We built an eco-friendly curd-to-buttermilk converter packed with sensors, all run by an Arduino Uno. The goal? Make something sustainable and smart. Instead of new materials, we used old food-grade pipes—so there’s less waste, but everything stays clean and tough. For the actual churning, a 12V DC motor gets the job done. The relay keeps the high and low voltage parts separated, so it’s safe. The automation side is pretty clever. The ACS712 current sensor keeps an eye on the load—when it senses the curd’s turned to buttermilk, it shuts off the motor to avoid over-churning and wasting power. The LM35 temperature sensor checks that things don’t get too hot; if they do, it cuts the motor to keep everything safe. We added a 555 timer IC to make sure the machine doesn’t just run forever. And for a bit of user-friendliness, LED lights show what’s happening in real time. It’s reliable, easy on the wallet, and fits perfectly in homes or small dairies out in the country.