only the voltage of the track - i won't measure the output of the trafo because that's always OK.But on some places of the track i want to measure the current power which is available at that point
So: the answer of the Topic is NO ? smiley-sad-bluethe function and use of a power sensor like the described ACS7xx is ok, but i only wanted to know if that is possible without any "hardware" (besides resistors and diodes) like these power sensors.
You can use a voltage divider to scale 25V max down to 5V max.
You need to be precise about what you want to measure. Current, power, and voltage are all different things.
its the Voltage smiley-cool
Thx to all who wanted to help - i bought a ACS712
and you buy a....... current sensor ?