One More Arduino Weather Station (ESP-01 & BMP280 & DHT11 & OneWire)

Here you can find one iteration of using OneWire with the very few pins of an ESP-01.
The device created in this instructable connects to the Wifi network of your choice
(you must have the credentials...)
Collects sensory data from a BMP280 and a DHT11, and sends the collected data to the ThingSpeak channel provided.
I am assuming that you know how to upload a sketch to your ESP-01, so i am not going into those details.
Without a voltage regulator, the circuit has to be powered with max 3.3V DC.
Not much text is added, tutorial should be straightforward from this point.

Step 1: Step 1: BOM

Hardware:

1 x Wifi module: ESP-01 (i am using the 1024 KB version)

1 x Pressure and Temperature sensor: BMP280

1 x Humidity and Temperature sensor: DHT11

1 x Voltage Regulator AMS1117 (optional for direct powering, or you can use any other capable of regulating your input voltage down to a fixed 3.3V)

Step 2: Step 2: Wiring

ESP-01 VCC to 3.3V
ESP-01 GND to GND
ESP-01 TX to DHT11 DATA
ESP-01 GPIO0 to BMP280 SDA
ESP-01 GPIO2 to BMP280 SCL
DHT11 VCC to 3.3V
DHT11 GND to GND
BMP280 VCC to 3.3V
BMP280 GND to GND

Step 3: Step 3: Code

#include <DHT.h>
#include <OneWire.h>
#include <Adafruit_BMP280.h> //CHECK #define BMP280_ADDRESS mine works with (0x76)
#include <ESP8266WiFi.h>
#define DHTPIN 1        //GPIO1 (Tx)
#define DHTTYPE  DHT11
#define ONE_WIRE_BUS 3  // GPIO3=Rx
const char* ssid        = "asd"; //YOUR WIFI SSID
const char* password    = "asd"; //YOUR WIFIPASS
const char* host        = "api.thingspeak.com";
const char* writeAPIKey = "asd"; //YOUR APIKEY
//DHT11 stuff
float temperature_buiten;
float temperature_buiten2;
DHT dht(DHTPIN, DHTTYPE, 15);
//BMP280
Adafruit_BMP280 bmp;
void setup()
  {
    //I2C stuff
    Wire.pins(0, 2);
    Wire.begin(0, 2);
    //DHT1
    dht.begin();
    //BMP280
    if (!bmp.begin())
      {
      //   Serial.println("No BMP280");
      //   while (1) {}
      }
    //Connect to WiFi network
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED)
      {
        delay(500);
      }
  }
void loop()
  {
    //DHT11
    float humidity    = dht.readHumidity();
    float temperature = dht.readTemperature();
    if (isnan(humidity) || isnan(temperature))
      {
        return;
      }
    //BMP280
      String t = String(bmp.readTemperature());
      String p = String(bmp.readPressure());
    //TCP CONNECTION
    WiFiClient client;
    const int httpPort = 80;
    if (!client.connect(host, httpPort))
      {
        return;
      }
    String url = "/update?key=";
    url += writeAPIKey;
    url += "&field1=";
    url += String(temperature); //DHT11 CELSIUS
    url += "&field2=";
    url += String(humidity); //DHT11 RELATIVE HUMIDITY
    url +="&field3=";
    url +=String(bmp.readTemperature()); //BMP280 CELSIUS
    url +="&field4=";
    url +=String(bmp.readPressure()/100); //BMP280 MILLIBAR
    url +="&field5=";
    url +=String(bmp.readAltitude(1013.25)); //BMP280 METER
    url +="&field6=";
    url +=String((temperature+bmp.readTemperature())/2); //DHT11 + BMP280 AVERAGE CELSIUS
    url += "\r\n";
    // Send request to the server
    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n\r\n");
    delay(1000);
}