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Speed up temperature readings #47

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Jan 31, 2025
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Speed up temperature readings #47

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13 changes: 9 additions & 4 deletions adafruit_mlx90393.py
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Original file line number Diff line number Diff line change
Expand Up @@ -226,6 +226,8 @@ def __init__( # pylint: disable=too-many-arguments
self._osr = oversampling
self._gain_current = gain
self._temperature_compensation = temperature_compensation
# Typical value according the application note
self._tref = 0xB668
self._off_x = self._off_y = self._off_z = offset

# Put the device in a known state to start
Expand Down Expand Up @@ -519,6 +521,12 @@ def reset(self) -> None:
print("Resetting sensor")
time.sleep(0.002)
self._transceive(bytes([_CMD_RT]))

# Read the temperature reference from register 0x24
self._tref = self.read_reg(0x24)
if self._debug:
print("Tref = {}".format(hex(self._tref)))

# burn a read post reset
try:
self.magnetic
Expand Down Expand Up @@ -614,9 +622,6 @@ def temperature(self) -> float:
Reads a single temperature sample from the magnetometer.
Temperature value in Celsius
"""
# Read the temperature reference from register 0x24
treference = self.read_reg(0x24)

# Value taken from maximum time of temperature conversion on the datasheet section 12.
# maximum time for temperature conversion = 1603 us
delay = 0.1
Expand All @@ -637,4 +642,4 @@ def temperature(self) -> float:
tvalue = struct.unpack(">H", data[1:3])[0]
# See previous link for conversion formula

return 35 + ((tvalue - treference) / 45.2)
return 35 + ((tvalue - self._tref) / 45.2)