So here is the question in short.
Im using a arduino uno and have analog readings filtered to 0 to 50, i want to convert those values to 50 to 0 insted.
This is probably realy simple but my head is blank.
more detailed description is that i want to take the distance reading and make a speaker bep more frequently the closer the robot comes to something, brings back old videogame memmories.
A spekar is hooked up to digitalpin 3 and i have some code that beeps but i get stuck at making the beeps more frequent and not longer...