I need some assistance with a running a RTC and a NFC sheild
NFC
http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=90_93&products_id=2205
RTC
I can use the with out a problem independently but as they both use SCL and SDA any ideas how to fix it
?
It looks like the RTC has two SDA and SCL connections.
Can you go Arduino SDA/SCL > RTC1-SDA/SCL > RTC2-SDA/SCL > NFC?
yer i though i may be a pass through but for some reason it did not seem to work i may have been a user issue i will check it out and let you know.
thanks
Nath
I frequently have user issues.
tried that with no luck, the NFC does not connect if the RTC is in front of it
I'm reading this:
"I2C allows you to have multiple devices connected to the same two lines (collectively called a bus)"
which is suggesting to me you can have both the RTC and the NFC connected to 4 and 5 on an Uno and the controller will sort it out.
Look here:
http://www.robot-electronics.co.uk/acatalog/I2C_Tutorial.html
TIL.
i think you are correct it looks like i must have had a wiring issue..
no just need to sort out why my rtc does not want to keep the time.
Thanks for all your help 