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Ok i tried it with a NPN Transistor but it didn´t work.
So I measured the Voltage of the PSP Serial Output (Pin 3) and found out that it seems to be negative.
Therefore i think i have to use a PNP Transistor.
I hope it will finally do :)

Good idea with the transistor. Because the problem with the pins 1 to 10 and 21 to 28 is that they can´t be used with the command serin ... the pins 21 to 28 are outputs and the others are inputs but portA and so they only can be used as on/off trigger or analogue. But i will try to make it working ...

When i try to run the Pic under 2.5V it runs but neither the psp nor the pic receives anything. And i also tried to give the psp 3.6V (ok i know its hard but the psp is still alive :) ) over the serial port and then the psp receives but the Pic don´t receives something. Or do i have any mistakes in ...

Hmmm but i have not connected the PSP over the 2 mentioned pins . The Picaxe can receive on all Input Pins with the command "serin". So i used the Input 3 (Pin 14) to receive the date of the psp. But i think that what you said will also apply to this pin (not the same voltage between psp a...

It is the fat psp and the microcontroller runs at 3.6 V

Hi, I try to connect my PSP with a Picaxe (28x1) over the Serial Port of the PSP. The connection to the PSP is ok, so i can send bytes from the microcontroller to the PSP without any problems. But when i try to send something back from the psp to the microcontroller nothing happens although all wire...