Hi Réna

That's great!  Thank you for getting back to me

Best wishes

Luke

Hi all

Im hoping someone can direct me to the led datasheet for the leds used on the led Matrix display?  I'm making my own charlieplexed pcb and would like to find similar leds to those used on this board. 

Many thanks

Luke

Hi Laveréna

Thank you for your very informative and quick response!

That's brilliant you've helped confirm my suspicions and hopefully I won't have too many issues with the I2C connectivity.  I have set the clock to the same time as my computer and it keeps very accurate time (+/- 1 sec a day) (it's been running from last night to tonight and no issues whatsoever!). 

Thank you once again, I'll post the final project on here once done 

Best wishes

Luke 

Hi all

This is my first post so please be kind!  I'm completely new to programming but trying my best to learn

Apologies if this is in the wrong section, I'll move the post if an admin can advise.

I'm currently designing a watch using the TinyDuino LED Matrix and the 1339 RTC module connected via I2C.  In short I'm concerned with the reliability of I2C (purely due to seeing other posts on various forums claiming lost data packets etc.) which has set my paranoia going!

I am using the wire.h library, in combination with the DSRTCLib.h RTC library.  I have programmed my board and it works really well (much better then I expected in fact).  However it concerns me that if the I2C does lose communication or data packets somewhere down the line I'm not going to know.  I've read up on I2C and have a reasonable grasp of it's functioning but I'm by no means an expert in it's operation. 

I suppose what I'm looking for is some way of knowing that the I2C has successfully transmitted all data packets so the time displayed on the LED Matrix is accurate. 

In addition if the I2C did suddenly lose connection mid way through sending data what would the 328P processor do?  does it simply hang waiting for the ACK and the STOP command or does it just take whatever data it has received and assume the rest is value 0 and ends communication?

Sorry for the long post, I'm really close to finishing my project but I'm concerned that I'll never know if the time displayed on my watch is accurate - obviously a pretty important thing for a watch!

Many thanks

Luke