It is best to configure Clock Timers only in the Blocks.
solved this part thanks to all the experts who took the time to advise me. but
Now I need a little more of your valuable knowledge, I need to make a modification to the program that you are requesting, this consists of adding an emergency stop button that turns off the digital output that activates the oven (pin8) and another button to turn it on manual, these buttons must be activated at any time while the automatic control is executed through the sensor, but I get another error (arguments to< ) this time different from the previous one, here in the attachment the .ino almost completely redesigned
for this purpose, and the photo of the error, I am using the same app
codigo_tempertura_con_parada_emergencia.ino (3.9 KB)
note: if I have to make a new post for this query, please let me know