| Summary: | 碩士 === 輔仁大學 === 電機工程學系碩士在職專班 === 104 === In this paper we use both a smartphone and a portable oxygen sensor module to detect and monitor the amount of oxygen, CO and gas concentration by means of Bluetooth communication. When the oxygen, CO and gas concentration exceeds the normal range, our portable oxygen, CO and gas concentration detection and monitor system will notify the user immediately. We use an oxygen, CO and gas sensor both to detect ambient air and to generate the relative voltage value with respect to the oxygen level. This voltage value is amplified first through an instrumentation amplifier and the input to a MCU (Micro Controller Unit). The MCU calculates and transfers the oxygen value to a percentage of data. This design is easy both to read and to ascertain how much oxygen, CO and gas concentration is present in the air. When the time interval of low oxygen or high CO and gas concentration in the environment is longer than the value setting, the smartphone will set off an alarm to remind the user in order to prevent harm to human health.
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