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  • Temperature Sensor with Digital Output

    This is a very simple to implement Temperature Sensor. It uses LM35DT as a semiconductor temperature sensor which operates with a +5 volt DC. VN:F [1.6.9_936]please wait…Rating: 5.8/10 (5 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Light Barrier Detector

    This simple circuit using a single transistor turns ON the relay when light falls on the LDR. The potentiometer is adjusted for the required sensitivity. The power supply is 6V. VN:F [1.6.9_936]please wait…Rating: 4.0/10 (1 vote cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Metal Detector

    The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. VN:F [1.6.9_936]please wait…Rating: 8.2/10 (5 votes cast)VN:F [1.6.9_936]Rating: +1 (from 1 vote)

  • Dew sensor

    Dew (condensed moisture) ad- versely affects the normal per- formance of sensitive electronic devices. A low-cost circuit described here can be used to switch off any gadget automatically in case of excessive humidity. VN:F [1.6.9_936]please wait…Rating: 2.0/10 (2 votes cast)VN:F [1.6.9_936]Rating: +1 (from 1 vote)

  • Color sensor

    Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow and cyan (secondary colours); and black and white. VN:F [1.6.9_936]please wait…Rating: 5.3/10 (3 votes cast)VN:F [1.6.9_936]Rating: +1 (from 3 votes)

  • Magnetic proximity sensors

    Here is an interesting circuit for a magnetic proximity switch which can be used in various applications. The magnetic proximity switch circuit, in principle, consists of a reed switch at its heart. VN:F [1.6.9_936]please wait…Rating: 7.8/10 (6 votes cast)VN:F [1.6.9_936]Rating: +3 (from 5 votes)