23-05-2012, 12:40 PM
IR BASED ENERGY CONSERVATION SYSTEM
IR BASED ENERGY CONSERVATION SYSTEM.doc (Size: 28.5 KB / Downloads: 41)
An embedded project is a combination of hardware and software designed to perform a specific task. The main scope of this project is energy conservation.
Counting Technologies offers highly-accurate infrared-based people counting solutions to gather valuable customer information. Active infrared (IR) measurement involves the use of a small sensor set which emits and detects an invisible beam of infrared light. The unit has an optical lens system and electronic circuits to emit a narrow beam of pulsed light from an infrared light emitting diode. The counter is a two-sided set, which allows lower power requirements resulting in longer battery life.
As a person walks through the beam, the light is absorbed and reflected. The beam is momentarily interrupted and a counter is incremented. Light modulation techniques ensure that the counting is more reliable and not affected by infrared light emitted from other sources, such as sunlight. The direction of a person's movement is determined using a dual-beam system. Using a dual-beam system, the unit can distinguish between one beams being interrupted prior to the second beam being interrupted. Two IR transmitter-receiver pairs are used at the passage: one pair comprising IR transmitter IR TX1 and receiver phototransistor T1 is installed at the entry point of the passage, while the other pair comprising IR transmitter IR TX2 and phototransistor T2 is installed at the exit of the passage. The IR signals from the IR LEDs should continuously fall on the respective phototransistors, so proper orientation of the transmitters and receivers is necessary.
According to the number of persons inside the hall, the electric appliances like lights, fans etc works. An LCD is attached to display the no of persons inside the hall. If nobody is inside the room, then system will turn off all the electric appliances and hence save the electrical energy.