I want to build a TDS meter to show its value on LCD screen on my DIY RO purifier, So i found the arduino can do that but i dont know which sensors to use and how to connect, can someone help me.
After a long research and executions by collecting all the sensors and working codes, I made a TDS sensor for my RO purifier using ESP8266 and monitoring over blynk server. I am sharing the references which helped me, so others can use them. I built the diy Purifier from a YouTube video.
Circuit diagram and code: