Hi everyone,
I need ur help to build a circuit for my sub-project.
I just want to transmit data using infra red (in range up to 20 cm), but i dont know how to make the circuit. I dont matter bout the carrier frequency.. (usually 38 kHz or the other). I still use microcontroller AT89S52. And I want to use TSOP 48xx (cz i havent try with photo-transistor or photo diode)
The problems are :
1. How can I modulate data with the carrier frequency? use AND gate or something else?