具無線傳輸之二氧化碳感測系統設計

本研究主要是進行植物生長所需的二氧化碳即時監測系統之設計實現，此原型機之開發，運用了CC2530晶片，及兩階段無線傳輸系統，分別為RF無線發射接收模組進行二氧化碳訊號傳輸與紅外線的同步信號發射接收電路進行二氧化碳濃度的感測，前者為2.4GHz無線傳輸技術，後者利用紅外線電路設計之簡單架構，完成二氧化碳之感測。本文所使用之二氧化碳無線感測系統，是利用OGM-220中的光腔兩側的小孔使得空氣中的二氧化碳能夠透過小孔進入OGM-220中，以OGM-220的紅外光源照射光腔中的空氣，藉由二氧化碳對4.2um波長的紅外光吸收來反應出環境中二氧化碳的濃度，將所感測到二氧化碳數值經由無線傳輸模組CC2530系統即時回傳到PC上，在PC之人機介面設計，可以觀察到即時的二氧化碳濃度值，亦可觀察到指定時段內的濃度變化趨勢。

關鍵字

環境監控；植物生長；無線傳輸；二氧化碳感測

並列摘要

This research proposes a real-time plant growth carbon dioxide sensing system which uses CC2530 chip and two stages of wireless transmission systems, namely RF wireless transmitter/receiver module and an infrared carbon dioxide signal synchronization and transceiver system. The former is designed for 2.4GHz wireless transmission technology, and the infrared circuit design is simple for CO2 sensing. The CO2 sensing chamber is to provide holes on both sides of the optical cavity using OGM-220 which allows the carbon dioxide in the air to enter into the OGM-220’s reactor, the OGM-220 infrared light source with the wavelength of 4.2um can detect carbon dioxide level by reflecting the infrared light absorbing carbon dioxide concentration in the environment. Further, the sensed values of the instantaneous concentration of carbon dioxide will be transmitted via a wireless transmission module CC2530 to the PC, the human-PC interface were designed and observed for real-time CO2 concentration as well as a profile on CO2 changes in the specific time interval.