MAX232 to RS232 level converter

As you can understand from the title, this article is a short manual about assembling of the device which allows making the connection between your uart device and a PC by COM port.

assembled converter

I’ve assembled my converter at the simplest schematic: two wires from the RS-232 port and two wires to uC – it is enough for my needs. Here is a beautiful picture with this schematic (I got it from

I’ve made PCB in Altium Designer:

There is a small bug at this PCB: I had footprint only for the male connector and when I tried to remake it, I made a mistake – right signals not on 2, 3, 5 pins, but on 1, 3, 4.

Here is a 3d version of PCB, just for fun 

Now, time for a test. Just shorts TX and RX and type and terminal any symbol: if the device works properly, you see this symbol at the terminal immediately, like that:

1 thought on “MAX232 to RS232 level converter

  1. Pingback: Pic Lab, PIC16, Experiment #14, USART (UART) module |

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