T.K. builds an Optical liquid level sensorSometimes we need a non-contact liquid level sensor. There are several ways to build that, but the easiest is to try an optical liquid level sensor. You may ...

If the liquid level cannot be detected, we can open the back cover of the sensor and use a small screwdriver to adjust the sensitivity knob (simply turn it counterclockwise to increase the sensitivity ...

If only it were simple. THE NATURE OF A LEVEL DETECTOR The level detector is a circuit that observes the incoming audio signal and derives from it a DC control voltage that will, after manipulation by ...

By itself, the distance sensor wouldn’t do much so [David] made his own PCB Board to hold all the necessary circuit components. The brains behind the operation is an Atmel ATtiny861 20 pin ...

A low-level detector from the National Safety Institute can detect levels as low as 5 ppm. The EPA notes that no carbon monoxide standards have been established for indoor air.