電梯投影儀，在使用過程中，需要判定電梯門的開和關(guān)。SK-Z-5激光測距傳感器可以有效解決這個問題。

根據(jù)CTR數(shù)據(jù)顯示，2017年第一季度-第三季度電梯電視（樓宇視頻）月度刊例收入同比增長19.8%。樓宇廣告實現(xiàn)價值回歸，增速超過互聯(lián)網(wǎng)營銷（互聯(lián)網(wǎng)廣告增長率9.8%），成為推動行業(yè)增長的主要動力之一。

由此可見，電梯視頻廣告正在悄悄地獲得消費者注意力。

   According to CTR data, monthly revenue from elevator television(building video) in the first quarter of 2017 to the third quarter increased by 19.8 % year-on-year. The return of value to building advertising has outpaced Internet marketing(9.8 per cent growth rate of Internet advertising) and has become one of the main drivers of growth in the industry.

Thus, elevator video advertising is quietly gaining consumer attention.

      但是電梯內(nèi)空間有限，相較于在電梯內(nèi)安裝電視，電梯投影儀無疑成為更節(jié)省空間的方案。將電梯投影儀安裝在電梯內(nèi)最上方，通過監(jiān)測電梯門開關(guān)，實時將廣告投放到電梯門位置，無需利用額外空間。

    However, the space in the elevator is limited. Compared with the installation of televisions in the elevator, the elevator projector has undoubtedly become a more space-saving solution. The elevator projector is installed at the top of the elevator and the advertisement is placed in the elevator door position in real time by monitoring the elevator door switch, without taking advantage of additional space.

需求分析：

1、當天梯們關(guān)閉，廣告精準投放到電梯門位置；

2、有效判斷電梯門開關(guān)時間節(jié)點，保證廣告有效時長；

3、光源必須對人眼安全；

4、響應時間快；