Hey guys,i am building a battery monitoring system for my solarsystem.I would like to measure the voltage of the solar cell and the battery. Problem is, the charger got common positive. That means, i can't just build an voltage divider, connect minus to gnd and the V1's to the analog inputs without blowing stuff...Is there a cheap and or easy method to measure voltage galvanic isolated?Specs: 0-25V with an Error of less then 0,2 V if possible.My ideas:Use another arduino and let them communicate via IR. This is my least favored optionUse a linear optocopler. unfortunately the linear optocoplers i found are linear in a range of 0,25 V so i can just see if the voltage is up or below a point, what too less resolution for me.any other ideas?greeetings X-Ray
Ah now i get what you mean. Thank you very much, i think this will work!Here is the "Schematic" of the final System (With all features) just in Case somebody got a simmilar Problem, this might help. The red is the Voltage Sensoring from Wawa.