>Mmhh... USB bootloader is far bigger than Tinybootloader. Saves space. >Except for Jaluino Mini (18F14K50, breadboard pluggable, minimum hardware parts), better use Tiny.
I agree that Tiny is nice, but basically you'll have to offer the UART for Host PC communication (same i true if you have a FTDI converter chip), if you use native USB, you still have a UART available for JALuino shields. >Not necessarily if using hardware for Tiny apparently. Resetting PIC >without >manual operation should be available without any shields required IMO >(basic >and very useful feature). It is possilbe if you add a MAX-232 on the board, and connect one of the hanshake lines via a capacitor with the reset line >Sure, but I'm not talking about taking power from a standard RS232, but >from >a USB-to-serial converter. Actually power is taken from USB. Yes this is possible, you can take the 5V from the USB connector, don't know if you can configure the USB device current (100mAor 500mA), if you use native USB, we can control it from the firmware and be able to draw 500 mA max > > > > > (last thought: Using PIC LF versions, we can make them run at lower > voltages > > than 5V. My USB-to-serial converter also is able to provide 5V or 3.3V > (and > > many of these provide the kind of things). Will this work with 3.3V for > > instance ? > > Dont see why not, but then all of your shields must be working with > 3.3V > or you also need to add 5V and than every body needs to be careful not > to blow up the anything because of mixed up power. You dont need a LF device, the standard F devices will run at 3.3 volt as well >Albert also suggested to build a serial module based on a 18F14K50, just to >make a conversion between USB and serial. This option would be cheaper than >a FTDI-based solution. And is available in DIP housing, so far more homebrew friendly than TSOP or QFN devices, You can buy pre-fabbed FTDI modules, but they are in the 10-30 Euro range, but the problem with these pre-fabbed units is that we dont know when they become obsolete, so there is a great risk that these units can not be bought next year.. I know that the 18f14k50 is not easily to obtain (except from Farnell, Digikey & Microchip direct), but we might do setup a group buy for 18f14k50 devices, besides the PIC only a capacitor, 12 MHz crystal and USB connector is required, so < 5 Euro on parts, to make a USB->RS-232 converter. Albert --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
