Best way to detect disconnected battery Hi! I'm new in this forum, and my english is not the best, but I will try to explain myself.
I'm charging Lead-Acid batteries with a transformer, and a bridge rectifier. If there was no battery, the signal will be a pulsating signal, but because the battery has a internal resistance, and ESR, it's quite flatted ( if it's looked in an oscilloscope, you see a DC voltage, with the upper part of the pulsating signal wich is greater than the battery voltage ). Currently, I have a voltage divider, with some 0.1% tolerance resistors. Is there a better way to do this? In the code, the ADC input is filtered with an equivalent of a RC low pass filter ( Input signal 50hz ), and then with an average code. Again, is there a better way to make this? Finally, I have to detect when the battery reaches a setpoint voltage, this is easy, but I also have to detect when the battery is disconnected, may seem simple, but when the battery is disconnected, the transformer has no load, and the measured vo
