Double functions water quality detection circuit

Published:2011/4/11 1:39:00 Author:Nicole | Keyword: double functions, water quality detection | From:SeekIC

The circuit adopts LM324. Adjusting W1 to make the output voltage of A1 change with light intensity between 0~4V. Probe T is two sheetmetals, put them into water, the resistance between them will change with the quantity of ions in water, A2 output changes too, it is adjusted by W2. A3, A4 form window comparator, W3, W4 decide window range. When VA4-<VA3+, VB<VA4-, F is 0 , E is 1 , D4 is red light; when VA4-<VB<VA3+, E=F= 1 , D is orange light; when VA3+<VB, E= 0 , F= 1 , D4 is green light.



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