On Fri, Aug 22, 2014 at 06:31:22PM -0400, Christopher Cordahi wrote: > 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 Maybe the sensors command gets confused with the number of digits. Can you try with less accuracy ? Guenter _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
