Fork of the espurna firmware for `mhsw` switches
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// -----------------------------------------------------------------------------
// BME280/BMP280 Sensor over I2C
// Uses SparkFun BME280 library
// Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
// -----------------------------------------------------------------------------
#if SENSOR_SUPPORT && BMX280_SUPPORT
#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();
}
~BMX280Sensor() {
delete _bme;
}
// ---------------------------------------------------------------------
// 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
unsigned char 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};
#endif // SENSOR_SUPPORT && BMX280_SUPPORT