2009/7/20 Sebastien Lelong <[email protected]>: > > - we should also have a connector for serial comms. Here I can see 3 options: > 1. using a DB9 connector, and MAX232 chip. Big. > 2. using a FTDI converter. Small. Expensive. > 3. as Albert Faber suggested in the post, using a 18F14K50 to > build this converter. Cheaper than FTDI. (as far as I'm concerned, I > can't easily find this chip, except with high shipping rate, making it > almost as expensive as a FTDI chip). > 4. No other connector. We use the first, and use a USB bootloader. > Guru Albert already developed one with jal (but bigger than tiny > bootloader, see later). Serial comms. are done through this USB > connector. I'd personally prefer to have a connector wired to TX/RX, > in addition to USB connector.
And if we do none of the above, we can have a 4-pin header: - ground - 5v - tx - rx Cheap, small and still ease to access serial port (with only one convertor you like for all your boards). > - I²C: alsways a must. An "I²C ready" board allows many experiments > and is opened to many 3rdparty chips. I propose a 5-pin header here with the following layout: - ground - scl - sda - 5v (= regulated ps of pic) - 9v (= unregulated input ps) And optional pull-up resistors. Joep --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
