RTC board

https://github.com/MiSTer-devel/Main_MiSTer/wiki

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cvenditti
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Re: RTC board

Postby cvenditti » Thu May 17, 2018 3:10 pm

Arrow have the AD7415ARTZ-0500RL7 for $2
https://www.arrow.com/en/products/ad741 ... asheets360

I'm ready to order 10. That will boost the price of the RTC from $14 to $16 but I think people will be happy to monitor the temp.

I know it is definitely not a priority but do you have a time frame for the temp. monitor implementation?

Thank you
Cyril

Sorgelig
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Re: RTC board

Postby Sorgelig » Thu May 17, 2018 7:23 pm

As soon as i will have time for this and overall picture how it should work.
Actually, this feature is not even announced. Placement of sensor is not so good as it has no direct contact to FPGA chip. So, the measurement won't reflect actual temperature and will be affected by environment and even airflow direction where sensor will show 20C while real FPGA chip has 70C. Thus it cannot be taken in account when you judge the chip heating.
You need to create a compatible environment to make measurement somehow reflect the actual chip temperature.

So, this whole complexity stops me from offering temperature measurement function. Users will relay on this while it may not reflect the actual temperature.

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Re: RTC board

Postby Frederir » Thu May 17, 2018 9:51 pm

What about using a NTC and an I2C ADC ? The NTC could be put on the FPGA's heatsink and connected to the board with wire ? MCP3021A0T is cheap and 10 bits should give an adequate resolution for the temperature.

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Re: RTC board

Postby Sorgelig » Fri May 18, 2018 2:52 am

What is NTC? Some thermal conductor? Post the links, please.

Frederir
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Re: RTC board

Postby Frederir » Fri May 18, 2018 6:57 am

https://en.wikipedia.org/wiki/Thermistor
NTC for 3D printer extruder can be get for really cheap :
https://www.gearbest.com/3d-printer-par ... id=1433363

Of course it must be fixed to the FPGA heatsink one way or another. Epoxy glue is easy.

F.

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Re: RTC board

Postby Sorgelig » Fri May 18, 2018 7:12 am

I know what is thermistor. Just didn't know the NTC abbreviation.
It's not more convenient than AD7415. You can glue this chip directly to heatsink. I think it's possible to move the heatsink toward the RTC board with one rib precisely trimmed so it will touch the chip from the bottom and thus provide the heatsink temperature.

But either way is for advanced users only.

warham
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Re: RTC board

Postby warham » Sat Nov 03, 2018 11:56 am

3d printed standoff for the rtc board
https://www.thingiverse.com/thing:3193029

Image

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Re: RTC board

Postby Sorgelig » Sat Nov 03, 2018 5:09 pm

warham wrote:3d printed standoff for the rtc board

May be it's better to improve it by preventing RTC board from bending up as well. With I/O board it's actual.

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Re: RTC board

Postby warham » Sun Nov 04, 2018 7:17 pm

Sorgelig wrote:
warham wrote:3d printed standoff for the rtc board

May be it's better to improve it by preventing RTC board from bending up as well. With I/O board it's actual.





something like this?
Image

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Re: RTC board

Postby Sorgelig » Sun Nov 04, 2018 7:24 pm

Yeah! looks good! supports both I/O board and RTC.

Although i've bought 3D printer some time ago, i still didn't try it. May be it's time to try :)

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SmokeMonster
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Re: RTC board

Postby SmokeMonster » Mon Nov 05, 2018 1:38 am

Great work Warham! I wrote that up for RetroRGB http://retrorgb.com/mister-3d-supports-for-io-rtc-boards.html. Should be in Wednesday's Roundup unless he's filmed already.

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Re: RTC board

Postby diggie » Tue Nov 13, 2018 4:18 am

Edit: Nevermind, just noticed hwclock command is documented for testing.

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Re: RTC board

Postby Poobah » Sat Dec 01, 2018 4:02 pm

I'm building some RTC 1.3 boards.
Debating on whether to populate the temp sensor, as it drives the board cost up significantly.

Any thoughts on when/if the sensor will supported? My thought now is NOT to populate it, so people can have a less expensive clock option.

Thanks!

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Re: RTC board

Postby Sorgelig » Sat Dec 01, 2018 4:07 pm

don't populate


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