Wireless Status Indicator
It is a wire-free communication project.We can reduce our time elapsed in the inspection of status of devices without going near to them.The project has two parts;transmitter & receiver.
Terminals P1 toP4 are used to connect the phase supply of the devices with the common earthing terminal.Whenever any device is switched-ON,a phase current runs in the circuit through P1/P2/P3/P4. Optocouplor IC(MCT2E) converts this phase signal into DC value & provides to the encoder IC(HT12E) where the corresponding signal is modulated with an RF-module(TX-433) and transmitted via an antenna upto a long distance. Hence,upto four phase signal can be connected with the project simultaneuosly.
The transmitted signal is demodulated here and the corresponding red LEDs will blink to show the status of devices.A blue led shows the signal receiption & it must be blinked for correct result.If the blue led is not blinked,then the receiver circuit is out of coverage of the transmitter & result may be incorrect.