I have a Sparkfun Redboard (an Arduino Uno like board based on the Atmega328P and programmed with the Arduino bootloader).

I have been trying to make an accurate clock without an RTC with an LCD screen and it's been hard.

Does the Sparkfun Redboard have built-in RTC?

  • 1
    Sparkfun Redboard is NOT Arduino Uno
    – jsotola
    Commented Dec 9, 2017 at 23:13
  • 2
    the schematic is right on the sparkfun.com website ... have you looked at it?
    – jsotola
    Commented Dec 9, 2017 at 23:15
  • 3
    @jsotola yes I have p.s. it works like an Arduino uno Commented Dec 10, 2017 at 18:37

2 Answers 2


Sparkfun Redboard and Arduino Uno do not have built-in RTC.


The new "Sparkfun Redboard Turbo" does have an RTC on pins A5 and AREF

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