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Forum Index : Microcontroller and PC projects : RTC module
| Author | Message | ||||
| viscomjim Guru  Joined: 08/01/2014 Location: United StatesPosts: 925 |
Does anyone know if the real time clock interface mmbasic command for PCF8563 in uMite is compatible with the DS1307 or the DS3231 ChronoDot modules sold by adafruit? Thanks!!! |
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BobD Guru Joined: 07/12/2011 Location: AustraliaPosts: 935 |
It is not compatible. Check the datasheets of both devices. |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6223 |
It is not the same but all the mentioned RTC modules ate I2C and easy to talk to from MM Basic. Each RTC has its own advantages and disadvantages. If you are intending to run from 3.3V, don't use the DS1307. Jim VK7JH MMedit |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
How do you eat an I2C? 
Smoke makes things work. When the smoke gets out, it stops! |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6223 |
With chips. VK7JH MMedit |
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Lou Senior Member  Joined: 01/02/2014 Location: United StatesPosts: 229 |
Good one TassyJim. I was wondering myself, now I know. 
Lou Microcontrollers - the other white meat |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
Excellent come-back, and a double-pun! Well done! Smoke makes things work. When the smoke gets out, it stops! |
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| jpconil Newbie  Joined: 24/01/2014 Location: FrancePosts: 2 |
Hello, Here is the code I am using with a DS1307 connected to a Duinomite-Mini running MMBasic V4.4B : 'Ce programme de test marche avec un DS1307
'On lit l'heure, la date etc puis on l'affiche ' Dim Table(8) I2CEN 100,100 Do I2CRCV &h68, 0, 7, Table(1), 1, &h00 'lit les secondes, minutes, etc Secondes = ((Table(1) And &b01110000)/16)*10 + (Table(1) And &b1111) Minutes = ((Table(2) And &b01110000)/16)*10 + (Table(2) And &b1111) Heures = ((Table(3) And &b01110000)/16)*10 + (Table(3) And &b1111) Cls Print Heures; " :"; Minutes ; " :"; Secondes Pause 1000 Loop I got a module with a Lithium battery for US$1.5 on ebay. But it has an error of several seconds by day. There is another product of Maxim vith a better accuracy and the same I2C adress. Cordially |
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| viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
Hi jpconil, That code looks easier than what I thought it would be. Do you have code to set the time for the ds1307? The PCF8563 module seems to be difficult to get here in the states, unless I get it from overseas. Thanks for you for your time. |
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