182 lines
4.5 KiB
Arduino
182 lines
4.5 KiB
Arduino
/******************************************************************************
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LCD_DeltaAltitude.ino
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BME280 Arduino and Teensy example
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Marshall Taylor @ SparkFun Electronics
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Oct 19, 2015
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https://github.com/sparkfun/SparkFun_BME280_Arduino_Library
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This sketch configures a BME280 to measure height changes, with a button
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to zero.
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Hardware connections:
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BME280 -> Arduino
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GND -> GND
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3.3 -> 3.3
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SDA -> A4
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SCL -> A5
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Button (Normally open) between A4 and A5.
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LCD:
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* LCD RS pin to digital pin 7
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* LCD Enable pin to digital 6
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* LCD D4 pin to digital pin 5
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* LCD D5 pin to digital pin 4
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* LCD D6 pin to digital pin 3
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* LCD D7 pin to digital pin 2
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* LCD R/W pin to ground
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* 10K resistor:
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* ends to +5V and ground
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* wiper to LCD VO pin (pin 3)
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To use, run the sketch, then press and hold the button until the data on the
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serial monitor shows zero. Then, move the sensor to a new altitude and watch
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how the output changes!
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Note: For most accurate results keep the sensor orientation and temperature the
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same between measurements.
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Resources:
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Uses Wire.h for I2C operation
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Uses SPI.h for SPI operation
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Included CircularBuffer class for averaging
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Development environment specifics:
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Arduino IDE 1.6.4
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Teensy loader 1.23
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This code is released under the [MIT License](http://opensource.org/licenses/MIT).
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Please review the LICENSE.md file included with this example. If you have any questions
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or concerns with licensing, please contact techsupport@sparkfun.com.
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Distributed as-is; no warranty is given.
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******************************************************************************/
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#include <stdint.h>
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#include "SparkFunBME280.h"
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#include "CircularBuffer.h"
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#include "Wire.h"
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#include "SPI.h"
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#include <LiquidCrystal.h>
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//Global sensor object
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BME280 mySensor;
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uint8_t buttonGroundPin = A0;
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uint8_t buttonSensePin = A2;
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CircularBuffer myBuffer(50);
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//int icounter = 0;
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float reference = 0;
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LiquidCrystal lcd(7,6,5,4,3,2);
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void setup()
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{
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//Configure the button IO
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pinMode( buttonSensePin, INPUT_PULLUP );
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pinMode( buttonGroundPin, OUTPUT );
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digitalWrite( buttonGroundPin, 0 );
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//***Driver settings********************************//
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//commInterface can be I2C_MODE or SPI_MODE
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//specify chipSelectPin using arduino pin names
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//specify I2C address. Can be 0x77(default) or 0x76
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//For I2C, enable the following and disable the SPI section
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mySensor.settings.commInterface = I2C_MODE;
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mySensor.settings.I2CAddress = 0x77;
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//For SPI enable the following and dissable the I2C section
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//mySensor.settings.commInterface = SPI_MODE;
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//mySensor.settings.chipSelectPin = 10;
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//***Operation settings*****************************//
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//renMode can be:
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// 0, Sleep mode
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// 1 or 2, Forced mode
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// 3, Normal mode
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mySensor.settings.runMode = 3; //Forced mode
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//tStandby can be:
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// 0, 0.5ms
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// 1, 62.5ms
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// 2, 125ms
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// 3, 250ms
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// 4, 500ms
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// 5, 1000ms
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// 6, 10ms
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// 7, 20ms
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mySensor.settings.tStandby = 0;
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//filter can be off or number of FIR coefficients to use:
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// 0, filter off
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// 1, coefficients = 2
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// 2, coefficients = 4
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// 3, coefficients = 8
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// 4, coefficients = 16
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mySensor.settings.filter = 4;
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//tempOverSample can be:
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// 0, skipped
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// 1 through 5, oversampling *1, *2, *4, *8, *16 respectively
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mySensor.settings.tempOverSample = 5;
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//pressOverSample can be:
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// 0, skipped
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// 1 through 5, oversampling *1, *2, *4, *8, *16 respectively
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mySensor.settings.pressOverSample = 5;
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//humidOverSample can be:
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// 0, skipped
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// 1 through 5, oversampling *1, *2, *4, *8, *16 respectively
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mySensor.settings.humidOverSample = 0;
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Serial.begin(57600);
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Serial.print("Program Started\n");
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Serial.print("Starting BME280... result of .begin(): 0x");
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//Calling .begin() causes the settings to be loaded
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delay(10);//Needs > 2 ms to start up
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Serial.println(mySensor.begin(), HEX);
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Serial.println();
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lcd.begin(16, 2);
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lcd.clear();
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}
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void loop()
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{
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//Get the local temperature! Do this for calibration
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mySensor.readTempC();
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//Check button. No debounce, so hold for operation
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if( digitalRead( buttonSensePin ) == 0 )
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{
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//Set reference altitude.
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reference = mySensor.readFloatAltitudeFeet();
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}
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float lastAlt = mySensor.readFloatAltitudeFeet() - reference;
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myBuffer.pushElement(lastAlt);
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float tempAlt = myBuffer.averageLast(8); //Do an average of the latest samples
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lcd.setCursor(0,0);
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lcd.print("Altitude: ");
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myBuffer.pushElement(lastAlt);
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lcd.setCursor(0,1);
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if(tempAlt >= 0)
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{
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lcd.print(" ");
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}
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lcd.print(tempAlt);
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lcd.print(" ft ");
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delay(200);
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}
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