温度湿度センサDHT11・DHT22をArduino・ESP32・ラズパイで使う

#include "DHT.h"
#define DATA_PIN 2 // D2

DHT dht(DATA_PIN, DHT11);

void setup() {
    Serial.begin(9600);
    dht.begin();
}

void loop() {

    delay(3000);

    float humid = dht.readHumidity();
    float temp = dht.readTemperature();

    if (isnan(humid) || isnan(temp)) {
        Serial.println("Failed...");
        return;
    }
//    Serial.println(humid);
//    Serial.println(temp);

    char humidFloatString[10];
    char tempFloatString[10];
    
    dtostrf(humid,4,2,humidFloatString);
    dtostrf(temp,4,2,tempFloatString);

    char bufHumid[20];
    char bufTemp[20];

    sprintf(bufHumid, "Humidity: %s", humidFloatString);
    sprintf(bufTemp, "Temperature: %s", tempFloatString);

    Serial.println(bufHumid);
    Serial.println(bufTemp);
}

float pi = 3.14159265;
char floatString[10];
dtostrf(pi,4,2,floatString);
char buf[20];
sprintf(buf, "pi is %s", floatString);
Serial.println(buf);

dtostrf(変換する値, 小数点や符号を含んだ変換後の文字数, 小数点以下の桁数, 変換後の文字列を格納する変数)

.
├── include
│   └── README
├── lib
│   ├── DHT22
│   │   ├── DHT.cpp
│   │   ├── DHT.h
│   │   └── examples
│   │       └── demo
│   │           └── demo.ino
│   └── README
├── platformio.ini
├── src
│   └── main.cpp
└── test
    └── README

/**
 * @date 2022-11-23
 * @author Toshihiko Arai
 * @copyright https://101010.fun
*/
#include <Arduino.h>
#include <DHT.h>

/**
 * @brief DHT22  <-->  ESP32  の配線
 *        VCC    <-->  3.3V
 *        DATA   <-->  GPIO13
 *        GND    <-->  GND
*/
#define DHT_PIN 13
#define DHT_TYPE DHT22

DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
    Serial.begin(115200);
    dht.begin();
    delay(100);
}

void loop() {
    float humidity = dht.readHumidity();
    float temperature = dht.readTemperature();
    float apparentTemperature =
        dht.computeHeatIndex(temperature, humidity, false);

    Serial.print("      Humidity: ");
    Serial.println(humidity);
    Serial.print("   Temperature: ");
    Serial.println(temperature);
    Serial.print("  Compute Heat: ");
    Serial.println(apparentTemperature);
    delay(1000);  // 読み取りデータがNANにならないように十分に待つ必要があるかも
}

float apparentTemperature = dht.computeHeatIndex(temperature, humidity, false);

#include <M5StickCPlus.h>
#include "DHT.h"

#define DATA_PIN 0 // G0

DHT dht(DATA_PIN, DHT11);

void setup() {
    M5.begin();
    M5.Axp.ScreenBreath(9);
    M5.Lcd.setTextColor(BLACK);

    Serial.begin(9600);
    dht.begin();
}

void loop() {

    delay(3000);
    M5.Lcd.fillScreen(WHITE);

    float h = dht.readHumidity();
    float t = dht.readTemperature();

    if (isnan(h) || isnan(t)) {
        Serial.println("Failed...");
        return;
    }

    M5.Lcd.setCursor(5, 10);
    M5.Lcd.setTextSize(2);
    M5.Lcd.println("Humid");

    M5.Lcd.setCursor(5, 33);
    M5.Lcd.setTextSize(4);
    M5.Lcd.printf("%.1f\n", h);

    M5.Lcd.setCursor(5, 80);
    M5.Lcd.setTextSize(2);
    M5.Lcd.println("Temp");

    M5.Lcd.setCursor(5, 103);
    M5.Lcd.setTextSize(4);
    M5.Lcd.printf("%.1f\n", t);
    
}

dtoverlay=w1-gpio,gpiopin=4,pullup=y

w1_therm                7330  0
w1_gpio                 3171  0
wire                   32947  2 w1_gpio,w1_therm

$ git clone https://github.com/szazo/DHT11_Python.git

$ sudo apt-get install git

$ tree
.
|-- LICENSE.md
|-- README.md
|-- dht11
|   |-- __init__.py
|   `-- __pycache__
|       `-- __init__.cpython-37.pyc
|-- dht11-test.py
|-- example.py
`-- setup.py

2 directories, 7 files

import RPi.GPIO as GPIO
import dht11
import time
import datetime

# initialize GPIO
GPIO.setwarnings(True)
GPIO.setmode(GPIO.BCM)

# read data using pin 14
instance = dht11.DHT11(pin=14)

try:
    while True:
        result = instance.read()
        if result.is_valid():
            print("Last valid input: " + str(datetime.datetime.now()))

            print("Temperature: %-3.1f C" % result.temperature)
            print("Humidity: %-3.1f %%" % result.humidity)

        time.sleep(6)

except KeyboardInterrupt:
    print("Cleanup")
    GPIO.cleanup()

$ python3 example.py 
Last valid input: 2020-12-27 03:45:31.272394
Temperature: 24.5 C
Humidity: 47.0 %

$ sudo apt-get update
$ sudo apt-get upgrade

$ sudo apt-get install python3-dev python3-pip

$ sudo python3 -m pip install --upgrade pip setuptools wheel

$ sudo pip3 install Adafruit_DHT

import Adafruit_DHT
from time import sleep

DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 14

while True:
    humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)

    if humidity is not None and temperature is not None:
        print("Temp: {0:0.1f}C  Humidity: {1:0.1f}%".format(temperature, humidity))
        sleep(5)
    else:
        print("Failed.")

$ python3 dht22_test.py 
Temp: 19.8C  Humidity: 46.6%
Temp: 19.5C  Humidity: 46.4%
Temp: 19.5C  Humidity: 46.5%

import Adafruit_DHT
from time import sleep
import datetime

DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 14

file_path = "./dat/data.csv"
with open(file_path, mode='a+'):
    pass

def put_data(humid, temp):
    print("{} / {}".format(humid, temp))
    dt_now = datetime.datetime.now()
    # dt_today = datetime.date.today()
    count = 0
    datas = []
    
    with open(file_path, mode='r') as f:
        
        for l in f.readlines():
            l = l.replace("\n", "")
            datas.append(l)

        tmp_str = "{0:0.1f},{1:0.1f}".format(temp, humid)
        datas.append("{},{}".format(dt_now, tmp_str))
        datas = datas[max(0, len(datas)-3000):]

    with open(file_path, mode="w") as f:
        contents = ""
        for d in datas:
            contents += "{}\n".format(d)
        # print(contents)
        f.write(contents)

while True:
    humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)

    if humidity is not None and temperature is not None:
        put_data(humidity, temperature)
        sleep(60)
    else:
        print("Failed.")

$ nohup python3 logger.py &
[1] 18117

$ ps x
  PID TTY      STAT   TIME COMMAND
  319 ?        Ssl    1:09 /home/pi/oprint/bin/python3 /home/pi/oprint/bin/octoprint serve --h
  949 ?        Ss     0:00 /lib/systemd/systemd --user
  950 ?        S      0:00 (sd-pam)
  963 ?        S      0:03 sshd: pi@pts/0
  965 pts/0    Ss     0:03 -bash
18117 pts/0    S      0:01 python3 logger.py
19299 pts/0    R+     0:00 ps x

$ kill 18117

$ sudo apt-get install -y nodejs npm

$ npm -v
5.8.0

$ node -v
v10.24.0

$ npm install --save express

var express = require('express');
var app = express();

app.use(express.static('www'));

var port = 8888;
app.listen(port,function(){
    console.log("Starting with port:%d mode:%s", port, app.settings.env)
});

$ mkdir www

<!DOCTYPE html>
<html><head></head><body>
Hello world!
</body></html>

$ node app.js

$ tree
.
|-- app.js
|-- dat
|   `-- data.csv
|-- logger.py
|-- nohup.out
`-- www
    |-- dat -> /home/pi/dht22/dat
    `-- index.html

3 directories, 5 files

$ ln -s "$(pwd)/dat" www/dat

<!DOCTYPE html>
<html>
<head><title>DHT22 Logger</title></head>
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<script
  src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.2.0/chart.min.js"
  integrity="sha512-VMsZqo0ar06BMtg0tPsdgRADvl0kDHpTbugCBBrL55KmucH6hP9zWdLIWY//OTfMnzz6xWQRxQqsUFefwHuHyg=="
  crossorigin="anonymous"></script>
<script
  src="https://cdn.jsdelivr.net/npm/chartjs-adapter-date-fns@next/dist/chartjs-adapter-date-fns.bundle.min.js"></script>
<body>
    <div style="width:100%">
        <canvas id="tempChart"></canvas>
        <canvas id="humidChart"></canvas>
      </div>
<script>
var date_datas = [];
var humidity_datas = [];
var temperature_datas = [];
    
function getCSV(){
    var req = new XMLHttpRequest();
    req.open("get", "./dat/data.csv", true);
    req.send(null);	
    req.onload = function(){

        var lines = req.responseText.split("\n");
        // console.log(req.responseText);

        for(var i=0; i<lines.length; i++){
            // console.log(lines[i]);
            var arr = lines[i].split(',');
            date_datas.push(arr[0]);
            temperature_datas.push(arr[1]);
            humidity_datas.push(arr[2]);
        }
        showChart();
    }
}

getCSV();

function showChart() {
    // console.log(date_datas);
    // console.log(humidity_datas);
    // console.log(temperature_datas);

    var ctx1 = document.getElementById('tempChart');
    var ctx2 = document.getElementById('humidChart');

    var tempChart = new Chart(ctx1, {
        type: 'line',
        data: {
        labels: date_datas,
        datasets: [{
            label: '温度',
            data: temperature_datas,
            borderColor: '#f88',
        }],
        },
        options: {
        scales: {
    y: {
      min: 0,
      max: 50,
    },
  }
      },
    });
    var humidChart = new Chart(ctx2, {
        type: 'line',
        data: {
        labels: date_datas,
        datasets: [{
            label: '湿度',
            data: humidity_datas,
            borderColor: '#48f',
        }],
        },
        options: {
        scales: {
    y: {
      min: 0,
      max: 100,
    },
  }
      },
    });
}

</script>
</body>
</html>