Hi Seb,
> > If you want to create a RS232 with a MAX232 you must > > select for the source, Jack (JP1) or USB (JP2) and place > > a jumper on JP4 to supply 5V to de serial connector. > > I'm not sure to understand: > > - option 1: I want to power the board with a Jack. To do so, I put a > jumper on JP1. JP2 and JP3 remain clear. If I want the serial module to be > powered, I put a jumper on JP4. > - option 2: I want to power the board with USB. To do so, I put a jumper > on JP2. JP1 and JP3 remain clear. If I want the serial module to be powered, > I put a jumper on JP4. > - option 3: I want to power the board with a serial module, provided it > can. To do so, I put a jumper on JP3. JP1 and JP2 remain clear. It doesn't > matter whether I put a jumper on JP4 or not, the result is the same. > > Is that right ? No, don't place a jumper on JP3 AND JP4 at the same time, if you do so your circuit and source is not protected by fyse F1 > > Is it possible to replace JP1, JP2 and JP3 by a "tristate" trigger so > there's no possibility for a user to put jumpers on JP1 *and* JP2 for > instance (I could do this...). This would make the board more foolproof... > if you know what I mean :) Yes but than your pcb will become more complicated and it must be a home brew one The moment you work with a pcb it is smart to know something about your board or at least read the description (we must make) very careful or else you can blow up your board. As the schematic already say, jumper on JP1 or JP2 or JP3, in the manual (we need to make), we must tell them explicit not to place more than 1. > > > > Also ask by Seb is the reset option by RTS (J7). > > OK this is where I'm lost... I have few questions about this: > > - RTS and CTS in serial connector are connected to RD5 and RD4. Why ? If you want handshake you can use RD5 and RD4, if you don’t need handshake you Can use RD4 and RD5 on connected I/O4 > - when I want to reset the board using RTS, I need to switch RTS J7 > trigger to position 1-2, as in the schematic. Is that right ? Yes, if you put it in position 2-3 you can’t use reset but you can use handshake. If I did not use the switch (is jumper) than you could not use RD4 as normal I/O because PIC would reset as soon as RD4 becomes high. > - All the serial modules I've used or built have their RTS connected to > CTS. No flow control, quite common I think. Like in this > article:http://www.lynxmotion.com/images/html/build125.htm. Now imagine I use > such > a module with RTS and CTS connected. I plug it to the board. Will this work > ? Or should RTS and CTS remain unconnected from each other ? In that case, > do I have to deal with flow control ? (hope not...) Yes this will work and No you don’t need flow control, but like in your link don’t connect the RTS end CTS from the serial module to the serial connector of the Main Board else you can’t use RD4 and RD5 for other purpose. > > Sounds like silly questions, but this whole reset thing is not clear for me > :) Those are not silly questions, just questions. On software terms I know that I have sometime questions witch are simple to you all but a question mark for me, still does not make the questions ore me silly (do they?) :-). > > > The serial connector is pin compatible with the Bluetooth to serial > > converter > >http://www.sparkfun.com/commerce/product_info.php?products_id=582 > > > The leds, PB and I2C are gone and must be made on a shield. > > On a 2 layer pcb we can place them even with more bells and whistles > > but better keep the homebrew one simple. > > OK, you're right we need to keep the home brew version as simple as > possible. > > > > > I maintained the reset on the power connector similar to Arduino if > > you don’t mind. > > better not used and have than needed and don’t have, if you now what I > > mean. > > Yes, sure, and I do know what you mean. > > > > > The connectors are more routable friendly connected to the 18F4550 (I > > hope) but > > this I will notice as soon as I start with the pcb. > > > If you all agree I will use female array 2,54mm(0.1”) pitch connectors > > for I/O, > > male rectangle array 2,54mm pitch connector for serial and ICSP, > > B-type USB connector and PCB power connector, see Farnell nr 1608726. > > About shield connectors, they'll have to be tall enough so all the > components can fit under the shield. Like these ones, being used to build > shields (they also have long pins so they can be plugged on the mainboard > and expose shield connectors to other shields at exactly the same place): I will make a drawing with dimensions for placing the connectors on a shield board So every body can make a shield board. Dimensions will be in inches, which is common in pcb world I already made a template for shields so I can easy make them (connectors are already in place), > > http://www.sparkfun.com/commerce/product_info.php?products_id=9279http://www.sparkfun.com/commerce/product_info.php?products_id=9280 > > > The schematic is placed in the file section. > > Thanks. > Can you also provide the source files, loaded by your application. BTW, what > application are you using to build this ? Orcad capture 10.0 I will download the file you need as soon as it is finished OK? > > > Because shields must be of one size in depended if they are for Medium > > maxi or bigger > > I don’t expect a big difference in pcb size between medium and maxi. > > Because real difference will be the number of I/O, I think nobody will > > be interested > > in Jaluino medium with a 18f2550. > > Is it an idea to have Jaluino mini for 18f14K50, Jaluino Medium for > > 18F4550 and Jaluino Maxi > > for something like the 18F87J50 (mentioned by Seb)? > > I first tried to use a 18F4550, but the PCB was too complicated, so I > switched to a simpler one using 18F2550. If you can do the magic and use a > 18F4550 and still keeping a simple & small enough PCB, that would be great ! > OK, see the file section Jaluino_maxi_pcb Maybe I can make the pcb a little bit smaller (if you all insist) but not much. I expect that only 3 via’s (wire bridges) are acceptable ;-). Greetz Richard --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
