I was frustrated with the friction of setting up solar powered sensors and having to deal with multiple modules for simple projects. So instead, I designed and built my own ESP32 board equipped with the features that I wanted most all in a tight form factor. Efficient solar charging that didn't require lots of ICs (to keep the board's size small) was at the top of the priority. Since most of my sensors are apart of my home assistant server, a variety of smart home protocols was also a feature I wanted, which is why I based the design off of the ESP32 C6 that includes Zigbee and Thread.