Thank you Guenter for your quick response and apologies for my slow response. Turns out I was the one confused. On Sat, Aug 23, 2014 at 3:11 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > 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 > -- Chris _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
