LASS 感測器驗證 - Grove - Multichannel Gas Sensor
感測器：Grove - Multichannel Gas Sensor
Verification Code: github
Wiki : Basic features, Sample code, Schematic/Layout
Datasheet
初體驗
- 將 Grove 接上 LinkItONE I2C grove 接頭。程式執行結果
- 沒有 DoCalibrate
The concentration of NH3 is 0.99 ppm
The concentration of CO is 4.39 ppm
The concentration of NO2 is 0.15 ppm
The concentration of C3H8 is 1000.04 ppm
The concentration of C4H10 is 999.98 ppm
The concentration of CH4 is 2991.14 ppm
The concentration of H2 is 1.09 ppm
The concentration of C2H50H is 1.62 ppm
- 有 DoCalibrate
- The concentration of NH3 is 0.99 ppm
- The concentration of CO is 5.74 ppm
- The concentration of NO2 is 0.13 ppm
- The concentration of C3H8 is 1000.04 ppm
- The concentration of C4H10 is 999.98 ppm
- The concentration of CH4 is 2991.14 ppm
- The concentration of H2 is 1.10 ppm
- The concentration of C2H50H is 2.31 ppm
- 不知道結果的正確性，先檢查穩定度與變異量
- 開機量測 15 分鐘，紀錄結果
- 每分鐘量，量了近20分鐘，原始資料
簡單整理一下資料
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- 開機量測 15 分鐘，並於第五分鐘點檀香，觀察點香前後的差別
Extract script
cat multi-gas.txt | grep 'CSV' | grep -v 'NH3'
Q&A
Q1 : 如何得知一般環境正常值範圍，好做初步的檢查？
在不同情境下，得知應該有的值域，目的是檢查是否感測器有問題，或是 Code 寫錯。值域最好有範圍，以及一般值，或是平均值
情境說明：
- 一般室內：指的是一般室內，通風良好，沒有特殊外在干預（比方說，點香，清淨機，煮菜等）
- 可參考 空氣污染指標的定義
- NH3印象中一般大約在幾十個ppb (0.2~3ppm）以下
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