SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-29T07:10:28-06:00SparkFun ElectronicsRisen on Enginursday: Battle of the RTCRisenurn:uuid:5667db8b-1f7b-d314-d1bb-bca152ba0e212016-10-11T11:22:30-06:00<p>The 1307 that I put into a standalone clock project loses a couple minutes per month. It's a little annoying to have to adjust it that frequently.</p>
John Morris on Enginursday: Battle of the RTCJohn Morrisurn:uuid:388a9ab2-3c9f-9a15-e574-1eef440f96f62016-10-07T13:41:18-06:00<p>Hoping somebody else noticed that detail. NVRAM is so much easier to work with compared to eeprom. No write limits means you can just block read the thing on boot right into your variables and occasionally (meaning add a call to any of the routines that would change them) just dump the entire block back to the clock. No worries about wear leveling. I like easy.</p>
Maine Solder Guy on Enginursday: Battle of the RTCMaine Solder Guyurn:uuid:74e95e8f-ea67-c437-8c91-5ccb912a6cf02016-10-07T08:39:36-06:00<p>The DS3231 can use the 1307 libraries. I'm not sure that you extract all functionality, but my uses have been fairly simple and I don't need all bells and whistles. My major interest was the temperature controlled oscillator and high accuracy.</p>
Sembazuru on Enginursday: Battle of the RTCSembazuruurn:uuid:f486d509-6e1a-6dbe-8e05-61713543e5b82016-10-06T14:29:03-06:00<p>Too bad the chronodot doesn't use the DS3232SN... That is I2C like the DS3231SN, but includes NV SRAM (but only 236 bytes instead of the 256 bytes of the DS3234).<p>But, maybe that is an opportunity for SparkFun. A refresh of the DeadOn RTC:</p><ul>
<li>Upgrade the current version to the ...SN variant and add the RESET and 32khz breakout pins.</li>
<li>Make a new breakout board for an I2C DeadOn using the DS3232SN.</li>
</ul><p>That would give customers the option of I2C or SPI without loosing the accuracy and existence of on-board memory.</p><p>Also, Adafruit's breakout and feather wing board only uses the ...S variant, not the ...SN variant. The ...S variant isn't rated for accuracy below freezing.</p></p>
TheEngineerFormelyKnownAsCaseyTheRobot on Enginursday: Battle of the RTCTheEngineerFormelyKnownAsCaseyTheRoboturn:uuid:c460ebcd-8c60-6ff5-736a-afca411a445f2016-10-06T13:24:36-06:00<p>I see an opportunity for you to bring something to the community :) Fork the repo and get after it!</p>
JPerch on Enginursday: Battle of the RTCJPerchurn:uuid:d6a2d1a1-e801-9eb8-2317-b52acba05a1c2016-10-06T13:15:35-06:00<p>Yes, the Chronodot uses this device (that is how I knew about it). Adafruit does sell the Chronodot (I have bought a couple of them). They have also created their own breakout board for this device as well as a feather board.<p>Joe</p></p>
Sembazuru on Enginursday: Battle of the RTCSembazuruurn:uuid:b9c129dd-cf91-3197-00c3-0f84cd5b3dac2016-10-06T12:56:45-06:00<p>The Chronodot uses the DS3231N (this is the industrial version that is tested to work below freezing). The versions that I've used have solder locations for I2C pullup resistors, but leave it up to you to decide if you need them or not. I think you can get the Chronodot over at EvilMadScientist and/or AdaFruit. Maybe other places. Creative searching might find DS3231 based breakouts less expensive than the chronodot, but you won't get the cute round PWB. ;-)<p>Watch out, though. The DS3231 doesn't have NVRAM, so if you plan on using the storage (for example, storing daylight savings time rules/settings) then you are out of luck.</p></p>
xsk8rat on Enginursday: Battle of the RTCxsk8raturn:uuid:73239c4c-0a1e-79d2-919e-3b9f674c1de82016-10-06T10:35:41-06:00<p>Thank you for creating the Hookup Guides and updating the libraries. I live and die by those things!<p>Cheers!</p></p>
JPerch on Enginursday: Battle of the RTCJPerchurn:uuid:166d406f-c61e-aad5-4339-da1c9eb3d4652016-10-06T10:26:52-06:00<p>If you are in need of the higher accuracy of the DS3234 but pin limited such that you want the I2C bus, you could use the DS3231 also from Maxim. It appears to be essentially the same chip but with an I2C interface instead of SPI. The register set even appears to be the same.<p>https://www.maximintegrated.com/en/products/digital/real-time-clocks/DS3231.html</p><p>Joe</p><p>Edit: Just noticed the two parts have a different number of pins and a different pinout. So the DS3231 would require its own breakout board.</p></p>