| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 107 === This study presents a wireless carbon monoxide sensing system which is applied to the Internet of Things (IOT) system. By designing the APP, it can remotely monitor the carbon monoxide concentration in the room and use the self-made smart socket to control it instantly. The wireless carbon monoxide sensing system is based on the NodeMCU control board, and uses ESP-12E Wi-Fi module as the wireless communication device. Fabrication of the CO sensors uses the CMOS (complementary metal oxide semiconductor)-MEMS (micro electromechanical system) technology. Furthermore, the printed circuit board (PCB) is made to integrate the electronic components and circuit in the system. The APP was designed by App Inventor 2. When user opens the APP and connects to the internet, this APP can monitor the indoor carbon monoxide concentration directly. The smart socket is made by a control board and a printed circuit board. The electronic components such as relays are integrated. And the data is read into the controller from the cloud server, and the program decides the switch of the socket. The sensor is made by the 0.35µm standard CMOS process of TSMC, and its structure includes interdigital electrode, thermometer and a CO gas sensing film. Nanotube-CoOOH is prepared by using the hydrothermal method to adopt on the sensing film. The gas sensor, which is a resistive type sensor, the resistance will change when the sensing film adsorbs CO gas. Compiling the program of the NodeMCU with Arduino IDE software makes the system which has the function of reading the CO sensor signal and uploading data to the cloud server. After the experiment, carbon monoxide monitoring can be carried out within 90 meters of the space, and the concentration measuring range is 10 to 100 ppm.
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