It would really be great to have some SMT pads for SOT-23 and SOIC pads. On the SIOC, perhaps SO-14 (can always just use a portion if say you only need SOIC-8)
William
Suggested enhancements to JeePlug Experimenter Boards
(8 posts) (3 voices)-
Posted 14/05/2010 01:00:43
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I've got a few plug-sized SOIC-20 breakout boards with a port header on it, which I haven't made available. See
Posted 14/05/2010 10:44:25 -
Nice board! That's what I had in mind, and another for SOT-23. Until then I can get the SOT-23 to dip from Sparkfun. Thanks!
Posted 14/05/2010 12:55:09 -
I guess your SOIC-20 board would work with the SPI flash chip like the one on your jeenode-USB? I'll look around to see what generally you advise for SPI devices. I'm trying to stay with I2c but that is a tempting memory device.
Posted 14/05/2010 16:33:35 -
The JeeLink is the one with the SPI DataFlash on it, I assume you meant that.
SPI requires a bit more care, because there's also the RF12 driver using it - using interrupts and needing attention every 140 µS or so when a packet is coming in. I've side-stepped that issue in the current RF12demo (just dropping packets), for now anyway.
If you're after lots of storage, you could also use an SD or µSD card (most cards can be put in an emulated SPI mode). Huge amounts of storage, but slower than DataFlash in SPI emulation mode, I think - so even more caution w.r.t. the RF12 driver.
(if you want the SOIC-20 plugs, please email me)
Posted 14/05/2010 17:47:59 -
Actually, I spent the last hour looking at SD card solution -- I've implemented dataloggers for picmicros in C previously. I notice that the ELM-CHAN 'petite' library has been enhanced to support writing to the SD card- he has a new version of his gps datalogger now. I've used his full-featured library on picmicro and Arm systems and find it works well.
I may 'cheat' and put a separate 328p down to handle the SD card demands, and send ascii serial stream across to it for logging. I can either use a non-rf jeenode or maybe a RBBB.
I may in fact email you - I'm interested in a few things that are not mentioned on the Modern site. Thank you!
William
Posted 14/05/2010 18:18:05 -
hey bvwelch - I'm also interested in SD card logging. I asked JCW about it recently, but don't think it's high on the priorities list. I've just picked up a Sparkfun Openlog which might do, though ups the $$ a fair amount, particularly when paired with an RTC plug.
Posted 15/05/2010 16:54:40 -
Hi Edward, I noticed the Openlog last nite. Let me know how you like it. Worst case, we can replace its firmware with the ELM-CHAN code. I have used ELM-CHAN code for a few years and it has been reliable for me. Note his examples, including his latest gps datalogger.
Posted 15/05/2010 17:10:35