From 25887fc70de98b5ebed083017c23724a788d80b2 Mon Sep 17 00:00:00 2001
From: Hendrik Langer <hendrik+dev@xd0.de>
Date: Fri, 19 Jul 2019 13:44:14 +0200
Subject: [PATCH] add BME680

---
 README.md      |  1 +
 platformio.ini |  2 ++
 src/main.cpp   | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+)

diff --git a/README.md b/README.md
index 77ddc23..9d23be4 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,4 @@ This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md
 
 * [PlatformIO](https://platformio.org) - Cross-platform IDE
 * [GxEPD2](https://github.com/ZinggJM/GxEPD2) - E-Paper display library
+* [Adafruit BME680](https://github.com/adafruit/Adafruit_BME680) - BME680 Sensor Library
diff --git a/platformio.ini b/platformio.ini
index 4cf6d1b..dfcaf32 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -26,6 +26,8 @@ build_flags =
 lib_deps =
     GxEPD2
     Adafruit GFX Library
+    Adafruit BME680 Library
+    Adafruit Unified Sensor
 ;    ArduinoJSON
 
 monitor_speed = 115200
diff --git a/src/main.cpp b/src/main.cpp
index 808de58..4a7da81 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,12 +8,21 @@
 #include <WiFi.h>
 #include <WiFiMulti.h>
 
+#include <Wire.h>
+#include <SPI.h>
+
 #include <GxEPD2_BW.h>
 #include <Fonts/FreeMonoBold9pt7b.h>
 #include "bitmaps/Bitmaps128x250.h"
 
+#include <Adafruit_Sensor.h>
+#include "Adafruit_BME680.h"
+
+static const char* TAG = "MAIN";
+
 WiFiMulti wifiMulti;
 GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=TFT_CS*/ SS, /*DC=*/ TFT_DC, /*RST=*/ TFT_RST, /*BUSY=*/ -1)); // GDEH0213B72
+Adafruit_BME680 bme; // I2C (also available: hardware SPI
 
 void helloWorld()
 {
@@ -50,6 +59,17 @@ void setup()
   helloWorld();
   display.powerOff();
 
+  if (!bme.begin()) {
+    ESP_LOGE(TAG, "Could not find a valid BME680 sensor, check wiring!");
+  }
+
+  // Set up oversampling and filter initialization
+  bme.setTemperatureOversampling(BME680_OS_8X);
+  bme.setHumidityOversampling(BME680_OS_2X);
+  bme.setPressureOversampling(BME680_OS_4X);
+  bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
+  bme.setGasHeater(320, 150); // 320*C for 150 ms
+
   wifiMulti.addAP(WIFI_SSID, WIFI_PASSWD);
   wifiMulti.addAP(WIFI_SSID2, WIFI_PASSWD2);
 
@@ -64,8 +84,28 @@ void setup()
 
 void loop()
 {
+  unsigned long endTime = bme.beginReading();
+  if (! bme.performReading()) {
+    ESP_LOGE(TAG, "BME680: Failed to perform reading :(");
+    return;
+  }
+
+  Serial.print("Temperature = "); Serial.print(bme.temperature); Serial.println(" *C");
+  display.print("Temperature: "); display.print(bme.temperature); display.println(" *C");
+
+  Serial.print("Pressure = "); Serial.print(bme.pressure / 100.0); Serial.println(" hPa");
+  display.print("Pressure: "); display.print(bme.pressure / 100); display.println(" hPa");
+
+  Serial.print("Humidity = "); Serial.print(bme.humidity); Serial.println(" %");
+  display.print("Humidity: "); display.print(bme.humidity); display.println(" %");
+
+  Serial.print("Gas = "); Serial.print(bme.gas_resistance / 1000.0); Serial.println(" KOhms");
+  display.print("Gas: "); display.print(bme.gas_resistance / 1000.0); display.println(" KOhms");
+
   if(wifiMulti.run() != WL_CONNECTED) {
     Serial.println("WiFi not connected!");
     delay(1000);
   }
+
+  delay(1000);
 }