I was having major problems with my thermistor because I didn't have the proper Arduino code that uses the Steinhart-Hart function. Note: Step two is crucial to obtaining the correct A, B, & C coefficients to re-enter into the code. It’s a versatile tool and an excellent choice for prototyping projects. Because we were looking for the most accurate temperature reading between a range of 20 ˚C and 30 ˚C, we chose the ACC-001 from Ametherm’s line of ACCU-CURVE Precision Interchangeable thermistor temperature sensors. Should the results fall short of your expectations, here are some tips and tricks: If you do find errors in your calculations, re-enter the coefficients into the Steinhart-Hart calculator then paste the correct A, B, and C coefficients into the code. Thanks for reading! Since 1994, Ametherm has provided the most reliable and effective inrush current limiting solutions available. You can connect the Arduino to the IDE on the computer once you have the correct code. If the displayed temperature reading is not what you expected, we recommend that you double-check your coefficient values to see that you correctly pasted them into the A, B, and C coefficient fields in the code. The analog input pins of the Arduino can only measure voltage, so the electrical resistance of a thermistor cannot be measured directly1. + LCD/OLED can be used to measure body temperature or to detect movement... in Celsius and Fahrenheit! Pay close attention to the variable resistor requirement notes on the left as to avoid any errors due to a mismatched NTC thermistor temperature sensor and the variable resistor. If it’s 340, 000 Ohms, it’s a 100K thermsitor. They are mainly used for low-temperature range but not for high temperatures. We show you how to set up and wire your Arduino, and we show you how to program the Arduino to get an accurate room temperature reading via an LCD display. Now it shows a much more reasonable temperature! Visit Arduino.org for more information. After connecting the circuit above, upload this code to your Arduino to output the temperature readings to the serial monitor in Fahrenheit: To output the temperature readings to a 16X2 LCD. In Negative Temperature Coefficient (NTC) thermistors, resistance decreases with an increase in temperature. The Single Part Solution, NTC Thermistor Temperature Sensors Provide Li-Ion Battery Safety, Design Guidelines for a Power Factor Correction (PFC) Circuit Using a Capacitor and an NTC Thermistor, Thermal Time Constant and NTC Thermistors: A Practical Study, Temperature Sensors – Thermistors versus Thermocouples, Alternative Energy Applications for MS35 Inrush Current Limiters, How to Select the Optimal Temperature Sensor, 4 Most Common Types of Temperature Sensor, Visit Ametherm’s NTC Thermistors Steinhart & Hart page, ACCU-CURVE™ Thermistors for High Accuracy Temperature Sensing, Glass-Encapsulated Thermistors For Automotive and Industrial Applications, Inverter Pre-Charge Circuit Inrush Current, The Secret To Successful Thermistor Beta Calculations, NTC Thermistor Calculating the Temperature Coefficient of a Thermistor, MM35-DIN Series for High Power Inrush Current Applications, PTC Thermistors vs. NTC Thermistors for Inrush Current, Transformer Inrush Current: Limiting a 40VA Transformer, Inrush Protection for a Precharge Circuit on Lithium Ion Batteries. We have a dedicated Steinhart & Hart calculator on our website for your use as well. A beginner-tier project I hope will help the fellows that are newbies in the Arduino world! This series of NTC thermistors carries a high accuracy rating of ±.2 °C making them an excellent choice for our project. We were targeting a temperature range between 20 ˚C and 30 ˚C. We show you how to set up and wire your Arduino, and we show you how to program the Arduino to get an accurate room temperature reading via an LCD display. Where: e is the base of natural logarithm ; R0 is the resistance of the thermistor measured at the temperature T0; B is a constant coefficient that depends on the characteristics of the material, it is a constant expressed in K, and its value is indicated by the manufacturers on the technical sheets; To calculate the temperature we need know the resistance RT using the Ohm's laws.
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