[Tkinter] Anyone know what happened to my button?

[IgnacioMora23]

Basically this graphic interface is thought and designed to be able to show voltages of the sensors that are in the field and with this detect which sensor is showing a voltage value lower than the average of all the voltages that will reach my computer.

At the moment this interface will show the Date, the Time and the voltages of the first, second and third sensor, in addition to that it will show the average of these voltages and finally the lowest voltage.

I want that in the future when I go to add one or more sensors to the network, I can modify the interface so that it shows more voltage values.

The words in this interface are in Spanish. So I'm going to translate them for you.

Sistema de monitoreo de Paneles del Seslab = Seslab Panel monitoring system
Fecha de medicion = Measurement date
Hora de medicion = measurement time
Voltaje de Panel 1 = Panel Voltage 1
Voltaje de Panel 2 = Panel Voltage 2
Voltaje de Panel 3 = Panel Voltage 3
Pomedio = Average
Panel con menor voltaje = Lower voltage panel