Wow! Chuffed that I inspired you to do this on your Raspberry Pi. I'm not exactly sure what my model is, but it's one of the early ones. It's quite slow and since that post I have moved most things to a private VPS with a bit more grunt. I've also created a master account which holds active/posting authorities so I don't have to keep adding keys to my script. You can either schedule your script via cron or use pm2 (with setInterval()). I choose the latter because it has way more features and can auto log console.log() commands to a file. There's also a pm2 service called logrotate which can manage the log file sizes automatically (as Raspberry Pi storage is limited).

What are the odds of two organists in separate parts of the world, both using a Raspberry Pi and NodeJS and being on Steem? Haha!