Hello everybody
I have made this JDM pic programmer. but I don`t know the serial cable that I should use, cross, or direct ???
the programmer image and schematic are below :--
Well, for 30+ years I always
Well, for 30+ years I always tried what I thought it should be and then crossed if it didn’t work. Never had a problem. But not long ago I bought a RS232 level shifter from Polulu and it failed to work. Their support folks say I fried it from tying Tx to Tx. I don’t believe that, but I now modify my advice to say trying connecting the pin you think is Tx to what you are sure is Rx and verify the connection by looking for data.
IMO
Instructables isn’t much use. They are always vague and I hate how they want you to pay for information that you can get for free. You might do better to google for jdm programmers and find a better writeup. I know this isn’t much help. here’s another one.