LASER HARP Circuit with STC-89C52 DIY KIT 

Inspired by the famous LASER HARP this is for everyone!
► Buy Laser Harp: circuitpop.com/products/c51-l...
A Laser Harp is a harp without strings. It is replaced by a bright light beam. The user only needs to turn the light beam as if the strings were turned, and they can still play a melody. Photoresistor and IC STC89C52 are composed of two parts. When the beam emitted by the laser tube is blocked, the corresponding photoresistor senses and produces a change in resistance. The system of seven photoresistors produces a change in high and low potentials, and the IC reads the changes in high and low potentials of the photoresistor to complete the input of the operation command.
When there is laser irradiation, the STC reads the voltage of the photoresistor, at this time it is low level. When there is no laser irradiation, the STC reads the voltage of the photoresistor, then it is high level. In this way, when the light of the laser is blocked, a switching effect can be generated in the circuit.
The frequency of sound that can be heard by the human ear is 20Hz to 20kHz, and the frequency of harp notes should also be in this range. It's just that different notes have their own fixed frequency.
Features:
- Auto Play
- Laser Light
- Power at 5V DC
- 21 Notes (7 gropup of 3)
- Switch for High, Medium and Low sounds
Components:
- 1x STC89C52 IC
- 1x 40 Pin DIP
- 7x Laser Diode
- 7x Photoresistor
- 10x 1KΩ Resistors
- 9x 10KΩ Resistors
- 1x 12.000 MHz Quartz
- 2x 30 pF Ceramic Capacitors
- 1x 10uF Electrolytic Capacitor
- 2x Buttons
- 1x DC connector
- 1x Transistor S8550
- Heat shrink tubing
- 3x Green LED 3mm
- 7x Red LED 3mm
- 1x Buzzer
- 1x Main PCB
- 3x PCB for structure
- 4x PIN (for USB)
- USB to DC cable
- Extra components are included with the KIT, like Resistors, LED and Pins.. I think they have been put as spare parts, I'm not sure.. they are still useful for other projects :)
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Chapters:
0:00 - Intro
0:49 - Unboxing
1:22 - Explanation
1:57 - Assembly
6:40 - TEST
9:07 - End
⚠WARNING Laser: Always use the necessary protections with LASER!!!
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WARNING: This video is only for demonstration. I don't take any responsibility.
#LASER #HARP #TUTORIAL

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