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Source: pimylifeup.com
connect the DS3231 or PCF8523 module
1. VCC/VIN connects to Pin 1
2. SDA connects to Pin 3
3. SCL connects to Pin 5
4. GND connects to Pin 6
raspberrypi.com
```
sudo raspi-config
```
1. Interfacing Options
2. I2C
3. Yes
```
sudo reboot
```

for testing

sudo apt install python-smbus i2c-tools

sudo i2cdetect -y 1

ID #68 have to appear, later it changed to UU

sudo nano /boot/config.txt

for DS3231 add to file

dtoverlay=i2c-rtc,ds3231

sudo reboot

sudo apt -y remove fake-hwclock
sudo update-rc.d -f fake-hwclock remove

sudo nano /lib/udev/hwclock-set

find

if [ -e /run/systemd/system ] ; then
    exit 0
fi

change to (comments with #)

#if [ -e /run/systemd/system ] ; then
#    exit 0
#fi

test with

sudo hwclock -D -r