Analog Temperature Sensor Calibration

[fyuan483]

The analog input determines both the voltage and the output temperature. Depending on what microcontroller board you are using: Arduino, Raspberry Pi, or TI Innovator, I could further help you figure out the process. However, to give you an idea to go about this using the TI Innovator, I suggest you look at: https://www.soinc.org/sites/default/fil ... cher_0.pdf

That website guides you along the process of calibration with the TI innovator, but you could easily apply this to the Arduino or Raspberry Pi.

actually, i read the example program 1 that gives the linear equation of analog input and temperature. but i am not really understanding how the voltage formula can be derived too. sorry for asking too much. thanks

This is where it matters what board you are using. If you are using a TI Innovator, the ADC used 14-bit, so the formula for converting the analog-in to voltages is

Code: Select all

(X/(2^14-1))*3.3

where X is the analog-in value.

If you are using Arduino, it has an ADC that uses 10-bit, so its formula would be

Code: Select all

(X/(2^10-1))*3.3

oh ok i understand now. thank you so much again.

[fyuan483]

hi. when i use hot glue to stick the temperature sensor in the straw, does the temperature sensor need to touch the water? thank you for the help.

[yashp13]

hi. when i use hot glue to stick the temperature sensor in the straw, does the temperature sensor need to touch the water? thank you for the help.

The temperature sensor does not need to touch the water, however, I would advise you to not layer it too much, as that can skew the temperature readings since part of it will get dissipated. Also, I would not recommend using hot glue but instead trying JB Weld or some type of waterproof silicone sealant that can handle hot temperatures.

[fyuan483]

hi. when i use hot glue to stick the temperature sensor in the straw, does the temperature sensor need to touch the water? thank you for the help.

The temperature sensor does not need to touch the water, however, I would advise you to not layer it too much, as that can skew the temperature readings since part of it will get dissipated. Also, I would not recommend using hot glue but instead trying JB Weld or some type of waterproof silicone sealant that can handle hot temperatures.

ok. thank you so much again!

[yashp13]

hi. when i use hot glue to stick the temperature sensor in the straw, does the temperature sensor need to touch the water? thank you for the help.

The temperature sensor does not need to touch the water, however, I would advise you to not layer it too much, as that can skew the temperature readings since part of it will get dissipated. Also, I would not recommend using hot glue but instead trying JB Weld or some type of waterproof silicone sealant that can handle hot temperatures.

ok. thank you so much again!

no problem!

[fyuan483]

hi i am sorry again but there is one equation to find the voltage, one to find the temperature, and another equation that converts voltage to temperature?

[fyuan483]

hi. for my y-intercept i do not get a value in the hundreds and i tried to use the points in the example to get their equation but it also didn’t work so i am confused now. can someone help me? thank you!

[fyuan483]

hi. i am not really sure on how to get the LED lights and their temperature ranges. i am using the LM19 with the ti innovator hub and the ti-84 plus ce calculator. can anyone give me some help or tips?