A simple script in Go language to automatically update Digital ocean DNS records if you have a dynamic IP. Since it can be compiled on any platform, you can use it along with raspberrypi etc.

Requires Git and Go for building

git clone https://github.com/anaganisk/digitalocean-dynamic-dns-ip.git

create a file config.json and place it same directory as this script and add the following json

{
  "apikey": "samplekeydasjkdhaskjdhrwofihsamplekey",
  "domain": "example.com",
  "records": [
    {
      "name": "subdomain",
      "type": "A"
    }
  ]
}

#run
go build digitalocean-dynamic-ip.go
./digitalocean-dynamic-ip

You can either set this to run periodically with a cronjob or use your own method.

# run crontab -e
# sample cron job task 

# m h  dom mon dow   command
*/5 * * * * /home/user/digitalocean-dynamic-dns-ip/digitalocean-dynamic-ip