THROUGH THIS CIRCUIT WE CAN TRANSMITTE DATA BY LED USING KEYBOARD .

1. LED DATA TRANSMITTER CIRCUIT USING KEYBOARD
MicrocontrollerCircuit
The transmitting microcontroller will be 8051. The USART module inside of this microcontroller will be
used to send the asynchronous serial data. The microcontroller will continuously send a count value from
0 to 8 and then repeat.
TransmitterCircuit
The 8051 output port cannot supply enough current to give the emitter LED the power it really needs, so
a buffer circuit is used with 2 transistors so that the Emitter LED is driven from the main +5v regulated
power supply.