Wednesday, December 19, 2007

RS232 to TTL Conversion Using Bipolar Transistors


There is a simple trick to transform R232 levels to TTL levels by just using 2 bipolar transistors.
See the attached schematic.

This is useful for micro-controller boards when using serial communication with the PC.

For PIC micro-controller serial communication routines are here.

2 Comments:

Blogger Unknown said...

Hi Berdin,i have been battling with the design of this circuit for my project. please what formula will give me the value of the resistors

7:49 AM  
Blogger Unknown said...

Hi Berdin,i have been battling with the design of this circuit for my project. please what formula will give me the value of the resistors

7:50 AM  

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