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DPS.py
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import smbus
from time import sleep
def getTwosComplement(raw_val, length):
"""Get two's complement of `raw_val`.
Args:
raw_val (int): Raw value
length (int): Max bit length
Returns:
int: Two's complement
"""
val = raw_val
if raw_val & (1 << (length - 1)):
val = raw_val - (1 << length)
return val
class DPS:
"""Class of DPS, Pressure and Temperature sensor.
"""
__bus = smbus.SMBus(1)
__addr = 0x77
# Compensation Scale Factors
# Oversampling Rate | Scale Factor (kP or kT)
# ---------------------------|------------------------
# 1 (single) | 524288
# 2 times (Low Power) | 1572864
# 4 times | 3670016
# 8 times | 7864320
# 16 times (Standard) | 253952
# 32 times | 516096
# 64 times (High Precision) | 1040384 <- Configured
# 128 times | 2088960
__kP = 1040384
__kT = 1040384
def __init__(self):
"""Initial setting.
Execute `self.correctTemperature()` and `self.setOversamplingRate()`.
"""
self.__correctTemperature()
self.__setOversamplingRate()
def __correctTemperature(self):
"""Correct temperature.
DPS sometimes indicates a temperature over 60 degree Celsius
although room temperature is around 20-30 degree Celsius.
Call this function to fix.
"""
# Correct Temp
DPS.__bus.write_byte_data(DPS.__addr, 0x0E, 0xA5)
DPS.__bus.write_byte_data(DPS.__addr, 0x0F, 0x96)
DPS.__bus.write_byte_data(DPS.__addr, 0x62, 0x02)
DPS.__bus.write_byte_data(DPS.__addr, 0x0E, 0x00)
DPS.__bus.write_byte_data(DPS.__addr, 0x0F, 0x00)
def __setOversamplingRate(self):
"""Set oversampling rate.
Pressure measurement rate : 4 Hz
Pressure oversampling rate : 64 times
Temperature measurement rate : 4 Hz
Temperature oversampling rate: 64 times
"""
# Oversampling Rate Setting (64time)
DPS.__bus.write_byte_data(DPS.__addr, 0x06, 0x26)
DPS.__bus.write_byte_data(DPS.__addr, 0x07, 0xA6)
DPS.__bus.write_byte_data(DPS.__addr, 0x08, 0x07)
# Oversampling Rate Configuration
DPS.__bus.write_byte_data(DPS.__addr, 0x09, 0x0C)
def __getRawPressure(self):
"""Get raw pressure from sensor.
Returns:
int: Raw pressure
"""
p1 = DPS.__bus.read_byte_data(DPS.__addr, 0x00)
p2 = DPS.__bus.read_byte_data(DPS.__addr, 0x01)
p3 = DPS.__bus.read_byte_data(DPS.__addr, 0x02)
p = (p1 << 16) | (p2 << 8) | p3
p = getTwosComplement(p, 24)
return p
def __getRawTemperature(self):
"""Get raw temperature from sensor.
Returns:
int: Raw temperature
"""
t1 = DPS.__bus.read_byte_data(DPS.__addr, 0x03)
t2 = DPS.__bus.read_byte_data(DPS.__addr, 0x04)
t3 = DPS.__bus.read_byte_data(DPS.__addr, 0x05)
t = (t1 << 16) | (t2 << 8) | t3
t = getTwosComplement(t, 24)
return t
def __getPressureCalibrationCoefficients(self):
"""Get pressure calibration coefficients from sensor.
Returns:
int: Pressure calibration coefficient (c00)
int: Pressure calibration coefficient (c10)
int: Pressure calibration coefficient (c20)
int: Pressure calibration coefficient (c30)
int: Pressure calibration coefficient (c01)
int: Pressure calibration coefficient (c11)
int: Pressure calibration coefficient (c21)
"""
src13 = DPS.__bus.read_byte_data(DPS.__addr, 0x13)
src14 = DPS.__bus.read_byte_data(DPS.__addr, 0x14)
src15 = DPS.__bus.read_byte_data(DPS.__addr, 0x15)
src16 = DPS.__bus.read_byte_data(DPS.__addr, 0x16)
src17 = DPS.__bus.read_byte_data(DPS.__addr, 0x17)
src18 = DPS.__bus.read_byte_data(DPS.__addr, 0x18)
src19 = DPS.__bus.read_byte_data(DPS.__addr, 0x19)
src1A = DPS.__bus.read_byte_data(DPS.__addr, 0x1A)
src1B = DPS.__bus.read_byte_data(DPS.__addr, 0x1B)
src1C = DPS.__bus.read_byte_data(DPS.__addr, 0x1C)
src1D = DPS.__bus.read_byte_data(DPS.__addr, 0x1D)
src1E = DPS.__bus.read_byte_data(DPS.__addr, 0x1E)
src1F = DPS.__bus.read_byte_data(DPS.__addr, 0x1F)
src20 = DPS.__bus.read_byte_data(DPS.__addr, 0x20)
src21 = DPS.__bus.read_byte_data(DPS.__addr, 0x21)
c00 = (src13 << 12) | (src14 << 4) | (src15 >> 4)
c00 = getTwosComplement(c00, 20)
c10 = ((src15 & 0x0F) << 16) | (src16 << 8) | src17
c10 = getTwosComplement(c10, 20)
c20 = (src1C << 8) | src1D
c20 = getTwosComplement(c20, 16)
c30 = (src20 << 8) | src21
c30 = getTwosComplement(c30, 16)
c01 = (src18 << 8) | src19
c01 = getTwosComplement(c01, 16)
c11 = (src1A << 8) | src1B
c11 = getTwosComplement(c11, 16)
c21 = (src1E << 8) | src1F
c21 = getTwosComplement(c21, 16)
return c00, c10, c20, c30, c01, c11, c21
def __getTemperatureCalibrationCoefficients(self):
"""Get temperature calibration coefficients from sensor.
Returns:
int: Temperature calibration coefficient (c0)
int: Temperature calibration coefficient (c1)
"""
src10 = DPS.__bus.read_byte_data(DPS.__addr, 0x10)
src11 = DPS.__bus.read_byte_data(DPS.__addr, 0x11)
src12 = DPS.__bus.read_byte_data(DPS.__addr, 0x12)
c0 = (src10 << 4) | (src11 >> 4)
c0 = getTwosComplement(c0, 12)
c1 = ((src11 & 0x0F) << 8) | src12
c1 = getTwosComplement(c1, 12)
return c0, c1
def calcScaledPressure(self):
"""Calculate scaled pressure.
Returns:
float: Scaled pressure
"""
raw_p = self.__getRawPressure()
scaled_p = raw_p / DPS.__kP
return scaled_p
def calcScaledTemperature(self):
"""Calculate scaled temperature.
Returns:
float: Scaled temperature
"""
raw_t = self.__getRawTemperature()
scaled_t = raw_t / DPS.__kT
return scaled_t
def calcCompTemperature(self, scaled_t):
"""Calculate compensated temperature.
Args:
scaled_t (float): Scaled temperature
Returns:
float: Compensated temperature [C]
"""
c0, c1 = self.__getTemperatureCalibrationCoefficients()
comp_t = c0 * 0.5 + scaled_t * c1
return comp_t
def calcCompPressure(self, scaled_p, scaled_t):
"""Calculate compensated pressure.
Args:
scaled_p (float): Scaled pressure
scaled_t (float): Scaled temperature
Returns:
float: Compensated pressure [Pa]
"""
c00, c10, c20, c30, c01, c11, c21 = self.__getPressureCalibrationCoefficients()
comp_p = (c00 + scaled_p * (c10 + scaled_p * (c20 + scaled_p * c30))
+ scaled_t * (c01 + scaled_p * (c11 + scaled_p * c21)))
return comp_p
def measureTemperatureOnce(self):
"""Measures compensated temperature once.
Returns:
float:One compensated temperature value [C]
"""
t= self.calcScaledTemperature()
temperature=self.calcCompTemperature(t)
return temperature
def measurePressureOnce(self):
"""Measure compensated pressure once.
Returns:
float:One Compensated pressure value [Pa]
"""
p = self.calcScaledPressure()
t= self.calcScaledTemperature()
pressure =self.calcCompPressure(p, t)
return pressure
class DPS422:
"""Class of DPS422, Pressure and Temperature sensor.
"""
__bus = smbus.SMBus(1)
__addr = 0x77
# Compensation Scale Factors
# Oversampling Rate | Scale Factor (kP or kT)
# ---------------------------|------------------------
# 1 (single) | 524288
# 2 times (Low Power) | 1572864
# 4 times | 3670016
# 8 times | 7864320
# 16 times (Standard) | 253952
# 32 times | 516096
# 64 times (High Precision) | 1040384 <- Configured
# 128 times | 2088960
__kP = 1040384
__kT = 1040384
DPS422_A_0 = 5030
DPS422_T_REF = 27
DPS422_T_C_VBE = -1.735e-3
DPS422_V_BE_TARGET = 0.687027
DPS422_K_PTAT_CORNER = -0.8
DPS422_K_PTAT_CURVATURE = 0.039
DPS422_ALPHA = 9.45
def __init__(self):
"""Initial setting.
Execute `self.correctTemperature()` and `self.setOversamplingRate()`.
"""
self.__correctTemperature()
self.__setOversamplingRate()
def __correctTemperature(self):
"""Correct temperature.
DPS422 sometimes indicates a temperature over 60 degree Celsius
although room temperature is around 20-30 degree Celsius.
Call this function to fix.
"""
# Correct Temp
DPS422.__bus.write_byte_data(DPS422.__addr, 0x0E, 0xA5)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x0F, 0x96)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x62, 0x02)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x0E, 0x00)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x0F, 0x00)
def __setOversamplingRate(self):
"""Set oversampling rate.
Pressure measurement rate : 4 Hz
Pressure oversampling rate : 64 times
Temperature measurement rate : 4 Hz
Temperature oversampling rate: 64 times
"""
# Oversampling Rate Setting (64time)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x06, 0x26)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x07, 0xA6)
DPS422.__bus.write_byte_data(DPS422.__addr, 0x08, 0x07)
# Oversampling Rate Configuration
DPS422.__bus.write_byte_data(DPS422.__addr, 0x09, 0x0C)
def __getRawPressure(self):
"""Get raw pressure from sensor.
Returns:
int: Raw pressure
"""
p1 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x00)
p2 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x01)
p3 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x02)
p = (p1 << 16) | (p2 << 8) | p3
p = getTwosComplement(p, 24)
return p
def __getRawTemperature(self):
"""Get raw temperature from sensor.
Returns:
int: Raw temperature
"""
t1 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x03)
t2 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x04)
t3 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x05)
t = (t1 << 16) | (t2 << 8) | t3
t = getTwosComplement(t, 24)
return t
def __getPressureCalibrationCoefficients(self):
"""Get pressure calibration coefficients from sensor.
Returns:
int: Pressure calibration coefficient (c00)
int: Pressure calibration coefficient (c10)
int: Pressure calibration coefficient (c01)
int: Pressure calibration coefficient (c02)
int: Pressure calibration coefficient (c20)
int: Pressure calibration coefficient (c30)
int: Pressure calibration coefficient (c11)
int: Pressure calibration coefficient (c12)
int: Pressure calibration coefficient (c21)
"""
src26 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x26)
src27 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x27)
src28 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x28)
src29 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x29)
src2A = DPS422.__bus.read_byte_data(DPS422.__addr, 0x2A)
src2B = DPS422.__bus.read_byte_data(DPS422.__addr, 0x2B)
src2C = DPS422.__bus.read_byte_data(DPS422.__addr, 0x2C)
src2D = DPS422.__bus.read_byte_data(DPS422.__addr, 0x2D)
src2E = DPS422.__bus.read_byte_data(DPS422.__addr, 0x2E)
src2F = DPS422.__bus.read_byte_data(DPS422.__addr, 0x2F)
src30 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x30)
src31 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x31)
src32 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x32)
src33 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x33)
src34 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x34)
src35 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x35)
src36 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x36)
src37 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x37)
src38 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x38)
src39 = DPS422.__bus.read_byte_data(DPS422.__addr, 0x39)
c00 = (src26 << 12) | (src27 << 4) | (src28 >> 4)
c10 = ((src28 & 0x0F) << 16) | (src29 <<8) | src2A
c01 = (src2B << 12) | (src2C << 4) | ((src2D & 0xF0) >> 4)
c02 = ((src2D & 0x0F) << 16) | (src2E <<8) | src2F
c20 = ((src30 & 0x7F) << 8) | src34
c30 = ((src32 & 0x0F) << 8) | src33
c11 = (src34 << 9) | (src35 << 1) | ((src36 & 0x80) >>7)
c12 = ((src36 & 0x7F) << 10) | (src37 << 2) | ((src38 & 0xC0) >> 6)
c21 = ((src38 & 0x7F) << 8) | src39
c00 = getTwosComplement(c00, 20)
c01 = getTwosComplement(c01, 20)
c02 = getTwosComplement(c02, 20)
c10 = getTwosComplement(c10, 20)
c11 = getTwosComplement(c11, 17)
c12 = getTwosComplement(c12, 17)
c20 = getTwosComplement(c20, 15)
c21 = getTwosComplement(c21, 14)
c30 = getTwosComplement(c30, 12)
return c00, c01, c02, c10, c11, c12, c20, c21, c30
def __getTemperatureCalibrationCoefficients(self):
"""Get temperature calibration coefficients from sensor.
Returns:
float : Temperature calibration coefficient (a_prime)
float : Temperature calibration coefficient (a_prime)
"""
#read T_Gain, T_Vbe and T_dVbe
T_Gain = DPS422.__bus.read_byte_data(DPS422.__addr, 0x20)
T_dVBE_Coeff = DPS422.__bus.read_byte_data(DPS422.__addr, 0x21)
T_VBE_Coeff = DPS422.__bus.read_byte_data(DPS422.__addr, 0x22)
T_dVbe = T_dVBE_Coeff >> 1
T_Vbe = (T_dVBE_Coeff & 0x01) | (T_VBE_Coeff << 1)
T_Gain = getTwosComplement(T_Gain, 8)
T_dVbe = getTwosComplement(T_dVbe, 7)
T_Vbe = getTwosComplement(T_Vbe, 9)
#Vbe, dVbe and Aadc
Vbe = T_Vbe * 1.05031e-4 + 0.463232422
dVbe = T_dVbe * 1.25885e-5 + 0.04027621
Aadc = T_Gain * 8.4375e-5 + 0.675
#Vbe_cal and dVbe_cal
Vbe_cal = Vbe / Aadc
dVbe_cal = dVbe / Aadc
#T_calib
T_calib = DPS422.DPS422_A_0 * dVbe_cal - 273.15
#Vbe_cal(T_ref): Vbe value at reference temperature
Vbe_cal_tref = Vbe_cal - (T_calib - DPS422.DPS422_T_REF) * DPS422.DPS422_T_C_VBE
#calculate PTAT correction coefficient
k_ptat = (DPS422.DPS422_V_BE_TARGET - Vbe_cal_tref) * DPS422.DPS422_K_PTAT_CORNER + DPS422.DPS422_K_PTAT_CURVATURE
#calculate A_Prime and B_Prime
a_prime = DPS422.DPS422_A_0 * (Vbe_cal + DPS422.DPS422_ALPHA * dVbe_cal) * (1 + k_ptat)
b_prime = -273.15 * (1 + k_ptat) - k_ptat * T_calib
return a_prime, b_prime
def calcScaledPressure(self):
"""Calculate scaled pressure.
Returns:
float: Scaled pressure
"""
raw_p = self.__getRawPressure()
scaled_p = raw_p / DPS422.__kP
return scaled_p
def calcScaledTemperature(self):
"""Calculate scaled temperature.
Returns:
float: Scaled temperature
"""
raw_t = self.__getRawTemperature()
scaled_t = raw_t / DPS422.__kT
return scaled_t
def calcCompTemperature(self, scaled_t):
"""Calculate compensated temperature.
Args:
scaled_t (float): Scaled temperature
Returns:
float: Compensated temperature [C]
"""
a_prime, b_prime = self.__getTemperatureCalibrationCoefficients()
u = scaled_t / (1 + DPS422.DPS422_ALPHA * scaled_t)
return (a_prime * u + b_prime)
def calcCompPressure(self, scaled_p, scaled_t):
"""Calculate compensated pressure.
Args:
scaled_p (float): Scaled pressure
scaled_t (float): Scaled temperature
Returns:
float: Compensated pressure [Pa]
"""
c00, c01, c02, c10, c11, c12, c20, c21, c30 = self.__getPressureCalibrationCoefficients()
temp = (8.5 * scaled_t) / (1 + 8.8 * scaled_t)
comp_p = c00 +(c10 *scaled_p) + (c01 * temp )+ (c20 * scaled_p *scaled_p) + (c02 *temp *temp) + (c30 *scaled_p *scaled_p * scaled_p) + (c11 *temp * scaled_p) + (c12 * scaled_p *temp *temp) + (c21 * scaled_p *scaled_p *temp)
return comp_p
def measureBothOnce(self):
""" measures compensated temperature and compensated pressure once
Returns:
float: Compensated Temperature
float: Compensated Pressure
"""
t = self.calcScaledTemperature()
temp = self.calcCompTemperature(t)
p = self.calcScaledPressure()
pressure = self.calcCompPressure(p, t)
return temp, pressure