The sensor in this application, a BPW21R photocell (from Vishay), is used to generate photocurrent proportional to the ambient light intensity (see the figure).

Needless to say, a simple add-on hardware is necessary for this little experiment. The hardware is nothing but an ambient light sensor circuit wired around the silicon NPN epitaxial planar ...

Circuit diagram of the PIR Motion Sensor Light and Switch based on SB0061 shown here can be used for security or corridor lighting in power saving mode. The 12V DC supply required for the whole ...

The simple circuit interfaces a 1-Wire temperature sensor (DS18S20) to a Cypress microcontroller (CYBC26443). But the technique can be extended to any other 1-Wire device with little modification ...