Hello again,
I am currently using an LM335 temperature sensor to detect temperatures in the range of -40 deg Celsius to 30 deg Celsius. It is currently tuned with a pot to where it outputs 2.8volts at 30 deg Celsius. This is the lowest I can get it to output with the pot; the problem with that is the Vref on my Atmel 8951 is 2.8volts. So what I would like to do is shift the voltage down 2.1volts (The 2.1volts comes from the sensor being rated at 10mv/deg C; so if I'm going down to -40deg Celsius from +30 that's a difference of 700mv so the lowest voltage it will currently output is 2.1volts)
By shifting the voltage down 2.1volts, I can then send the output through an amplifier to create an output of 2.8volts again at 30 deg Celsius but now I will be using 0 to 2.8volts instead of 2.1 to 2.8 volts which gives much better resolution. How can this be achieved? Are there other ways to improve the resolution?
Thanks, Trent
I am currently using an LM335 temperature sensor to detect temperatures in the range of -40 deg Celsius to 30 deg Celsius. It is currently tuned with a pot to where it outputs 2.8volts at 30 deg Celsius. This is the lowest I can get it to output with the pot; the problem with that is the Vref on my Atmel 8951 is 2.8volts. So what I would like to do is shift the voltage down 2.1volts (The 2.1volts comes from the sensor being rated at 10mv/deg C; so if I'm going down to -40deg Celsius from +30 that's a difference of 700mv so the lowest voltage it will currently output is 2.1volts)
By shifting the voltage down 2.1volts, I can then send the output through an amplifier to create an output of 2.8volts again at 30 deg Celsius but now I will be using 0 to 2.8volts instead of 2.1 to 2.8 volts which gives much better resolution. How can this be achieved? Are there other ways to improve the resolution?
Thanks, Trent