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arduino-cli/libraries/Adafruit_BMP085_Library/examples/BMP085test/BMP085test.ino

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+#include <Adafruit_BMP085.h>
+
+/*************************************************** 
+  This is an example for the BMP085 Barometric Pressure & Temp Sensor
+
+  Designed specifically to work with the Adafruit BMP085 Breakout 
+  ----> https://www.adafruit.com/products/391
+
+  These pressure and temperature sensors use I2C to communicate, 2 pins
+  are required to interface
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+// Connect VCC of the BMP085 sensor to 3.3V (NOT 5.0V!)
+// Connect GND to Ground
+// Connect SCL to i2c clock - on '168/'328 Arduino Uno/Duemilanove/etc thats Analog 5
+// Connect SDA to i2c data - on '168/'328 Arduino Uno/Duemilanove/etc thats Analog 4
+// EOC is not used, it signifies an end of conversion
+// XCLR is a reset pin, also not used here
+
+Adafruit_BMP085 bmp;
+  
+void setup() {
+  Serial.begin(9600);
+  if (!bmp.begin()) {
+	Serial.println("Could not find a valid BMP085 sensor, check wiring!");
+	while (1) {}
+  }
+}
+  
+void loop() {
+    Serial.print("Temperature = ");
+    Serial.print(bmp.readTemperature());
+    Serial.println(" *C");
+    
+    Serial.print("Pressure = ");
+    Serial.print(bmp.readPressure());
+    Serial.println(" Pa");
+    
+    // Calculate altitude assuming 'standard' barometric
+    // pressure of 1013.25 millibar = 101325 Pascal
+    Serial.print("Altitude = ");
+    Serial.print(bmp.readAltitude());
+    Serial.println(" meters");
+
+    Serial.print("Pressure at sealevel (calculated) = ");
+    Serial.print(bmp.readSealevelPressure());
+    Serial.println(" Pa");
+
+  // you can get a more precise measurement of altitude
+  // if you know the current sea level pressure which will
+  // vary with weather and such. If it is 1015 millibars
+  // that is equal to 101500 Pascals.
+    Serial.print("Real altitude = ");
+    Serial.print(bmp.readAltitude(101500));
+    Serial.println(" meters");
+    
+    Serial.println();
+    delay(500);
+}