DIY Temperature & Humidity & Smoke Detector Alarm System

The working voltage of this system is DC5V. It can measure the current temperature, humidity and smoke. It can display real-time data by the 1602 LCD and can realize the sound and light alarm when in the dangerous temperature and humidity. It is a simply and easily to operate monitoring alarm system about temperature humidity and smoke. Functions 1. When connected to the power supply, after the initializati ...

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