Arduino - DS1307 RTC 

+Linus Miranda Hey there thank you very much for the wonderful comment. I am very glad that it was able to help you. It is viewers like you that keeps me inspired to keep making more videos. Thanks again for your comment.

Hey there, I am very glad to hear that this was helpful for you. Thanks for the great comment. Cheers.

Hey there thank you for your comment. I am glad part of it was helpful to you.

Hey there thanks for the comment. I am glad you enjoyed this video. To answer your question about the nvram on the ds1307 if you open up the RTClib.h file you will see the functions for calling the nvram. I have listed them below. This should help you access these. void readnvram(uint8_t* buf, uint8_t size, uint8_t address); void writenvram(uint8_t address, uint8_t data); void writenvram(uint8_t address, uint8_t* buf, uint8_t size);

Hey there, Thanks for the great comment. I am glad you enjoyed the video.

yes you could. you would just use the now.minute, now.hour, and now.sec function calls I believe and just check for the hour, min, and maybe second that you are wanting to wait for and turn on/off led's accordingly.

Hey there, thanks for the comment. If it is just picking up where it left off I would check your battery connections. Also I would make sure that in your code you are not saving the current time and re initializing the RTC with that time uppon boot. I did that and didn't notice it and my clock would start from the same time regardless what actual time it was and I noticed that I was putting the initial time set in every time it booted. Once you set the time, as long as you have the battery connected, it should never need to be set again, unless you need to change it for other reasons. Hope this helps.

misperry thanks much, that's very helpful. It's working fine now. Just like u said, i did initialize the time again on every boot. I'm making a RTC switch for my dad to water his orchid garden, twice a day. thanks again.

Cool. I am glad you got it working. An orchid garden watering system that sounds great! Have you checked out the automated sprinkler system? I have a vegetable garden and I thought this up one day while watering. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-S7TrhZua1dw.html

Hey there, thanks for the comment. You can use this module with a pic micro or arm processor as well. I was thinking of making other videos using those two platforms as well to show how to make your own DS1307 library.

Hey there thanks for the comment. Unfortunately no you cannot connect the RTC to any other pins than the A4 & A5. The reason is because no other pins access the I2C hardware inside the Atmel chip that the arduino uses. Thus, you have to use A4 & A5 for I2C communication.

Thank you

Only chips architecturally similar to the ds1307. Other RTC's may have different command structures and different ways of accessing them. You will have to look at the data sheet to see how they are accessed.

+Yuann Wang Hmm First check your hardware connections and ensure you are not using too big of a pull up resistor.

You totally could. You would just have to add them to the code so you would be always scanning to see if one is pressed and then upon pressing one you perform the action. Or you could wait for one to be pressed for a period of time then do whatever.

Hey there, thanks for the comment. I am glad that you enjoyed the video.

Yes that is the DS1307 RTC clock IC. That is whats keeping the time.

@@misperry thank u sir .

No it only took as long as soldering the components and programming. The code is located on my project code link that is on my channel's home page.

Hey there, Thanks for the comment and the suggestion. This looks like a good idea to me. I am glad that you enjoyed the video and keep watching I may have to check out one of those SURE Electronics 32x16 matrix screens. Thanks again.

Hey there, thanks for the comment. make sure that your monitor window at the lower right corner is set to 57600 and that in your code you set the 57600 baud as well using the Serial.begin(57600)

I have done everything right as per your video. I am facing two problems: 1. First of all, the compiler says no function of the form DateTime found, had to change the syntax i.e. i had the define the time before the date, after that was resolved , i still got garbage values in the Serial Monitor. 2. Second of all i copied your code exactly and then uploaded it but then then serial monitor stopped displaying anything! I also wanted to ask you that, Do we have to change settings in the control panel, i.e. to change the bits per second in the device manager properties from the default 9600 to 57600

As long as you have the coin cell 3V battery in...yes it will keep running.

Well this will activate the sensor once a minute whenever the seconds equal 2. If you are wanting it to be every 2 seconds you will need to take into consideration multiples of 2. Also if you are wanting to do every 2 seconds waiting 3 seconds after performing the action will throw you off. Hope this helps.

Hey there, thanks for the comment. Yes you are correct. As long as you have a battery you only need to set the clock with the rtc.adjust command only once. What I usually do is put a button or something on a digital port and code the arduino to where when the button is pressed at power up it goes into the rtc.adjust and resets the clock otherwise skip the rtc.adjust and continue with the current time that has been kept. Hope this helps.

Hey, thank You for the reply. That's really clever idea with the button pressed. But when I remove rtc.adjust command and remove the power or reset the arduino, I am getting strange readings, like Year 2106 :( Does that mean my battery is gone in RTC module perhaps? ATM I can't read its voltage, because battery in my multimeter is gone too :)

RoSi4You Hey there. Yeah checking with a good fresh battery would be a good idea. However, you could, if you have one available, use a power supply and set it for 3V to simulate a coin cell battery and connect that to the BATT input. Also ensure that the polarity you are connecting the battery up to the RTC is correct as well. Trust me I have put many a battery in backwards in my life time lol. Hope this is helpful and good luck.

Hm, battery on module is soldered, so bought one for my multimeter, measured it and I am reading 3.27V on it :/ So probably error is coming from somewhere else.

RoSi4You Hmmm yeah it sounds like it. Check your connections and be sure you have connected the bat to the correct places on the chip and with the right polarity. Also if you are using a bread board be sure that the bread board sockets are not loose. I have chased problems in the past the resulted in the breadboard not making contact with a wire I plugged in because the contact inside the bread board was bent out from a large diode's lead spreading it too far. Check things like this. good luck

Yes that should work fine. The library, I beleive, is universal. Good question.

Yes, if you go to the example code once you download the library, the first example has days of week printing.

Andraž Zupan I am not sure since I have not tested it on that device. You can check it out.

+fikadu shewit gidey Hey there, thanks for the comment. Yeah I will have to do a video on how to use the arduino and an LCD. Good Idea.

Manish Singh Check out how to configure a software UART. You will use what is called the bit-bang approach to make a virtual UART on the arduino that will have one baud rate and then you will use the hardware UART at a different baud to do the other. Hope this helps.

TIfail L Hmmm I am not sure why it is doing that. did you set 24hr clock or 12hr?

Trần Trung Hey there, I believe it is the weekday() function i.e. now.weekday(). It looks like the software library may have been updated since I made this video so you can check it out on this page: playground.arduino.cc/code/time

misperry i tried. Error: 'class DateTime' has no member named 'weekday'.

Hmm, well I was looking at the latest code for that library. You could always look at the source for the library and see if there is anything available for the week day. If not you could either see if there is an updated library at raspberrypi.org or you can check out the data sheet for the ds1307 and make your own function to read the register that has that information. I know the ds1307 hardware supports this feature. Take care

+Yixingsmoo Aeri Hey there thanks for the comment. What exact time were you needing? Are you wanting to know how to set it up to perform a task at a specific time and date?

I needed it turn on every 7:30am and stay on for 10mins and then off and it will turn again at 4:00pm and stay on for 10mins also then off. I want to make it happen everyday. Is this possible using DS1307? If you can help me in coding, I'll appreciate it very much. Thanks. :)

+misperry I needed it turn on every 7:30am and stay on for 10mins and then off and it will turn again at 4:00pm and stay on for 10mins also then off. I want to make it happen everyday. Is this possible using DS1307? And by the way, I just wanna ask if it is okay if we dont use LCD in this? Hope you'll response sir. Thanks! =)

+Yixingsmoo Aeri in my example you can use the now.hour() and there is a day of the week function that will return the day of the week. There is a bunch of information in the link in the description. I have included that here. github.com/adafruit/RTClib Also I could give you some sample code but it will take a while since I am very busy. Hope this helps.

+karar sabih You will have to install the RTClib.h file into your arduino directory since it is a header file. Here is the adafruit link on how to do so. learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit/arduino-library

+misperry I've installed it but i had the same problem.......!!

+karar sabih Make sure you are calling it with quotes like "RTClib.h" and not like this check at 9:00 in vid

check your wiring and ensure that everything is connected properly. Ensure the crystal for the clock is connected.

Try the debugging section of this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-drU3dQa-8CE.html

He there, thanks for your comment. I would check your hardware connections. Ensure that you are using the proper resistance value on your I2C lines. This will cause some very strange data to come out if you have the wrong resistances. Also ensure that you have the correct baud rate. I have set mine to 57600 in this example. If you need to post your sketch and I can take a look at it. Hope this helps.

This may not apply to your problem. But when I connected the 3231 RTC board I accidentally reversed the SCL/SDA lines. For reference on an Arduino UNO (I'm running an R3) analog pin A5 should connect to SCL and A4 to SDA. Does that fix your problem?

Hey there, thanks for your comment. Yes but it is not due to the device since the device has a temp range fo -40C to 85C. Where the error comes in is with the crystal selection. Depending on the temp drift of the crystal and the capacitive trimming of it will effect your clock's accuracy. So if you need a wide temp range then you need to be very selective of your crystal that you will use to get the maximum precision out of the clock. For selecting the crystal you can refer to maxim's application note 58 located below. www.maximintegrated.com/app-notes/index.mvp/id/58

Maher Marwen Hey there, sure I have a video doing exactly that it is called the automated sprinkler. Give it a look: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-S7TrhZua1dw.html

misperry thank you very much i really appreciate your help but it doesn't compile at the end of the code .. PS: i use a carte of Arduino UNO