Full-Cup Detector For The Blind

Posted on Jun 8, 2012

At the heart of the Full-Cup Detector is a 555-oscillator/timer configured to produce a 15-Hz click, until

Full-Cup Detector For The Blind
Click here to download the full size of the above Circuit.

its probe contacts are bridged, at which time its output frequency goes to about 500 Hz. This circuit can be used by the visually handicapped to determine when a cup or bowl is full of liquid (coffee, soup, etc). Ul, an NE555, produces ticks at 15 Hz. A set of probes (wire, etc.) is placed in the container at the desired level. When the liquid level contacts the probes, the frequency of clicks increases to several hundred hertz, depending on its conductivity.

Leave Comment

characters left:

New Circuits



Popular Circuits

555 Astable oscillator
Simple continuity checker
switching power supply 4
One Of Nine Sequencer
555 monostable trigger timing circuit