ok thanks very much I will do my homework If I have any questions I will definitely ask.......... I asume you have used this device before have you had any weird problems worth mentioning
ok, after doing some reading it seems the chronodots work well with digital clocks or LCD screens but will it work with a analog clock as posted in the pic I dont seem to find much info on using an anolg clock with these devices
hello again do I need the pull up resistors when connecting to uno R3 I just got the chronodot and am going to see if this works
Quote from: bigbuck83 on Aug 30, 2013, 02:34 pmhello again do I need the pull up resistors when connecting to uno R3 I just got the chronodot and am going to see if this worksYes. The Chronodot has locations where they can be installed, or they can be placed elsewhere on the I2C bus. Anything between 2.2K and 10K should work. Actually it may work without them, as the Wire library enables the internal AVR pullups, but they are technically a little weak for I2C, so I always use external pullups.
Good advice. However I have tested at least three different I2C RTC chip types and all three worked fine using just the internal weak pull-ups the Wire library provides and uses. One RTC module I had used jumper clips to enable or disable on board I2C pull-up resistors mounted on the module (I forget their resistance values), and the arduino/RTC setup would work with or without the resistor jumper clips installed or not. This module was wired on to a proto-shield board so there was short runs to the two I2C signals being used, if one was wiring the RTC some longer distance between the arduino and RTC then the weak pull-ups might cause problems. Lefty
well I can say that it is working without the resistors but i will be adding them as a precaution anyway thanks for the replys and help I will explain this project when I am finished I think y'all would enjoy what I have done here..............
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