Hi Guys. I'm also a fan of HA and very like it. Because it's simple and helpful for my life. I began with Arduino, playing with some modules (RFID, RF, BLE ...) and made some small apps (IR remote control, RC car). And then had heard of OpenHAB which is HA software. As my point of view, the software is so good and suitable for DIY, hobbyers. Based on the software I built an HA app for my home. In which I can turn on/off the light, increase/decrease the incandescent bub, getting indoor/out door temperature ... Honestly, the app make me very comfortable in the winter and especial is that my child can control electrical devices without fear of any electrical relations.
That is my experience with HA and just want to share with you.