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PM2.5空污監測器實作

回學校上線有任何問題，請提出一起討論喔！

discuss pic 2016-07-25 21:37:21
回學校上線有任何問題，請提出一起討論喔！
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discuss pic 2016-07-30 05:18:37
老師您好，回家測試之後有幾點疑問:
1.用研習附的9V電池供電一開始正常，一段時間之後就會出現逼逼聲伴隨著arduino板子上標示L的燈號閃爍，之後就不能偵測了。一開始以為是否9V電池電壓太高，不過之後使用研習附贈的降壓電路板也有相同情況出現。
2.放在房間測試，平均每天幾乎都會有PM2.5濃度飆高情形(持續亮藍燈)，拔除電源重插之後PM2.5濃度又歸零了。
3.溫溼度感測器目前測試沒有問題。
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discuss pic 2016-07-30 15:20:35
9V電壓是OK的！Arduino的外接電源是7V~12V，透過麵包板電源模組也是一樣外接7V~12V，反而是覺得9V電池電流可能不足，無法正常驅動所有元件，請接外接9V變壓器再測測看。

另外，網路上的資料有對著清淨機吹，會有感測值卡住的情形
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你說的檢測值飆高！會不會也是類似的狀況，目前有很多5/13的老師用一代感測器有同樣的問題，待大家一起來研究研究~~
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discuss pic 2016-07-31 23:03:07
這幾天，測試的結果，我把根據空污亮燈，改成前3秒是根據空污亮燈，後面17秒是根據室溫亮燈。輪流亮燈。

目前機器會有一個問題，目前我的黃色、紅色的燈都燒壞了。
請問目前我們使用的發光二極體的額定電壓是多少?
是否需要串接電阻來降壓?
另外請問如果要自己買來玩，請問有什麼門路比較方便呢?
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discuss pic 2016-08-03 07:37:59
    LED 2~3v就可以驅動，可在正極或負極串連一 220Ω（歐姆）的電阻，電阻值可以再小，這樣會比較亮，數據細節可以參考Arduino第一課：LED串流電阻的學問
    在電子材料行一定都有賣，南一電子、順發3C等。還有可承受比較大電流、比較大顆的LED，不容易燒壞，也比較亮，可以買來試試看。
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discuss pic 2016-08-03 09:32:08
3Φ LED耐壓（電壓）3v，用5v也可以，很亮但壽命短；5Φ LED耐壓5v，用3v也可以，只是稍暗！
如果學校有報廢電腦未回收，拔前面版的LED來用（5v）就可以了！
1 unlike like 0
discuss pic 2016-08-05 00:41:39
報廢電腦面版的LED，非常棒的材料來源！謝謝分享~~
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discuss pic 2016-10-06 20:33:35
請問一下盛南老師，最近我們學校的機器老是呈現紫爆的狀態，但是空氣盒子的數據又沒這麼糟糕，請問是什麼原因呢？
1 unlike like 1
discuss pic 2016-10-07 00:27:45
跟樓上一樣@@
1 unlike like 0
discuss pic 2016-10-07 16:54:05
紫爆+1,
我猜是偵測的洞口累積太多灰塵,
嘴巴用力吹一吹,
現在好多了
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