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Messages - dpropicweb

302
Project development, ideas, and suggestions / Re: Open source project idea: Computer controlled PS/function gen/multimeter
[quote author="garak"]
Lots of measurement inputs is a must(multimeter functionality). The ability to measure DC & AC signals to at least 40khz and up to 220v with good auto ranging.
[/quote]

Some parts of the world exceed 220v (our line voltage downunder is officially 240v - in reality it is closer to 260v most of the time to account for peak load). See http://www.controlledpwr.com/help-inter ... ltages.php for a good summary of official line voltages. A number of grey-market 220v rated computer peripherals have gone up in smoke round these parts :)
303
Web platform / Re: Web platform not working, whine coming from board
The symptom of the bootloader timing out and looking like a defective web platform was discussed in the thread at http://dangerousprototypes.com/forum/in ... opic=572.0 where it turned out to be too much AC ripple on the supply voltage from the plug pack. If you don't have another plug pack, you could try some batteries.

As for the "whine" - I've never heard that, but then I not been listening for it.
306
Web platform / Re: noob cannot get demos to work
I've used a 4Gb micro-SD card - can't buy anything smaller these days, except at exhorbitant prices that is - and a 16Gb micro-SD card with no problems.
307
Web platform / Re: noob cannot get demos to work
> i tried the precompiled hex and compiled  one locally  they act the same

The precompiled one works for certain, so you must be not doing something expected :)  Is your DHCP server online and enabled?

> on a side note should the lights on the cat5 jack light up when i plug into the router ?
> and the ld1 light blinks continuously

They're not connected by default. Instead, the connections are routed to two of the LEDs on the top right edge of the board next to where the heartbeat LED is flashing. If that LED is flashing then the firmware is running - so I suspect your DHCP server is not handing out IP addresses...
309
#twatch network LCD backpack / Re: Dev version of the #twatch
The topic has been raised before... here's MCHP's response (in 2006):

"Dear Microchip customers,
 
Thank you for bringing your concerns to our attention. As always we would like to help solve your application's requirements.
Regarding the particular issue noted here (ie 100 write cycles):

   1. Microchip's dsPIC products are offered in 2 families - dsPIC30F and dsPIC33F. While the dsPIC30F flash has a typical endurance of 1 Million E/W cycles, the dsPIC33F has a typical endurance of 1000 E/W cycles across -40 to +85C temperature. The difference is due to the different process technologies implemented on the two families.
   2. Microchip is actively characterizing the current dsPIC33F and PIC24H Flash Memory so as to provide our customers with improved E/W endurance and retention performance on these initial products
   3. We are fully committed to supporting applications that require 16-bit controllers. There will be future products which support enhancements to the Flash endurance specifications. We are fully aware of the difference in the specifications and strive to make product improvements to meet your needs.


For customers using products available today, we suggest the following options:

   1. Enurance at room temperature is typically much higher than the datasheet endurance and should not be a problem while debugging. If Flash endurance may be an issue during development and debugging please request more samples from http://sample.microchip.com . Samples are free.
   2. If Flash endurance beyond 1000 W/E cycles is required during application run-time, we suggest:
          * Use dsPIC30F products when you need high endurance internal Flash and EEPROM.
          * If using dsPIC33F products, cycle through a block of program Flash words so that you are writing a different word of program memory on each write cycle. This effectively increases the endurance. This applies to applications in need of internal EEPROM.
          * Using our line of serial EEPROMs that are available in space-saving 2x3 DFN or SOT packages. We offer both dsPIC33F and Serial EEPROMs at attractive costs.

Best Regards,
Microchip Technology Inc. "
310
#twatch network LCD backpack / Re: Dev version of the #twatch
The 3V MCHP Newsletter (April 2007) lists the PIC18F97J60 as having 1K writes (typ). The 2nd generation 18J series has 10K writes (min), but no ethernet specced chips fall into this category (yet anyway).
311
Web platform / Re: ENC28J60 becomes hot
One of my web platforms has been running non-stop on the network since May and the ENC28J60 temperature is currently around 38.1C (ambient air temp is 25.5C). It's certainly not hot to touch - just perceptibly warm. (Temps tested with tropical aquarium contact thermometer over the course of 5 minutes.)
313
Web platform / Re: MicroChip demo pages functionality
[quote author="rhyde"]
Trev, do you have a zip or listing of all the steps to get this up?  I just fixed the crystal, and I was thinking of trying to get things up.  I am not sure if the best bet is the microchip sd demo, or the UIp port, but I have had these board long enough I need to get them up doing something.
[/quote]

The original post above contains the step-by-step process that I followed. I think you'll find the SD demo (everything available in the MCHP stack) is considerably further along than the UIp port which is still a work in progress (ping, telnet are working, reading some SD cards also works). I used the ZIP from the google code page and followed the instructions therein to merge it with the MCHP files.

My current version of the SD demo has a few more enhancements but mainly for debugging (eg it outputs the current page being accessed to the UART/USB) and is to control a bunch of relays in preparation for its intended use as a remotely accessible device to turn on/off the power from my UPSes to various servers/routers/switches  (assuming one of my two ISP links is still functioning).

PM me if you want more... :)
314
Web platform / Re: Web platform available for backorder at SeeedStudio
@rsdio I believe it was 100, because 15 were back ordered and there were 85 left when they returned to "in stock".

@Ian I'm not all that surprised - it's very cost effective and, dare I say it, superior to its commercial competition.

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