Proximity Sensor using HO 4R Sensor. Sensor Circuit 8


You can make a Proximity Sensor using the Infrared Dual Reflective Sensor Module HO 4R. It is a package containing an Infrared LED and a Phototransistor arranged side by side with an opaque partition in between them. In front of the module, there are two small openings, one for emitting IR rays and another for receiving the reflected IR rays. When there is an object in front of the module, IR rays reflects from the object and triggers the Phototransistor and the connected circuit will be activated. Range of the circuit is few centimeters.
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Corridor Lamp. Sensor Circuit.7


A Simple White LED Lamp to give light in Corridor or Staircase during night. It saves energy considerably since Zero watt (Not Zero but 15 watts) or CFL (minimum 5 watts) is usually used in such places. The White LED lamp automatically turns on when the ambient light reduces below the set level. It can give sufficient light in a confined area. The circuit is provided to familiarize the working of AND gate IC 7407.

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