Block Diagram:

Working Principle:

Here it consists of two units:

1. Transmitter unit

2. Receiver unit

The transmitter unit is fitted to the wall/ceiling. In the transmitter the modulated information is transmitted through LED. The receiver unit demodulates the encoded binary data and give the response in the from of voice to the person . The receiver unit consist a photo transistor which receives the information from the LED connected to the transmitter. The information consist of location, and whenever receiver module comes in the range of that transmitter area than corresponding location message is send to receiver is stored in the microcontroller and processed further to initiate voice to guide the person and vibrator motor to navigate the person which can assist people at indoor places.

Kit Contains:

TX: