DIY Kit C51 MCU Laser Harp Kit String Electronic Keyboard Kit Parts for Study

Description: DIY Kit C51 MCU Laser Harp Kit String Electronic Keyboard Kit Parts for Study DescriptionNOTE ： it is diy kit , need you Welding by yourself Laser harp’s strings is replaced by laser beam. You can play the laser beam as a string. Each beam has a different pitch. It's very creative for you to DIY. 2. Principle of laser harp: The user only needs to move the beam as if the string is moved, and a melody can be played. The laser harp is composed of two parts: a photosensitive resistor and a single chip microcomputer STC89C52. When the beam emitted by a laser tube is blocked, the corresponding photosensitive resistance is induced and the resistance changes are generated. The system of eight photosensitive resistors produces the change of high and low potential, and reads the high and low potential changes of the photosensitive resistance by the single chip computer, and completes the input of the operation instruction. The MCU controls data based on command information to transmit data through serial port, which is assigned to p0^2 port of loudspeaker and P1 port of water lamp to generate corresponding response. When the laser is irradiated, the MCU reads the voltage of the photosensitive resistance, and it is low level at this time. When there is no laser irradiation, the MCU reads the voltage of the photosensitive resistance, then it is high level. In this way, when the light of the laser is shielded, the effect of the switch can be produced in the circuit. The sound frequency of the human ear can be heard from 20Hz to 20kHz, and the frequency of the harp notes should also be in this range. It's just that different notes have their own fixed frequency. The above audio can be generated by a 16 bit timer with a 52 single chip microcomputer. For example, the standard sound of the harp is La 440Hz. It can be seen from the calculation that the half cycle of it is 1136 Mu s. In this way, the square wave of 440Hz can be generated as long as the pin level is jumped in the half cycle. After the electrical conversion element (horn), the standard sound La can be produced, and the other notes are also produced. 3. Features： 1>.There are a total of 7 strings. When the string is cut, the buzzer sends out the corresponding sound level. 2>. When the string is cut, the LED of the string is lit up. There are a total of 7 LED. 3>. Play two pieces of music stored by buttons. 4>. Switch middle and high bass.Supply voltage: 4.5V-5.5V DC Package Included: 1 x DIY Kit C51 MCU Laser Harp Kit String Electronic Keyboard Kit Parts for Study Payment1.We accept PayPal only. 2.All major credit cards are accepted through secure payment processor PayPal. 3.Payment must be received within 7 business days of auction closing. 4.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.Shipping1.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay. 2.Items will be shipped within 1-3 business day when we received payment. 3.Delivery time depends on destination and other factors; 4.International buyers please note: a.Import duties, taxes and charges are not included in the item price or shipping charges. These charges are buyer’s responsibility. We will try our best to reduce the risk of the custom duties. b.Please check with your country's customs office to determine what these additional costs will be prior to buying. Returns policy1.If the item is not as described or damaged in transportation, please send it back within 7 days upon date of receipt2.For defective item, we guarantee free exchange or full refund within 30 days from the day of placing order3.Buyers pay shipping fees at their own cost to return products for exchange or refund. We will be responsible for the postage of replacements4.Items must be unused, in original packaging and include all parts, accessories and packaging5.When we receive your returned item, we will investigate the situation and consider to offer replacement or refund according to the situation Terms of sales1. All the items will be tested before shipping. Buy them with the confidence! 2. We maintain hightest buyer ratings StarStarStarStarStar and 100% customer satisfaction, Positive Feedback will be much appreciated from you.3. Any dissatisfaction or problem, please contact us before you leave neutral Neutral feedback rating or negative Negative feedback rating feedback. Feedback1.When you received package and like it, kindly comfirm received order and leave a positive feedback with full stars for us. Thank you.2.Any dissatisfaction or problem, please contact us before you leave neutral Neutral feedback rating or negative Negative feedback rating feedback.

Price: 13.82 USD

Location: 深圳市

End Time: 2024-08-24T12:42:28.000Z

Shipping Cost: 9 USD