| 摘要 |
A piano keyboard play instrument is provided to give amusement to children or learners who are clumsy at the musical scale of keyboard instruments by predicting keys which the children or learners need to press in accordance with automatic playing LED lamps. A piano keyboard play instrument comprises a solar cell(1), a wind generator(2), an illuminating lamp(3), a power distributor(4), a music selection terminal(5), an LED keyboard(6), a musical footboard(7), and a speaker(8). A solar cell concentrates solar heat and charges a storage battery. The wind generator charges the storage battery by wind power of day and night. The electric energy from the solar cell and the wind generator is provided to the piano keyboard play instrument through a charging circuit device and a storage battery which are embedded in the power distributor. The illuminating lamp illuminates a surrounding of the piano keyboard play instrument for safe play of children.
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