Hello, I have a Lead Acid battery 6V and I want to meter its voltage using Arduino's ADC. I want to do this with some kind of isolation between the battery and the ADC. Can this happen? What component/circuit should I use to build this?
Why do you need isolation? What isolation voltage?
A somehow good solution may be more effort and higher cost than the arduino itself.
What voltage range (of interest), signal frequency, precision, resolution? What sample rate?
Why do you need isolation? What isolation voltage?
A somehow good solution may be more effort and higher cost than the arduino itself.
What voltage range (of interest), signal frequency, precision, resolution? What sample rate?
I have a circuit with Arduino, sensors and a battery (6Volt) and I want to meter the battery's voltage using one of Arduino's ADC. But I do not thing it is a good idea to use directly connection of the battery to the ADC (even with a voltage divider), because maybe I face some short-circuits, I do not know for sure...! That's why I thought of using an isolator. As far as the resolution is concerned, Arduino provides 1024 bits, and the frequency: 1Hz is ok, and even lower...
you worry about short circuits... and why do you think you can´t create a short circuit with some isolation?
I think the more devices you use the higher is the chance for a mistake.
I think the voltage divider solution (you need in most isolated case, too) is a very simple and rugged solution.
Choose the resistor values that the current isl imited to a safe value.
It´s used million times in many devices.
How is your arduino powered? From the same battery? --> Then isolation definitely makes no sense.
BTW: There are many, many discussions and descriptions about battery voltage measurement.
Do a forum search and/or an internet search.