Feature: High bass swit Play the stored two songs by pressing the button When cutting the string corresponding to the LED string lit,a total of 7 LED A total of seven strings,the string when the buzzer cut the corresponding sound level Specifications: Power supply:5V The laser harp is a harp without strings, and instead of a bright beam of light, the user can just pluck the beam and play a melody. The photosensitive resistor and the single ip microcomputer STC89C52 are composed of two parts. The laun of the beam laser tube is blocked, the corresponding photosensitive resistance induction and generate resistance anges, eight photosensitive resistance of the ange of the system to produce high and low voltage, and low potential anges by microcontroller reads the photosensitive resistance, complete instructions input, single ip microcomputer control data according to the instruction information through the serial port to transmit data, both docking speaker p0 ^ 2 mouth and running water light p1 mouth to carry on the assignment, make its produce the corresponding reaction. When there is a laser beam, the microcomputer reads the voltage of the photosensitive resistor, whi is low level. When there is no laser irradiation, the microcomputer reads the voltage of the photosensitive resistor, then it is high level. Thus, when shielding the laser light, can produce the effect of the swit in the circuit. The audible frequency of the human ear is 20Hz to 20kHz, and the frequency of harp notes should be in this range. It #39;s just that different notes have their own fixed frequencies. The audio can be generated by the 16-bit timer that comes with the 52 single ip. For example, the standard pronunciation of the harp is 440Hz. By calculation, its half period is 1136 mu s. In this case, the se wave of 440Hz can be generated as long as the jump pin level in the half cycle. After the electroacoustic conversion component speaker, you can produce the standard sound la,