MS5837 and BMP280 functionality for inches water

lib/lib_i2c/BlueRobotics_MS5837_Library/MS5837.cpp

@@ -0,0 +1,258 @@
+#include "MS5837.h"
+#include <Wire.h>
+
+const uint8_t MS5837_ADDR = 0x76;
+const uint8_t MS5837_RESET = 0x1E;
+const uint8_t MS5837_ADC_READ = 0x00;
+const uint8_t MS5837_PROM_READ = 0xA0;
+const uint8_t MS5837_CONVERT_D1_8192 = 0x4A;
+const uint8_t MS5837_CONVERT_D2_8192 = 0x5A;
+
+const float MS5837::Pa = 100.0f;
+const float MS5837::bar = 0.001f;
+const float MS5837::mbar = 1.0f;
+
+const uint8_t MS5837::MS5837_30BA = 0;
+const uint8_t MS5837::MS5837_02BA = 1;
+const uint8_t MS5837::MS5837_UNRECOGNISED = 255;
+
+const uint8_t MS5837_02BA01 = 0x00; // Sensor version: From MS5837_02BA datasheet Version PROM Word 0
+const uint8_t MS5837_02BA21 = 0x15; // Sensor version: From MS5837_02BA datasheet Version PROM Word 0
+const uint8_t MS5837_30BA26 = 0x1A; // Sensor version: From MS5837_30BA datasheet Version PROM Word 0
+
+MS5837::MS5837() {
+	fluidDensity = 1029;
+}
+
+bool MS5837::begin(TwoWire &wirePort) {
+	return (init(wirePort));
+}
+
+bool MS5837::init(TwoWire &wirePort) {
+	_i2cPort = &wirePort; //Grab which port the user wants us to use
+
+	// Reset the MS5837, per datasheet
+	_i2cPort->beginTransmission(MS5837_ADDR);
+	_i2cPort->write(MS5837_RESET);
+	_i2cPort->endTransmission();
+
+	// Wait for reset to complete
+	delay(10);
+
+	// Read calibration values and CRC
+	for ( uint8_t i = 0 ; i < 7 ; i++ ) {
+		_i2cPort->beginTransmission(MS5837_ADDR);
+		_i2cPort->write(MS5837_PROM_READ+i*2);
+		_i2cPort->endTransmission();
+
+		_i2cPort->requestFrom(MS5837_ADDR,2);
+		C[i] = (_i2cPort->read() << 8) | _i2cPort->read();
+	}
+
+	// Verify that data is correct with CRC
+	uint8_t crcRead = C[0] >> 12;
+	uint8_t crcCalculated = crc4(C);
+
+	if ( crcCalculated != crcRead ) {
+		return false; // CRC fail
+	}
+
+	uint8_t version = (C[0] >> 5) & 0x7F; // Extract the sensor version from PROM Word 0
+
+	// Set _model according to the sensor version
+	if (version == MS5837_02BA01)
+	{
+		_model = MS5837_02BA;
+	}
+	else if (version == MS5837_02BA21)
+	{
+		_model = MS5837_02BA;
+	}
+	else if (version == MS5837_30BA26)
+	{
+		_model = MS5837_30BA;
+	}
+	else
+	{
+		_model = MS5837_UNRECOGNISED;
+	}
+	// The sensor has passed the CRC check, so we should return true even if
+	// the sensor version is unrecognised.
+	// (The MS5637 has the same address as the MS5837 and will also pass the CRC check)
+	// (but will hopefully be unrecognised.)
+	return true;
+}
+
+void MS5837::setModel(uint8_t model) {
+	_model = model;
+}
+
+uint8_t MS5837::getModel() {
+	return (_model);
+}
+
+void MS5837::setFluidDensity(float density) {
+	fluidDensity = density;
+}
+
+void MS5837::read() {
+	//Check that _i2cPort is not NULL (i.e. has the user forgoten to call .init or .begin?)
+	if (_i2cPort == NULL)
+	{
+		return;
+	}
+
+	// Request D1 conversion
+	_i2cPort->beginTransmission(MS5837_ADDR);
+	_i2cPort->write(MS5837_CONVERT_D1_8192);
+	_i2cPort->endTransmission();
+
+	delay(20); // Max conversion time per datasheet
+
+	_i2cPort->beginTransmission(MS5837_ADDR);
+	_i2cPort->write(MS5837_ADC_READ);
+	_i2cPort->endTransmission();
+
+	_i2cPort->requestFrom(MS5837_ADDR,3);
+	D1_pres = 0;
+	D1_pres = _i2cPort->read();
+	D1_pres = (D1_pres << 8) | _i2cPort->read();
+	D1_pres = (D1_pres << 8) | _i2cPort->read();
+
+	// Request D2 conversion
+	_i2cPort->beginTransmission(MS5837_ADDR);
+	_i2cPort->write(MS5837_CONVERT_D2_8192);
+	_i2cPort->endTransmission();
+
+	delay(20); // Max conversion time per datasheet
+
+	_i2cPort->beginTransmission(MS5837_ADDR);
+	_i2cPort->write(MS5837_ADC_READ);
+	_i2cPort->endTransmission();
+
+	_i2cPort->requestFrom(MS5837_ADDR,3);
+	D2_temp = 0;
+	D2_temp = _i2cPort->read();
+	D2_temp = (D2_temp << 8) | _i2cPort->read();
+	D2_temp = (D2_temp << 8) | _i2cPort->read();
+
+	calculate();
+}
+
+void MS5837::calculate() {
+	// Given C1-C6 and D1, D2, calculated TEMP and P
+	// Do conversion first and then second order temp compensation
+
+	int32_t dT = 0;
+	int64_t SENS = 0;
+	int64_t OFF = 0;
+	int32_t SENSi = 0;
+	int32_t OFFi = 0;
+	int32_t Ti = 0;
+	int64_t OFF2 = 0;
+	int64_t SENS2 = 0;
+
+	// Terms called
+	dT = D2_temp-uint32_t(C[5])*256l;
+	if ( _model == MS5837_02BA ) {
+		SENS = int64_t(C[1])*65536l+(int64_t(C[3])*dT)/128l;
+		OFF = int64_t(C[2])*131072l+(int64_t(C[4])*dT)/64l;
+		P = (D1_pres*SENS/(2097152l)-OFF)/(32768l);
+	} else {
+		SENS = int64_t(C[1])*32768l+(int64_t(C[3])*dT)/256l;
+		OFF = int64_t(C[2])*65536l+(int64_t(C[4])*dT)/128l;
+		P = (D1_pres*SENS/(2097152l)-OFF)/(8192l);
+	}
+
+	// Temp conversion
+	TEMP = 2000l+int64_t(dT)*C[6]/8388608LL;
+
+	//Second order compensation
+	if ( _model == MS5837_02BA ) {
+		if((TEMP/100)<20){         //Low temp
+			Ti = (11*int64_t(dT)*int64_t(dT))/(34359738368LL);
+			OFFi = (31*(TEMP-2000)*(TEMP-2000))/8;
+			SENSi = (63*(TEMP-2000)*(TEMP-2000))/32;
+		}
+	} else {
+		if((TEMP/100)<20){         //Low temp
+			Ti = (3*int64_t(dT)*int64_t(dT))/(8589934592LL);
+			OFFi = (3*(TEMP-2000)*(TEMP-2000))/2;
+			SENSi = (5*(TEMP-2000)*(TEMP-2000))/8;
+			if((TEMP/100)<-15){    //Very low temp
+				OFFi = OFFi+7*(TEMP+1500l)*(TEMP+1500l);
+				SENSi = SENSi+4*(TEMP+1500l)*(TEMP+1500l);
+			}
+		}
+		else if((TEMP/100)>=20){    //High temp
+			Ti = 2*(dT*dT)/(137438953472LL);
+			OFFi = (1*(TEMP-2000)*(TEMP-2000))/16;
+			SENSi = 0;
+		}
+	}
+
+	OFF2 = OFF-OFFi;           //Calculate pressure and temp second order
+	SENS2 = SENS-SENSi;
+
+	TEMP = (TEMP-Ti);
+
+	if ( _model == MS5837_02BA ) {
+		P = (((D1_pres*SENS2)/2097152l-OFF2)/32768l);
+	} else {
+		P = (((D1_pres*SENS2)/2097152l-OFF2)/8192l);
+	}
+}
+
+float MS5837::pressure(float conversion) {
+	if ( _model == MS5837_02BA ) {
+		return P*conversion/100.0f;
+	}
+	else {
+		return P*conversion/10.0f;
+	}
+}
+
+float MS5837::temperature() {
+	return TEMP/100.0f;
+}
+
+// The pressure sensor measures absolute pressure, so it will measure the atmospheric pressure + water pressure
+// We subtract the atmospheric pressure to calculate the depth with only the water pressure
+// The average atmospheric pressure of 101300 pascal is used for the calcuation, but atmospheric pressure varies
+// If the atmospheric pressure is not 101300 at the time of reading, the depth reported will be offset
+// In order to calculate the correct depth, the actual atmospheric pressure should be measured once in air, and
+// that value should subtracted for subsequent depth calculations.
+float MS5837::depth() {
+	return (pressure(MS5837::Pa)-101300)/(fluidDensity*9.80665);
+}
+
+float MS5837::altitude() {
+	return (1-pow((pressure()/1013.25),.190284))*145366.45*.3048;
+}
+
+
+uint8_t MS5837::crc4(uint16_t n_prom[]) {
+	uint16_t n_rem = 0;
+
+	n_prom[0] = ((n_prom[0]) & 0x0FFF);
+	n_prom[7] = 0;
+
+	for ( uint8_t i = 0 ; i < 16; i++ ) {
+		if ( i%2 == 1 ) {
+			n_rem ^= (uint16_t)((n_prom[i>>1]) & 0x00FF);
+		} else {
+			n_rem ^= (uint16_t)(n_prom[i>>1] >> 8);
+		}
+		for ( uint8_t n_bit = 8 ; n_bit > 0 ; n_bit-- ) {
+			if ( n_rem & 0x8000 ) {
+				n_rem = (n_rem << 1) ^ 0x3000;
+			} else {
+				n_rem = (n_rem << 1);
+			}
+		}
+	}
+
+	n_rem = ((n_rem >> 12) & 0x000F);
+
+	return n_rem ^ 0x00;
+}

lib/lib_i2c/BlueRobotics_MS5837_Library/MS5837.h

@@ -0,0 +1,113 @@
+/* Blue Robotics Arduino MS5837-30BA Pressure/Temperature Sensor Library
+------------------------------------------------------------
+
+Title: Blue Robotics Arduino MS5837-30BA Pressure/Temperature Sensor Library
+
+Description: This library provides utilities to communicate with and to
+read data from the Measurement Specialties MS5837-30BA pressure/temperature
+sensor.
+
+Authors: Rustom Jehangir, Blue Robotics Inc.
+         Adam Šimko, Blue Robotics Inc.
+
+-------------------------------
+The MIT License (MIT)
+
+Copyright (c) 2015 Blue Robotics Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+-------------------------------*/
+
+#ifndef MS5837_H_BLUEROBOTICS
+#define MS5837_H_BLUEROBOTICS
+
+#include "Arduino.h"
+#include <Wire.h>
+
+class MS5837 {
+public:
+	static const float Pa;
+	static const float bar;
+	static const float mbar;
+
+	static const uint8_t MS5837_30BA;
+	static const uint8_t MS5837_02BA;
+	static const uint8_t MS5837_UNRECOGNISED;
+
+	MS5837();
+
+	bool init(TwoWire &wirePort = Wire);
+	bool begin(TwoWire &wirePort = Wire); // Calls init()
+
+	/** Set model of MS5837 sensor. Valid options are MS5837::MS5837_30BA (default)
+	 * and MS5837::MS5837_02BA.
+	 */
+	void setModel(uint8_t model);
+	uint8_t getModel();
+
+	/** Provide the density of the working fluid in kg/m^3. Default is for
+	 * seawater. Should be 997 for freshwater.
+	 */
+	void setFluidDensity(float density);
+
+	/** The read from I2C takes up to 40 ms, so use sparingly is possible.
+	 */
+	void read();
+
+	/** Pressure returned in mbar or mbar*conversion rate.
+	 */
+	float pressure(float conversion = 1.0f);
+
+	/** Temperature returned in deg C.
+	 */
+	float temperature();
+
+	/** Depth returned in meters (valid for operation in incompressible
+	 *  liquids only. Uses density that is set for fresh or seawater.
+	 */
+	float depth();
+
+	/** Altitude returned in meters (valid for operation in air only).
+	 */
+	float altitude();
+
+	uint8_t crc4(uint16_t n_prom[]);
+
+private:
+
+	//This stores the requested i2c port
+	TwoWire * _i2cPort;
+
+	uint16_t C[8];
+	uint32_t D1_pres, D2_temp;
+	int32_t TEMP;
+	int32_t P;
+	uint8_t _model;
+
+	float fluidDensity;
+
+	/** Performs calculations per the sensor data sheet for conversion and
+	 *  second order compensation.
+	 */
+	void calculate();
+
+	//uint8_t crc4(uint16_t n_prom[]);
+};
+
+#endif

tasmota/include/tasmota_configurations.h

@@ -168,6 +168,7 @@
 //#define USE_LUXV30B                            // [I2CDriver70] Enable RFRobot SEN0390 LuxV30b ambient light sensor (I2C address 0x4A) (+0k5 code)
 //#define USE_PMSA003I                           // [I2cDriver78] Enable PMSA003I Air Quality Sensor (I2C address 0x12) (+1k8 code)
 //#define USE_GDK101                             // [I2cDriver79] Enable GDK101 sensor (I2C addresses 0x18 - 0x1B) (+1k2 code)
+#define USE_MS5837
 
 //#define USE_RTC_CHIPS                          // Enable RTC chip support and NTP server - Select only one
 //  #define USE_DS3231                           // [I2cDriver26] Enable DS3231 RTC (I2C address 0x68) (+1k2 code)

tasmota/include/tasmota_configurations_ESP32.h

@@ -476,6 +476,7 @@
 //#define USE_LUXV30B                            // [I2CDriver70] Enable RFRobot SEN0390 LuxV30b ambient light sensor (I2C address 0x4A) (+0k5 code)
 //#define USE_PMSA003I                           // [I2cDriver78] Enable PMSA003I Air Quality Sensor (I2C address 0x12) (+1k8 code)
 //#define USE_GDK101                             // [I2cDriver79] Enable GDK101 sensor (I2C addresses 0x18 - 0x1B) (+1k2 code)
+#define USE_MS5837
 
 //#define USE_RTC_CHIPS                          // Enable RTC chip support and NTP server - Select only one
 //  #define USE_DS3231                           // [I2cDriver26] Enable DS3231 RTC (I2C address 0x68) (+1k2 code)
@@ -712,6 +713,7 @@
 //#define USE_LUXV30B                            // [I2CDriver70] Enable RFRobot SEN0390 LuxV30b ambient light sensor (I2C address 0x4A) (+0k5 code)
 //#define USE_PMSA003I                           // [I2cDriver78] Enable PMSA003I Air Quality Sensor (I2C address 0x12) (+1k8 code)
 //#define USE_GDK101                             // [I2cDriver79] Enable GDK101 sensor (I2C addresses 0x18 - 0x1B) (+1k2 code)
+#define USE_MS5837
 
 //#define USE_RTC_CHIPS                          // Enable RTC chip support and NTP server - Select only one
 //  #define USE_DS3231                           // [I2cDriver26] Enable DS3231 RTC (I2C address 0x68) (+1k2 code)