When two or more than two types of detectors (replace) with push button switch signal fire detection and alarm system to produce alarm control signals, based on the Arduino platform, use different color button switch instead of smoke, temperature and ultraviolet light are three kinds of sensor, using the bread board, LED, buzzer, resistance of components such as building fire alarm system,

Could you tell me the code should be how do ah

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A signal when judging the other two signals have had happened?

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(A& & B) | | (B& & C) | | (A& & C)
To understand!

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Smoke alarm demo video: https://player.youku.com/embed/XNDU3MTcxNzM5Ng==

Thank you, oliver! Draw lessons from the thinking of you, we open source code (hardware + software) design the LoRa smoke smoke alarm, fire intelligent judgment, based on LoRa transmits to the server and App, as well as the sound and light alarm, and remote networking alarm, please link: https://www.cnblogs.com/rimelink/archive/2020/03/03/12400338.html