I have a project in which I use 8 leds, a temperature sensor, and a fire alarm (made by a thermistor, buzzer and led).
I have to use all of that in just a project file. I currently have the temperature sensor and fire alarm working together , but without the bluetooth and smartphone control, only "locally". I also have a scratch on the MIT App Inventor 2 of the led parts(ON and OFF). But I don't know how to make them work together. I really don't know how I can make the fire alarm part on the MIT App, because the Arduino is supposed to send a warning of when the fire alarm is activated (buzzer sounding and led blinking). Best regards! I made it in Portuguese, any questions just ask.