When you buy through our links, Business Insider may earn an affiliate commission. Learn more Apple doesn't give new iPad models simple numbers like the iPhone series, which can complicate ...

Robert Kelly is managing director of XTS Energy LLC, and has more than three decades of experience as a business executive. He is a professor of economics and has raised more than $4.5 billion in ...

(2) You are limited to two withdrawals a year or the rate drops (3) You are limited to three withdrawals a year or the rate drops (4) You are limited to four withdrawals a year or the rate drops ...

These devices have key drawbacks. Water level indicators require manual pump operation and often waste power as multiple LEDs ...

Build a light-activated switch using LDR that lets you control home appliances using your mobile phone's torch.

（1）进行液位监测与控制的整体研究与设计。 （2）利用投入式液位传感器测量液面高度。 （3）通过采集液面高度的数据，准确的判断当前值是否在设定范围之间，如果大于设定最大值，则水泵开始工作，直到液面高度值达到最大值时，水泵停止工作。如果 ...