Hi!! I am studying a project ''Vissible Light Communication'' and i want to use a device (transmitter-receiver) to transfer some words (a text) from a raspberry pi, to another raspberry pi by VLC technology. I have a block diagram(https://drive.google.com/file/d/0B2dujy5BLm-uMWtsaGxoYWk5QWs/view?usp=sharing) and the circuit contains an attiny85 microcontroller. The receiver is the same circuit without transistor. So i want your help to programming the attiny85 mc for the transfer above. And a bit of code like python for linux terminal to write the text.

 

Why is your darlington in emitter-follower configuration?

 

Why is your darlington in emitter-follower configuration?

Because is a high frequency tranzistor. So, i think work better with a 16MHz or 20 MHz oscillator. This cisrcuit is not mine. I found it searching at google

 

@pakegeo have you done your project?