I'm wondering if this is a valid use case. I need to perform both a
multiplication and a subtraction to compute an original voltage.
lm sensors 3.2.0 is working fine on Linux 2.6.39.4 reading an ADS1115 ADC
chip that measures a voltage from 0 V to about 2 V.
# uname -srmo
Linux 2.6.39.4 armv5tejl GNU/Linux
# sensors --version
sensors version 3.2.0 with libsensors version 3.2.0
# sensors --bus-list ads1115-i2c-2-4a
bus "i2c-2" "i2c-1-mux (chan_id 0)"
bus "i2c-1" "DaVinci I2C adapter"
# sensors --no-adapter ads1115-i2c-2-4a
ads1115-i2c-2-4a
in4: +1.14 V
in5: +1.14 V
in6: +1.14 V
My problem is that I'd like for the sensor utility to convert the ADC
voltages to the original voltage which are in the range from about -10 V to
about +10 V.
If I modify the sensor configuration as follows, it appears to work
correctly.
root@centaur-3_0009:~# tail -2 /etc/sensors3.conf
chip "ads1115-*"
compute in4 @*10-10 , (@+10)*10
root@centaur-3_0009:~# sensors --no-adapter ads1115-i2c-2-4a
ads1115-i2c-2-4a
in4: +1.41 V
in5: +1.14 V
in6: +1.14 V
Unfortunately when I adjust the values to their more accurate values, it no
longer converts and reports the original ADC value instead.
root@centaur-3_0009:~# tail -2 /etc/sensors3.conf
chip "ads1115-*"
compute in4 @*9.72340425532-9.95823902214 ,
(@+9958.23902214)/9.72340425532
root@centaur-3_0009:~# sensors --no-adapter ads1115-i2c-2-4a
ads1115-i2c-2-4a
in4: +1.14 V
in5: +1.14 V
in6: +1.14 V
--
Chris
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