Hi, Mabe a bit late, but why don't you take 40pin chip? I once used an arduino but ran out of pins before the end of my project. And earlier this week, a friend brought a arduinomega - atmege1280 processor with plenty of flash, ram and pins. Great! (too bad he took it back with him...)
Joep 2009/8/6 Sebastien Lelong <[email protected]>: > Interesting but there's no schematic... Also, do you really want to make it > compatible with Arduino ? That is, connectors carrying the same pins, with > the exact same position ? I'm not sure it makes sense, because as for PWM, > there aren't 6 PWM channels in a 18F2550. I guess Pinguino offers more > channels but it's in software, not in hardware. Same for ADC: Arduino has 6 > of them, 18F2550 has 10. How will you deal with that ? > > (btw have you also check my last try ? > http://jallib.blogspot.com/2009/08/jaluino-medium-18f2550-based-first.html) > > Cheers, > Seb > -- > Sébastien Lelong > http://www.sirloon.net > http://sirbot.org > > > 2009/8/6 funlw65 <[email protected]> >> >> My trial on Arduino layout >> >> http://sites.google.com/site/funlw65/electronics/jaluino-pinguino-28-pins-starting-bo/freejalduino >> >> On Jul 26, 12:43 pm, Sebastien Lelong <[email protected]> >> wrote: >> > Hi, >> > >> > Here's a new schematic for Jaluino Medium board:18F4550 is replaced by >> > smaller 18F2550, so the PCB layout is expected to be easier, helping >> > focus >> > on schematic rather than layout issues. I've recently received a couple >> > of >> > them, so I'll be able to prototype few things. >> > >> > I tried to include Albert's suggestions, hoping it's correct now... >> > Power >> > supply can be from USB or external, selected using a jumper. >> > >> > Any comments ? >> > >> > Cheers, >> > Seb >> > >> > 2009/7/26 Sebastien Lelong <[email protected]> >> > >> > >> > >> > > Hi Albert, >> > >> > > And many thanks for this ! For now, I think I'll go with solution B, >> > > which >> > > is the one I understand the most... >> > >> > > Seb >> > >> > > 2009/7/25 a.faber <[email protected]> >> > >> > > Hi Seb, >> > >> Attached 4 possible solutions >> > >> > >> Solution A: Almost the current solution, except added a bypass diode >> > >> across >> > >> the 7805, so it won't blow up if there is USB 5V and not external 9v >> > >> Solution B: Current solution, except make power selection via a >> > >> jumper >> > >> selection (less user friendly, no voltage drop) >> > >> Solution C: Auto power selection via 2 schottky diodes (drawback, >> > >> voltage >> > >> drop of ~0.3v) >> > >> Soltionn D: Auto power selection with self power dominance (drawback, >> > >> voltage drop of ~0.3v) >> > >> > >> General remarks: >> > >> D6, D7, D10, D11 in my schematic does not have to be a schottky type >> > >> if >> > >> the >> > >> external supply is > ~8V >> > >> L1,L2,L3,L4 (ferrite bead, or power choke), not realy required, but >> > >> recommended >> > >> > >> Albert >> > >> > >> ----- Original Message ----- >> > >> From: "Sebastien Lelong" <[email protected]> >> > >> To: <[email protected]> >> > >> Sent: Saturday, July 25, 2009 12:42 PM >> > >> Subject: [jallib] Re: jaluino (first schematic... Richard ?) >> > >> > >> Hi Albert, >> > >> > >> I tried to do some research, but I'm lost, this is far beyond my >> > >> understanding and I can't figure out how to deal with self-power >> > >> USB... I >> > >> need your help, would you mind giving me an example of self-powered >> > >> USB >> > >> vs. >> > >> not self-power USB ? Your 18F14K50 PIC is self-power isn't ? I can't >> > >> see >> > >> the >> > >> difference with my schematic... >> > >> > >> Also, I've found something about using a shottky diode to select +5V >> > >> from >> > >> regulator or +5V from USB (see picture, part of schematic from an >> > >> Arduino >> > >> board). Is that what you were talking about ? >> > >> > >> Cheers, >> > >> Seb >> > >> > >> 2009/7/23 [email protected] <[email protected]> >> > >> > >> > Hi Seb, >> > >> > Some comments on the schematic: >> > >> > >> > In the current schematic the 5V and USB-5V are connected, this is >> > >> > not >> > >> > according to spec, >> > >> > see also the datasheet about USB self-powering. Either way, use a >> > >> > jumper selection for the >> > >> > power supply or use some shottky diodes, in addition it might be >> > >> > wise >> > >> > to place a by-pass diode >> > >> > across the 7805, since these devices don't like to be reversed >> > >> > powered. >> > >> > >> > Why R1? I think you can remove it, since the reset pin is held high >> > >> > via R5/D2 >> > >> > >> > Be sure to put a 100n bypass close to VSS/VDD pins of the PIC, I >> > >> > don't >> > >> > know if C2 is the PIC bypass cap, if so I would >> > >> > draw it closely to the PIC VSS/VDD pins >> > >> > >> > BTW, the 18f14k50 board is working fine >> > >> > >> > Albert >> > >> > >> > On Jul 22, 9:37 pm, Sebastien Lelong <[email protected]> >> > >> > wrote: >> > >> > > Some more thoughts about Jaluino (next guy who talk about math >> > >> > > lib, >> > >> can >> > >> > you >> > >> > > modify the subject plz ?)... >> > >> > >> > > The connector's layout is very important, as all shields will >> > >> > > have to >> > >> be >> > >> > > compatible, and will reproduce this layout. >> > >> > > For instance, Arduino diecimila has 4 connectors: >> > >> > >> > > - 2 on on this upper side >> > >> > > - 2 on the bottom side, 1 being reserved to power >> > >> > >> > > Arduino mega uses a much bigger AVR than Diecimila. They put a >> > >> > > double >> > >> > > row >> > >> > > connector, on the right side. Still, the four previous connectors >> > >> > > are >> > >> on >> > >> > the >> > >> > > same place. As a consequence, shield for Diecimila can be used >> > >> > > with >> > >> > > Mega. >> > >> > >> > > I'd like to reproduce the same. If we build first Jaluino board, >> > >> > > 18F2550, >> > >> > it >> > >> > > could have the same connectors as in Arduino (2 on upper side, 2 >> > >> > > on >> > >> > bottom >> > >> > > side). Next step is a 18F4550 based board. We could add a single >> > >> > > row >> > >> > > connector on the right. In the future, if we decide an even >> > >> > > bigger >> > >> PIC, >> > >> > > we'll be able to double this left connector. >> > >> > >> > > That said, I still can't produce a PCB, I'm having a lot of >> > >> > > trouble >> > >> > placing >> > >> > > parts to avoid vias... Any PCB guru here ? >> > >> > >> > > PS: as a bonus (...) here's my last schematic, with connectors. >> > >> > >> > > Cheers, >> > >> > > Seb >> > >> > >> > > 2009/7/21 Sebastien Lelong <[email protected]> >> > >> > >> > > > 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). >> > >> > >> > > > -- >> > >> > > > Sbastien Lelong >> > >> > > >http://www.sirloon.net >> > >> > > >http://sirbot.org >> > >> > >> > > -- >> > >> > > Sbastien Lelonghttp://www.sirloon.nethttp://sirbot.org >> > >> > >> > > jaluino_sch2.png >> > >> > > 56KViewDownload- Hide quoted text - >> > >> > >> > > - Show quoted text - >> > >> > >> -- >> > >> Sbastien Lelong >> > >>http://www.sirloon.net >> > >>http://sirbot.org >> > >> > > -- >> > > Sébastien Lelong >> > >> > >http://www.sirloon.net >> > >http://sirbot.org >> > >> > -- >> > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org >> > >> > jaluino_sch3.png >> > 51KViewDownload >> > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "jallib" group. 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