From 77cbdf47b981d41876b27592e8e533186bf7138c Mon Sep 17 00:00:00 2001
From: Cedric Girard <girardc@valinor.fr>
Date: Thu, 2 May 2019 15:59:42 +0200
Subject: [PATCH] Add readings from BME280 sensor

---
 .gitmodules           |  3 +++
 esp32-env-monitor.ino | 45 ++++++++++++++++++++++++++++++++++++++++++-
 libraries/BME280      |  1 +
 3 files changed, 48 insertions(+), 1 deletion(-)
 create mode 160000 libraries/BME280

diff --git a/.gitmodules b/.gitmodules
index cbf8a57..b7655a4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "libraries/U8g2_Arduino"]
 	path = libraries/U8g2_Arduino
 	url = https://github.com/olikraus/U8g2_Arduino
+[submodule "libraries/BME280"]
+	path = libraries/BME280
+	url = https://github.com/finitespace/BME280.git
diff --git a/esp32-env-monitor.ino b/esp32-env-monitor.ino
index 8ba3d22..996e9cc 100644
--- a/esp32-env-monitor.ino
+++ b/esp32-env-monitor.ino
@@ -9,11 +9,16 @@
 #include <SPI.h>
 #endif
 
+#include <BME280I2C.h>
+#include <Wire.h>
+
 U8X8_SSD1327_EA_W128128_4W_HW_SPI u8x8(/* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
 
+BME280I2C bme;    // Default : forced mode, standby time = 1000 ms
+                  // Oversampling = pressure ×1, temperature ×1, humidity ×1, filter off,
+
 // setup the terminal (U8X8LOG) and connect to u8g2 for automatic refresh of the display
 // The size (width * height) depends on the display 
-
 #define U8LOG_WIDTH 16
 #define U8LOG_HEIGHT 12
 uint8_t u8log_buffer[U8LOG_WIDTH*U8LOG_HEIGHT];
@@ -49,12 +54,50 @@ void setup() {
   u8x8log.print("\n");
   u8x8log.print("\n");
 
+  //Init BME280 sensor
+  Wire.begin();
+
+  while(!bme.begin())
+  {
+    u8x8log.print("Could not find BME280 sensor!\n");
+    delay(1000);
+  }
+
+  switch(bme.chipModel())
+  {
+     case BME280::ChipModel_BME280:
+       u8x8log.print("Found BME280 sensor! Success.\n");
+       break;
+     case BME280::ChipModel_BMP280:
+       u8x8log.print("Found BMP280 sensor! No Humidity available.\n");
+       break;
+     default:
+       u8x8log.print("Found UNKNOWN sensor! Error!\n");
+  }
+
 }
 
 void loop() {
 
   //Clear screen
   u8x8log.print("\f");
+
+  float temp(NAN), hum(NAN), pres(NAN);
+  BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
+  BME280::PresUnit presUnit(BME280::PresUnit_Pa);
+
+  bme.read(pres, temp, hum, tempUnit, presUnit);
+
+  u8x8log.print("Temp: ");
+  u8x8log.print(temp);
+  u8x8log.print("°"+ String(tempUnit == BME280::TempUnit_Celsius ? 'C' :'F'));
+  u8x8log.print("\nHumidity: ");
+  u8x8log.print(hum);
+  u8x8log.print("% RH");
+  u8x8log.print("\nPressure: ");
+  u8x8log.print(pres);
+  u8x8log.print("Pa\n");
+
   delay(10000);
 
 }
diff --git a/libraries/BME280 b/libraries/BME280
new file mode 160000
index 0000000..7a211f0
--- /dev/null
+++ b/libraries/BME280
@@ -0,0 +1 @@
+Subproject commit 7a211f03aa3ac5567b14e2cbc12ac21e185b6e0b