First try to get a PCB layout gives way too much vias. This is where I spend days to get a decent PCB...
Seb 2009/7/21 funlw65 <[email protected]>: > > > > On Jul 21, 7:49 pm, Sebastien Lelong <[email protected]> > wrote: >> I think this assumes the peripheral on the other side (eg. a PC) understands >> RS232 level between 0 and 5V, instead of -12V and +12V. It's sometime the >> case, and to be sure, using a MAX232 chip is better. That said, with the >> "plug your own serial module" option, you can choose whatever you want. This >> gives a fourth option, a the cheap side, so we new have: >> >> - FTDI chip based USB-to-serial adaptor >> - 18F14K50 based USB-to-serial adaptor >> - MAX232 based, with DB9 connector >> - resistor based, with DB9 connector >> - (and last option: "my own way to deal with serial") > > Ok, not on board, but I thought they can be disabled by jumpers, and > can be a fast solution to test the software but yes, is not a good > ideea. > >> Some more thoughts about the board. Original Arduino Diecimila uses a >> Atmega168, a 28-pins chip. >> See:http://arduino.cc/en/Main/ArduinoBoardDiecimila. From this, 20 pins >> are "exported" through connectors on sides, where 2 pin are dedicated to >> RX/TX, thus involved in board's functionality (I mean there aren't >> completely free, as they are involved in serial). > > I don't know, maybe others have more ideas. First, I looked at > ATmega168 pins, to see some similarities at ports level but I think > the key is at software level. And is the only level where Pinguino > offers Arduino compatibility (and maybe the reason why the author > didn't offered a shielded variant). > For "reusing" Arduino shields, I think a study must be done. Studying > different shields with their software to see how interact with the > board. In what manner are used digital pins, etc. ... Because I don't > think they take in account very much the particularities of the chip > himself (I think the software is hiding the hardware). > Maybe is too much work but a shielded board is a must, even if not > Arduino compatible. This is jallib team decision, and I hope a good > board will increase the number of programmers using jal language > (unfortunately, the fact that jal don't have a math library is another > obstacle regarding to "mass" adoption - the new comers remain with > basic languages and advanced people go to C language). > > > > > -- Sébastien Lelong http://www.sirloon.net http://sirbot.org --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/jallib?hl=en -~----------~----~----~----~------~----~------~--~---
