You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
243 lines
7.8 KiB
243 lines
7.8 KiB
// -----------------------------------------------------------------------------
|
|
// BME280/BMP280 Sensor over I2C
|
|
// Uses SparkFun BME280 library
|
|
// Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
|
|
// -----------------------------------------------------------------------------
|
|
|
|
#pragma once
|
|
|
|
#include "Arduino.h"
|
|
#include "I2CSensor.h"
|
|
#include <SparkFunBME280.h>
|
|
|
|
#define BMX280_CHIP_BMP280 0x58
|
|
#define BMX280_CHIP_BME280 0x60
|
|
|
|
class BMX280Sensor : public I2CSensor {
|
|
|
|
public:
|
|
|
|
static unsigned char addresses[2];
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Public
|
|
// ---------------------------------------------------------------------
|
|
|
|
BMX280Sensor(): I2CSensor() {
|
|
_sensor_id = SENSOR_BMX280_ID;
|
|
_bme = new BME280();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Sensor API
|
|
// ---------------------------------------------------------------------
|
|
|
|
// Initialization method, must be idempotent
|
|
void begin() {
|
|
|
|
if (!_dirty) return;
|
|
_dirty = false;
|
|
_chip = 0;
|
|
|
|
// I2C auto-discover
|
|
_address = _begin_i2c(_address, sizeof(BMX280Sensor::addresses), BMX280Sensor::addresses);
|
|
if (_address == 0) return;
|
|
|
|
// Init
|
|
_init();
|
|
|
|
}
|
|
|
|
// Descriptive name of the sensor
|
|
String description() {
|
|
char buffer[20];
|
|
snprintf(buffer, sizeof(buffer), "%s @ I2C (0x%02X)", _chip == BMX280_CHIP_BME280 ? "BME280" : "BMP280", _address);
|
|
return String(buffer);
|
|
}
|
|
|
|
// Type for slot # index
|
|
magnitude_t type(unsigned char index) {
|
|
if (index < _count) {
|
|
_error = SENSOR_ERROR_OK;
|
|
unsigned char i = 0;
|
|
#if BMX280_TEMPERATURE > 0
|
|
if (index == i++) return MAGNITUDE_TEMPERATURE;
|
|
#endif
|
|
#if BMX280_PRESSURE > 0
|
|
if (index == i++) return MAGNITUDE_PRESSURE;
|
|
#endif
|
|
#if BMX280_HUMIDITY > 0
|
|
if (_chip == BMX280_CHIP_BME280) {
|
|
if (index == i) return MAGNITUDE_HUMIDITY;
|
|
}
|
|
#endif
|
|
}
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return MAGNITUDE_NONE;
|
|
}
|
|
|
|
// Pre-read hook (usually to populate registers with up-to-date data)
|
|
virtual void pre() {
|
|
|
|
if (_chip == 0) {
|
|
_error = SENSOR_ERROR_UNKNOWN_ID;
|
|
return;
|
|
}
|
|
|
|
#if BMX280_MODE == 1
|
|
forceRead();
|
|
#endif
|
|
|
|
}
|
|
|
|
// Current value for slot # index
|
|
double value(unsigned char index) {
|
|
|
|
if (index < _count) {
|
|
_error = SENSOR_ERROR_OK;
|
|
unsigned char i = 0;
|
|
#if BMX280_TEMPERATURE > 0
|
|
if (index == i++) return _bme->readTempC();
|
|
#endif
|
|
#if BMX280_PRESSURE > 0
|
|
if (index == i++) return _bme->readFloatPressure() / 100;
|
|
#endif
|
|
#if BMX280_HUMIDITY > 0
|
|
if (_chip == BMX280_CHIP_BME280) {
|
|
if (index == i) return _bme->readFloatHumidity();
|
|
}
|
|
#endif
|
|
}
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return 0;
|
|
}
|
|
|
|
// Load the configuration manifest
|
|
static void manifest(JsonArray& sensors) {
|
|
|
|
char buffer[10];
|
|
|
|
JsonObject& sensor = sensors.createNestedObject();
|
|
sensor["sensor_id"] = SENSOR_BMX280_ID;
|
|
JsonArray& fields = sensor.createNestedArray("fields");
|
|
|
|
{
|
|
JsonObject& field = fields.createNestedObject();
|
|
field["tag"] = UI_TAG_SELECT;
|
|
field["name"] = "address";
|
|
field["label"] = "Address";
|
|
JsonArray& options = field.createNestedArray("options");
|
|
{
|
|
JsonObject& option = options.createNestedObject();
|
|
option["name"] = "auto";
|
|
option["value"] = 0;
|
|
}
|
|
for (unsigned char i=0; i< sizeof(BMX280Sensor::addresses); i++) {
|
|
JsonObject& option = options.createNestedObject();
|
|
snprintf(buffer, sizeof(buffer), "0x%02X", BMX280Sensor::addresses[i]);
|
|
option["name"] = String(buffer);
|
|
option["value"] = BMX280Sensor::addresses[i];
|
|
}
|
|
}
|
|
|
|
};
|
|
|
|
void getConfig(JsonObject& root) {
|
|
root["sensor_id"] = _sensor_id;
|
|
root["address"] = getAddress();
|
|
};
|
|
|
|
void setConfig(JsonObject& root) {
|
|
if (root.containsKey("address")) setAddress(root["address"]);
|
|
};
|
|
|
|
protected:
|
|
|
|
void _init() {
|
|
|
|
_bme->settings.commInterface = I2C_MODE;
|
|
_bme->settings.I2CAddress = _address;
|
|
_bme->settings.runMode = BMX280_MODE;
|
|
_bme->settings.tStandby = 0;
|
|
_bme->settings.filter = 0;
|
|
_bme->settings.tempOverSample = BMX280_TEMPERATURE;
|
|
_bme->settings.pressOverSample = BMX280_PRESSURE;
|
|
_bme->settings.humidOverSample = BMX280_HUMIDITY;
|
|
|
|
// Fix when not measuring temperature, t_fine should have a sensible value
|
|
if (BMX280_TEMPERATURE == 0) _bme->t_fine = 100000; // aprox 20ºC
|
|
|
|
// Make sure sensor had enough time to turn on. BMX280 requires 2ms to start up
|
|
delay(10);
|
|
|
|
// Check sensor correctly initialized
|
|
_chip = _bme->begin();
|
|
if ((_chip != BMX280_CHIP_BME280) && (_chip != BMX280_CHIP_BMP280)) {
|
|
_chip = 0;
|
|
i2cReleaseLock(_address);
|
|
_error = SENSOR_ERROR_UNKNOWN_ID;
|
|
}
|
|
|
|
#if BMX280_TEMPERATURE > 0
|
|
++_count;
|
|
#endif
|
|
#if BMX280_PRESSURE > 0
|
|
++_count;
|
|
#endif
|
|
#if BMX280_HUMIDITY > 0
|
|
if (_chip == BMX280_CHIP_BME280) ++_count;
|
|
#endif
|
|
|
|
_measurement_delay = measurementTime();
|
|
|
|
}
|
|
|
|
unsigned long measurementTime() {
|
|
|
|
// Measurement Time (as per BMX280 datasheet section 9.1)
|
|
// T_max(ms) = 1.25
|
|
// + (2.3 * T_oversampling)
|
|
// + (2.3 * P_oversampling + 0.575)
|
|
// + (2.4 * H_oversampling + 0.575)
|
|
// ~ 9.3ms for current settings
|
|
|
|
double t = 1.25;
|
|
#if BMX280_TEMPERATURE > 0
|
|
t += (2.3 * BMX280_TEMPERATURE);
|
|
#endif
|
|
#if BMX280_PRESSURE > 0
|
|
t += (2.3 * BMX280_PRESSURE + 0.575);
|
|
#endif
|
|
#if BMX280_HUMIDITY > 0
|
|
if (_chip == BMX280_CHIP_BME280) {
|
|
t += (2.4 * BMX280_HUMIDITY + 0.575);
|
|
}
|
|
#endif
|
|
|
|
return round(t + 1); // round up
|
|
|
|
}
|
|
|
|
void forceRead() {
|
|
|
|
// We set the sensor in "forced mode" to force a reading.
|
|
// After the reading the sensor will go back to sleep mode.
|
|
uint8_t value = _bme->readRegister(BME280_CTRL_MEAS_REG);
|
|
value = (value & 0xFC) + 0x01;
|
|
_bme->writeRegister(BME280_CTRL_MEAS_REG, value);
|
|
|
|
delay(_measurement_delay);
|
|
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
|
|
BME280 * _bme = NULL;
|
|
unsigned char _chip;
|
|
unsigned long _measurement_delay;
|
|
|
|
};
|
|
|
|
// Static inizializations
|
|
|
|
unsigned char BMX280Sensor::addresses[2] = {0x76, 0x77};
|