2 · Inputs & sensors
Thermistor: measuring temperature
Advanced25 min
Goal
Convert an NTC resistance into degrees Celsius.
Why it matters
Going from a physical quantity to a usable value requires a maths model (Steinhart-Hart / Beta).
What you need
- Arduino UNO board
Nothing to buy: every component below is simulated in the browser.
Steps
- 01Read the divider voltage on A0.
- 02Compute the resistance R = R0 · (1023/value − 1).
- 03Apply the Beta formula to get kelvins, then °C.
- 04Print the temperature.
This tutorial runs inside the Circuitly simulator: your wiring and your code are checked automatically at every step.
Frequently asked questions
- Do I need to buy hardware for this tutorial?
- No. Everything runs in the browser: Circuitly simulates the board, the components and the code. Real hardware is optional if you want to rebuild the circuit afterwards.
- Which components are used?
- Arduino UNO board. They are already available in the simulator library.
- How long does it take?
- About 25 minutes, advanced level, in 4 guided steps.
- What should I know before starting?
- The previous tutorial in the series, “Filter noise (moving average)”, is enough preparation. No software install is required.
- Is the code provided and checked?
- The simulator checks your wiring and your code automatically at every step, and shows the commented solution if you get stuck.
For teachers
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In the same series
- Read a push button
Light the LED only while the button is pressed.
- Toggle button (debounced)
One press turns on, the next turns off — with no contact bounce.
- Read a potentiometer
Print the analog value of A0 on the serial monitor.
- Convert to volts (map & float)
Turn the ADC's 0–1023 into a 0.00–5.00 V reading.