Linear-cylinder-array-type voltmeter for the visually impaired

在视障学校，科学课使用两种类型的电压表。第一种是音频发音类型。第二个是模拟型的，有一个暴露的指示针。它们非常昂贵。此外，这些仪表已停产。在本研究中，我们研制了一种线性圆柱阵列式电压表，它由一个单片机和一个单片机组成。圆柱体与测量的电压成比例地向上突出。

In the school for the visually impaired, two types of voltmeters are used for science lessons. The first is of an audio pronunciation type. The second one is of an analog type, having an exposed indicator needle. They were very expensive. In addition these meters have been discontinued. In this study, we developed a linear-cylinder-array-type voltmeter, which consists of a servomotor and a microcontroller. The cylinders project upward in proportion to the measured voltage.