Way too expensive. I built the same thing for well under $10 each with an esp8266 and the same conductivity sensor. Literally got dozens of each for less than $

Way too expensive. I built the same thing for well under $10 each with an esp8266 and the same conductivity sensor. Literally got dozens of each for less than $100 on alibaba. The software is like 20 lines of lua on the board and 3 lines of php on a home server. I have one of those dopey TI boards I got for free from AT&T at a meetup, pretty shit for $30 tbh.