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「pm2.5空氣品質感測器製作研習」目錄
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5-2 修改電路1_改成較穩定的電路
1. 製作前的準備
2. 空氣污染指標定義
3. 電路實作
3-1 四 LED 空氣汙染等級顯示
3-2 警告蜂鳴器
3-3 DTH22 溫溼度感應器
3-4 ESP8266 WiFi 模組
3-5 二路 繼電器
3-6 Sharp 空污傳感器 (GP2Y1051 二代)
3-7 裝入外殼，設備固定
4. 程式編撰上傳
4-1 修改sample程式
4-2 上傳Arduino
4-3 回校安裝步驟
5. 備註
5-1 ESP8266燒錄救星(必看)
5-2 修改電路1_改成較穩定的電路
5-3 修改電路2_增加DHT22溫濕度感測
5-4 修改電路3_加裝4個LED標示燈
5-5 修改新程式，上傳Arduino
5-4 修改電路3_加裝4個LED標示燈
pm2.5空氣品質感測器製作研習 ================ 需要材料： DHT22溫濕度感測器 \* 1 10k OM 電阻 \* 1 長杜邦線 \* 1 (資料傳輸 黃線) 麵包板跳線 \* 1 (電源 紅線) ps：DHT22電源 接地先不接！再下一步驟會跟LED燈一起接。  DHT22的程式庫需另外下載安裝，請在Arduino IDE程式的\[草稿碼\]→\[匯入程式庫\]→\[管理程式庫...\]  搜尋DHT22，\[選擇版本\] 點選最新版本，按 \[安裝\]  測試程式  修改程式： <span style="color:#FF0000;">\#define DHTPIN 7 // 研習使用Arduino Digital 7，請修改為7</span>  程式庫提供的範例 DHTtester ``` <pre class="brush:cpp;"> // Example testing sketch for various DHT humidity/temperature sensors // Written by ladyada, public domain #include "DHT.h" #define DHTPIN 7 // 研習使用Arduino Digital 7，請修改為7 // Uncomment whatever type you're using! //#define DHTTYPE DHT11 // DHT 11 #define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321 //#define DHTTYPE DHT21 // DHT 21 (AM2301) // Connect pin 1 (on the left) of the sensor to +5V // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1 // to 3.3V instead of 5V! // Connect pin 2 of the sensor to whatever your DHTPIN is // Connect pin 4 (on the right) of the sensor to GROUND // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor // Initialize DHT sensor. // Note that older versions of this library took an optional third parameter to // tweak the timings for faster processors. This parameter is no longer needed // as the current DHT reading algorithm adjusts itself to work on faster procs. DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(9600); Serial.println("DHTxx test!"); dht.begin(); } void loop() { // Wait a few seconds between measurements. delay(2000); // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius (the default) float t = dht.readTemperature(); // Read temperature as Fahrenheit (isFahrenheit = true) float f = dht.readTemperature(true); // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println("Failed to read from DHT sensor!"); return; } // Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Compute heat index in Celsius (isFahreheit = false) float hic = dht.computeHeatIndex(t, h, false); Serial.print("Humidity: "); Serial.print(h); Serial.print(" %\t"); Serial.print("Temperature: "); Serial.print(t); Serial.print(" *C "); Serial.print(f); Serial.print(" *F\t"); Serial.print("Heat index: "); Serial.print(hic); Serial.print(" *C "); Serial.print(hif); Serial.println(" *F"); } ```
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5-2 修改電路1_改成較穩定的電路
