Often, the only liquid level indicator you need is your eyes, such as when looking at your cold beverage on a summer’s day. Other times, though, it’s useful to have some kind of indicator ...

Thus, you have a useful liquid level indicator with seven distinct output levels. It’s a neat build that might prove useful if you need to check levels in a big opaque tank at a glance.

Here is a project for a simple water turbidity indicator that can be fabricated using a set of commonly available inexpensive electronic components. Although this is a crude concept, it can be easily ...