tap screen max

[yayayaya]

Hello everybody.
I bought a 4 "rugged phone with 2000mah battery to use instead of Garmin, but the battery may run out soon.
Is there a customization or an app that dims the screen and returns to 100% by touching the screen? Kind of like with my Edge 800.
with locus I can put a widget that connected to an app reduces the brightness or brings it back to the maximum to optimize the battery
thank you