hi i am new to electronic project designing i require assistance..
in my project i have to monitor the level of high power battery supply of the range 72v...(i.e)arduino takes the voltage level as input..my question can i use a comparator with a relay circuit so that my digital input pin becomes high if the voltage level falls below 67V.
also suggest some suitable voltage comparator n relay
Not that it really matters but define "high power" battery?
If you are using an Arduino then you need a voltage divider (Google it) to reduce your 75VDC to 5VDC, then this gets connected to an Analogue input.
then you just need to look at reading an analogue input, scaling or mapping to make some sense of the result and a comparison code to set the output high when voltage = preset value.
All quite simple and easy to discover by searching Google, the forums and the Learning/Reference pages.