Yes, as mentioned, clean up your void loop() that concentracion() function is trying to run thousands of times a second and while the delay may slow things down, it is also hampering Blynk’s ability to stay online… use timers as shown.
void loop()
concentracion()
http://help.blynk.cc/getting-started-library-auth-token-code-examples/blynk-basics/keep-your-void-loop-clean
I also fixed your code formatting when pasting in this forum…
