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/***************************************************************************
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This is a library for the BME280 humidity, temperature & pressure sensor
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Designed specifically to work with the Adafruit BME280 Breakout
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----> http://www.adafruit.com/products/2650
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These sensors use I2C or SPI to communicate, 2 or 4 pins are required
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to interface. The device's I2C address is either 0x76 or 0x77.
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Adafruit invests time and resources providing this open source code,
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please support Adafruit andopen-source hardware by purchasing products
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from Adafruit!
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Written by Limor Fried & Kevin Townsend for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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See the LICENSE file for details.
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***************************************************************************/
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/*
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Adapted by Starbeamrainbowlabs <https://starbeamrainbowlabs.com/>
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GitHub: @sbrl | Twitter: @SBRLabs | Reddit: u/Starbeamrainbowlabs
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# PROTOCOL SPEC
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## INPUT
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4 character commands. Whitespace and non-printable characters are ignored.
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### COMMANDS
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Command | Meaning
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--------|-----------------------------------------------------------
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read | Read the sensor values and write the result to stdout
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*/
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#include <Wire.h>
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#include <SPI.h>
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// These libraries need installing in the Arduino IDE Library Manager (if you install the BME280 one it should prompt for the unified sensor library automatically)
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#include <Adafruit_Sensor.h>
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#include <Adafruit_BME280.h>
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#define BME_SCK 13
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#define BME_MISO 12
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#define BME_MOSI 11
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#define BME_CS 10
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#define SEALEVELPRESSURE_HPA (1013.25)
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Adafruit_BME280 bme; // I2C
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//Adafruit_BME280 bme(BME_CS); // hardware SPI
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//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
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// Read buffer
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#define BUFFER_SIZE 4
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int bufferIndex = 0;
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char buffer[BUFFER_SIZE];
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void setup() {
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Serial.begin(9600);
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while(!Serial); // time to get serial running
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Serial.println(F("BME280 test"));
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unsigned status;
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// default settings
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status = bme.begin(0x76);
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// You can also pass in a Wire library object like &Wire2
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// status = bme.begin(0x76, &Wire2)
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if (!status) {
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Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
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Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
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Serial.print(" ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
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Serial.print(" ID of 0x56-0x58 represents a BMP 280,\n");
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Serial.print(" ID of 0x60 represents a BME 280.\n");
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Serial.print(" ID of 0x61 represents a BME 680.\n");
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while (1) delay(10);
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}
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Serial.println("-- Default Test --");
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Serial.println();
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}
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void loop() {
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while(Serial.available() > 0) {
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buffer[bufferIndex] = Serial.read();
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// Serial.print("Reading char, index: ");
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// Serial.print(bufferIndex, DEC);
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// Serial.print(", is greater: ");
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// Serial.print(bufferIndex >= BUFFER_SIZE);
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// Serial.print(", char: ");
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// Serial.print(buffer[bufferIndex]);
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// Serial.print(", hex: ");
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// Serial.println(buffer[bufferIndex], HEX);
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// If it's a newline character, overwrite it
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if(buffer[bufferIndex] < 48 || buffer[bufferIndex] > 122) {
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// Serial.println("Skipping unrecognised char");
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continue;
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}
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if(bufferIndex >= BUFFER_SIZE - 1) {
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// Serial.println("Handling command");
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handle_command();
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// Serial.print("Resetting index, is now: ");
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bufferIndex = 0;
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// Serial.println(bufferIndex, DEC);
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continue;
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}
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// Serial.println("Incrementing counter");
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bufferIndex += 1;
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}
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}
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void handle_command() {
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// Serial.print("strcmp: ");
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// Serial.println(strncmp(buffer, "read", BUFFER_SIZE), DEC);
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if(strncmp(buffer, "read", BUFFER_SIZE) == 0) { // 0 = They are the same
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printValues();
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}
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else {
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Serial.print("Error: Unknown command ");
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Serial.println(buffer);
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}
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}
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void printValues() {
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Serial.print("Temperature ");
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Serial.println(bme.readTemperature());
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// Serial.println(" *C");
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Serial.print("Pressure ");
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Serial.println(bme.readPressure() / 100.0F);
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// Serial.println(" hPa");
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Serial.print("ApproxAltitude ");
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Serial.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
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// Serial.println(" m");
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Serial.print("Humidity ");
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Serial.println(bme.readHumidity());
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// Serial.println(" %");
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// Serial.println();
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}
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