Planning to add more automation to the mix.
Full suite of sensors (PH, EC/TDS, Temp, Humidity and water level - but too many analogue pins needed for the D1 Mini alone to handle, so an SPI 4 channel ADC to the rescue.
Waiting on some peristaltic pumps and will get PH control fully automated, and if that works will connect up the nutrients and a larger pump to top up from an RO water reservoir tank.
Will post some more details and pictures when I finish putting it all together.