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Fixes for temperature conversion bugs issue #15. #16

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Merged
merged 1 commit into from
May 22, 2019
Merged

Fixes for temperature conversion bugs issue #15. #16

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12 changes: 9 additions & 3 deletions adafruit_amg88xx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@
# Operating Modes
# pylint: disable=bad-whitespace
_NORMAL_MODE = const(0x00)
_SLEEP_MODE = const(0x01)
_SLEEP_MODE = const(0x10)
_STAND_BY_60 = const(0x20)
_STAND_BY_10 = const(0x21)

Expand Down Expand Up @@ -86,10 +86,16 @@
def _signed_12bit_to_float(val):
#take first 11 bits as absolute val
abs_val = (val & 0x7FF)
if val & 0x8000:
if val & 0x800:
return 0 - float(abs_val)
return float(abs_val)

def _twos_comp_to_float(val):
val &= 0xfff
if val & 0x800:
val -= 0x1000
return float(val)

class AMG88XX:
"""Driver for the AMG88xx GRID-Eye IR 8x8 thermal camera."""

Expand Down Expand Up @@ -161,6 +167,6 @@ def pixels(self):
i2c.readinto(buf, start=1)

raw = (buf[2] << 8) | buf[1]
retbuf[row][col] = _signed_12bit_to_float(raw) * _PIXEL_TEMP_CONVERSION
retbuf[row][col] = _twos_comp_to_float(raw) * _PIXEL_TEMP_CONVERSION

return retbuf