Arduino Lab 4: Thermometer

Background: From our circuit labs, we remember that a thermistor is a variable resistor that changes based on the temperature. We can use this property to read a change in voltage across the thermistor and compute a corresponding temperature value to take our patient's temperature.

Goal: Read a thermistor and compute the temperature.

 

Circuit Setup

• Materials
  • 1x NTC Thermistor
  • 1x 10 kOhm Resistor
• Setup
  
  • Connect thermistor between 5V and A0.
  • Connect resistor between A0 and GND.

 

Lab Instructions

• Make a copy of the starter code below.
• Configure serial port to be used.
  • We will print temperature values to user every second.
  • Use Serial.print() and Serial.println() to format output.
    
    • Serial.print(temp);
    • Serial.println(“ degrees Fahrenheit”);
• Use analogRead() to read analog voltage in circuit.
  
  • Provides a value between 0-1023 corresponding to a voltage.
  • Store this value to a variable, so you can use it to compute temp.
• Once you’ve retrieved the value via analogRead(), use the starter code below to compute the temperature in Celsius using Steinhardt-Hart Equation.
  
  • The circuit and math knowledge required to compute this is quite complex, so I provided the equation.
• You will then need to convert the temperature from Celsius to Fahrenheit to display the resulting temperatures as shown.
  

 

https://create.arduino.cc/editor/mjdargen_ncsu/48404ded-26b4-45b5-992e-8fc7ab0f3f3e/preview