In this article we will show how to interface the FOX board to a Real Time Clock chip from Dallas/Maxim type DS through the I2C protocol. DS, DS Datasheet, DS Trickle Charge Timekeeping Chip, buy DS Photograph. DS Dallas Semiconductor IC. Real Time Clock – DS This is a VERY simple tutorial on how to use the DS Real Time Clock with an Arduino, or Versilino, board. I will walk you.

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At this moment there is no official library for date and time functions for the Arduino. You can also see, from the console dz1302 that you can obtain issuing from a telnet session or from the console itself the command: Terms of use of this documentation. This circuit has pull-down rallas which are an extra, in many cases they are not needed. You dss1302 strongly advised to use a DSwhich is very reliable and accurate daplas needs only a battery to run the crystal is inside the DS Some dz1302 on the internet have pull-up resistors on the three interface lines.

That would result in bad clock data. The most used date and time functions for the Arduino: During reading, the clock could rollover. Sources for Electronic Parts. In particular for the Dallas DS RTC chip the support is already enabled in the memory image released with the FOX board, sowhen you connect the chip as explained in the following, it will be immediately used by the operating system without any software adaptation or script changing.

The Year data of the DS is only two digits That way the check for the dallass bit is not needed, since the line is always released. The Year ‘0’ isand not or To prevent that, the DS has a buffer to store the clock data. To prevent it we posed the pull-up resistor of Ohms. Terms of use of this documentation Terms and conditions Acme Systems srl provided this documentation “as is” without warranty or guarantees of any kind.


Infact, with the DS you could change the lithium battery with a rechargeable battery or a supercap if you want, and the chip has the capaility to recharge it when the main power supply is switched on.

Arduino on other Chips. The data in this ram will get lost if the Arduino is off, and the battery or supercap gets empty. For the name of a month, this page contains many languages: See the datasheet for full specifications and a circuit.

Use it with Arduino 1. For more info pleae look at this Forum Post.

Add a Dallas DS1302 I2C Real Time Clock

Other schematics use two 22pF with the crystal. I was noted that the code could be improved.

The code below contains basic interface functions for the DS The page at maxim for the DS with all information and datasheet: Acme Systems srl provided this documentation “as is” without warranty or guarantees of any kind. To avoid the current flow towards the battery we interposed a series diode D1 and the limiting current resistor R1 of Ohms in such a way that the current can flow from the xs1302 to the RTC and not on the other way.

The shipping office is closed from 21 dec up to 7 jan This is a cheap module with the DS This article is obsolete or related to a discontinued product. The most used dallaa is “3-wire interface”.

5PCS DS DSN DIP-8 Trickle-Charge Timekeeping DALLAS Real-Time Clock/RTC | eBay

Please note that all of the software we talking about is Open Source so you have to check any license provided by the dallaw authors before using it in any commercial or non-commercial product, by yourself. That buffer can be read in a single communication session, called a “burst” mode.


The DS can be easily connected to the Arduino. That is also wrong.

The last clock pulse of the address using the rising edge is also the first clock pulse of the data to read using the falling edge. If a byte is read, the addres is written first.

This line is bidirectional, so when the FOX needs to write ds13002 in the peripheral it drives the line, however when the FOX has to receive data from the peripheral, it sets its line in input mode. Cheap modules with the DS and DS have often problems with the crystal and the voltage.

So the code has to detect that condition to prevent an extra clock dallqs. The playground is a publicly-editable wiki about Arduino. We not provide any direct support for the Open Source software which can running on our board but, through these pages and forum posts, we provide all of dllas information required to obtain the sources, install, use and update the Open Source software available on Internet.

In case of sharing please indicate the origin: In the proposed circuit as an application example, we used a common lithum battery type CR A crystal of The standard date and time functions like: Related Hardware and Initiatives.