/diy/ - Do It Yourself

>>1478778
Even measurements with wire need to be in AC as DC would polarize salts in the water and the measurement would be useless. Metal is hard because there is corrosion and build-up of stuff than can corrupt data. Inductive sensing of conductivity is based on the fact that the induced voltage on the secondary coild relates to the magnetic permeability of the water (which has a thin connection to connectivity due to dilluted salts); in using another calibrated sensor or a solution of known conductance you can calibrate the thing to give you a nice mS/cm result. I`ll also need to make a turbidity sensor, a temperature and humidity. The last ones can be bought for cheap but conductivity and turbidity will need to be DIY. Also I`ll have to code something to record the data on a SDcard and that will last a couple months on two AAs floating on a lake. I can do that, but building transducers is new to me. I`ll look in ali to see if there is anything.