Arduino × 科學 - Water Temperature

水的結冰溫度實驗

Arduino主板 x 1

麵包板 x 1

DS18B20防水型溫度感測器 x 1

wifi ESP8266 x 1

步驟一：僅有溫度感測器

紅色線VCC --> arduino 5V

黑色線GND --> arduino GND

藍色線data --> arduino pin2

藍色線data --> 47KΩ的電阻(也可用兩個100KΩ的電阻並聯取代) --> arduino 5V

程式碼1 (僅有溫度感測器，數據顯在電腦上)

#include <OneWire.h>

#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature watersensor(&oneWire);

float watertemp;

void setup()

  Serial.begin(9600);

  watersensor.begin();

void loop() {

  watersensor.requestTemperatures();

  watertemp = watersensor.getTempCByIndex(0);

  Serial.print("Temperature is: ");

  Serial.print(watertemp);

  Serial.println(" *C");

  delay(100);

步驟二、溫度感測器 + WIFI模組

注意：WIFI模組要接到3.3V，以免燒壞。

程式碼2 (透過wifi上傳至ThingSpeak)

#include <OneWire.h>

#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature watersensor(&oneWire);

float watertemp;

#include <SoftwareSerial.h>

SoftwareSerial esp8266(4,5);

String apiKey = "";     // ""內輸入ThingSpeak的Write API Key

String ssid = "";       // ""內輸入wifi基地台的名稱

String password = "";   // ""內輸入wifi基地台的密碼

boolean DEBUG = true;

void showResponse(int waitTime){

    long t=millis();

    char c;

    while (t+waitTime>millis()){

      if (esp8266.available()){

        c=esp8266.read();

        if (DEBUG) Serial.print(c);

boolean thingSpeakWrite(float value1){   //自己增加或減少要上傳的數據項目

  String cmd = "AT+CIPSTART=\"TCP\",\"";

  cmd += "184.106.153.149";

  cmd += "\",80";

  esp8266.println(cmd);

  if (DEBUG) Serial.println(cmd);

  if(esp8266.find("Error")){

    if (DEBUG) Serial.println("AT+CIPSTART error");

    return false;

  String getStr = "GET /update?api_key=";

  getStr += apiKey;

  getStr +="&field1=";

  getStr += String(value1);

  getStr += "\r\n\r\n";

  cmd = "AT+CIPSEND=";

  cmd += String(getStr.length());

  esp8266.println(cmd);

  if (DEBUG)  Serial.println(cmd);

  delay(100);

  esp8266.print(getStr);

  if (DEBUG)  Serial.print(getStr);

  else{

    esp8266.println("AT+CIPCLOSE");

    if (DEBUG)   Serial.println("AT+CIPCLOSE");

    return false;

  return true;

void setup()

  Serial.begin(9600);

  Serial.println("Arduino...OK");

  esp8266.begin(115200);

  esp8266.write("AT+UART_DEF=9600,8,1,0,0\r\n");

  delay(1500);

  esp8266.begin(9600);

  Serial.println("ESP8266...OK");

  esp8266.println("AT+CWMODE=1");   // set esp8266 as client

  showResponse(1000);

  esp8266.println("AT+CWJAP=\""+ssid+"\",\""+password+"\"");

  showResponse(10000);  //顯示並等待wifi完成連線

  watersensor.begin();

void loop() {

  watersensor.requestTemperatures();

  watertemp = watersensor.getTempCByIndex(0);

  Serial.print("Temperature is: ");

  Serial.print(watertemp);

  Serial.println(" *C");

  thingSpeakWrite(watertemp);

  delay(20000);

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