Hi,
I'm following a tutorial to make a "Clock-Clock" with 48 servos hooked to 3 PCA9685. These use my SDA and SCL pins on the Uno. So, I'm wondering how to hook up the RTC ? Which pins should I use.
The tutorial indicates these connections for the RTC:RST to D4, DAT to D3, CLK to D2 of a Nano. But I'm using an UNO and my RTC has different labeled pins: GND,VCC,SDA,SCL,SQW,32K.
Appreciate your help, thanks.
You should mention what RTC you have.
I2C is a bus. So you can add multiple I2C devices to the same SCL/SDA pins.
That is not a DS1302.
So exactly what do you have?
If your module does actually have I2C then it will not work with the code from the tutorial.
@jim-p The photo shows what I have. Bought from Ebay whic says DS1302. But I guess it's wrong, cheked other sites it seems to be DS3231. here's the one from the tutorial:
multiple I2C ? but the have to be addressable ?
OK if it is DS3231 do you know how to modify the code to make it worK?
I rather just buy one same as the one in the tutorial. Can I use the same pins with UNO which he uses with Nano ?
Yes, they are. Each device basically has its own address. For the RTC module that you show in post #3 it will have two; one for the RTC (fixed) and one for the EEPROM (which can be modified using the A0/A1/A2 pads on the board).
The PCA96856's address can also be modified.
Yes same pins
Thank you for your help
No problem
Have a nice day!
You too
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