**[[ad_ul_data_logger|Uno-Leonardo Data Logger]]**
====== Real Time Clock DS3231 ======
===== Description =====
RTC DS3231 is connected to standard TWI (I2C) bus.
==== Used Pins ====
=== Arduino Leonardo Compatibility===
Digital Pin: **2, 3**\\
Bus: **TWI**\\
Power Pin: **GND, +5V**\\
{{:ad_ul_data_loger_1_0_0:leo_pin_twi.png?300|}}
=== Arduino Uno Compatibility===
Analogue Pin: **4,5**\\
Bus: **TWI**\\
Power Pin: **GND, +5V**\\
{{:ad_ul_data_loger_1_0_0:uno_pin_twi.png?300|}}
==== Config options ====
**SQW** (left side) is output pin on which is available square wave depends of DS3231 setings.\\
Pin header (right side with LED) in short show output on **SQW** (left side)\\
**SQW** (right side) is output pin on which is available square wave of 32kHz.\\

\\
{{:ad_ul_data_loger_1_0_0:uno_leo_mega_duo_data_loger_v1_0_0_ds3231.png|}}
==== Code example ====