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).
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