ESP8266 and BME280 Temp, Pressure and Humidity Sensor over SPI

As part of a bigger project to measure temperature and humidity I’ve set up the NodeMcu ESP8266 (ESP12E) with a GY BME280 as below. I’m using ‘Software’ SPI which means I assign the pins used for the SPI bus in the code rather than use the standard SPI pins on the NodeMcu.

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The code is below. You might need to install the two Adafruit libraries. The Sensor one can be difficult to find in the Arduino libraries – search unified abstraction and it should show at the top.

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

// assign the ESP8266 pins to arduino pins
#define D1 5
#define D2 4
#define D4 2
#define D3 0

// assign the SPI bus to pins
#define BME_SCK D1
#define BME_MISO D4
#define BME_MOSI D2
#define BME_CS D3

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI

unsigned long delayTime;

void setup() {
    Serial.begin(9600);
    Serial.println(F("BME280 test"));

    bool status;
    
    // default settings
    status = bme.begin();
    if (!status) {
        Serial.println("Could not find a valid BME280 sensor, check wiring!");
        while (1);
    }
    
    Serial.println("-- Default Test --");
    delayTime = 1000;

    Serial.println();
}


void loop() { 
    printValues();
    delay(delayTime);
}


void printValues() {
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" *C");

    Serial.print("Pressure = ");

    Serial.print(bme.readPressure() / 100.0F);
    Serial.println(" hPa");

    Serial.print("Approx. Altitude = ");
    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
    Serial.println(" m");

    Serial.print("Humidity = ");
    Serial.print(bme.readHumidity());
    Serial.println(" %");

    Serial.println();
}

These are the actual items I used but you can find the same on many other sites.
ESP8266 – http://www.ebay.es/itm/201838061951
BME280 – http://www.ebay.es/itm/112471267075

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