The NTC B3950 sensor is a thermistor that can be used with Arduino to accurately measure temperatures. Its behavior as a temperature-dependent resistor makes it ideal for projects where you need to know thermal variations accurately. By using this sensor together with platforms such as Arduino, you can use measurement and control resources to design home or industrial automation systems.
If you are interested in how a B3950NTC could be integrated with an Arduino, here we tell you everything you need to know, from its installation to obtaining useful readings for your projects.
What is NTC B3950 sensor?
The NTC B3950 sensor is a negative temperature coefficient thermistor, meaning that its resistance decreases as the temperature increases. This type of sensor is widely used in temperature control and thermometry applications due to its high accuracy and low cost.
The B3950NTC is particularly popular because its resistance-temperature curve is well known, making it easy to implement with microcontrollers such as Arduino. This sensor features a common resistance value of 10kΩ at 25°C.
Preparing the necessary material
To get started, you will need the following:
- Arduino UNO (or other model): Necessary to receive and process the data sent by the sensor.
- NTC thermistor B3950: Sensor that measures temperature based on the variation of its resistance.
- 10kΩ resistor: Together with the thermistor, it acts as a voltage divider.
- Connection cables and breadboard: To connect the sensor and components to the Arduino.
Connecting the B3950NTC to the Arduino
Connecting the B3950NTC sensor to your Arduino board is pretty easy. Basically, you need to create a voltage divider using the thermistor and the 10kΩ resistor. Here's how to do it:
- Connect one pin of the thermistor to the 5V of the Arduino.
- The other pin of the thermistor should go to one end of the 10kΩ resistor and to an analog pin (e.g. A0) on the Arduino.
- The other end of the resistor connects to GND.
This type of voltage divider setup will allow the Arduino to measure the voltage drop across the resistor as the temperature changes. This voltage is then translated into a temperature measurement using a formula or table specific to the NTC sensor.
Arduino programming
Once you have made the connections, the next step is to write the code to read the sensor data. A basic code example for this purpose could look like this:
int sensorPin = A0;
float resistance;
float temperature;
void setup() {
Serial.begin(9600);
}
void loop() {
int reading = analogRead(sensorPin);
resistance = (1023.0 / (float)reading - 1) * 10000; // Calcular resistencia
temperature = 1 / (log(resistance / 10000) / 3950 + 1 / 298.15) - 273.15; // Calcular la temperatura en grados Celsius
Serial.println(temperature);
delay(1000);
}
The above code does the following:
- Read the value of analog pin A0: This provides a voltage reading proportional to the resistance of the NTC sensor.
- Turn reading into resistance: Using the voltage divider equation.
- Converts resistance into temperature: This is done using the Steinhart-Hart equation for NTCs, which gives the corresponding temperature readings.
This code will allow you to read the variations and display the temperature in degrees Celsius on the console.
Practical applications of the NTC B3950 with Arduino
The NTC B3950 sensor can be widely used in any project where temperature measurement or control is required. Some applications include:
- Homemade weather stations: Allows you to measure the temperature outside or in a specific environment.
- Thermal control systems: To activate fans or cooling systems depending on the temperature.
- Incubator projects: Where the temperature must remain constant for the development of living beings.
Additional tips
For more accurate readings, it is recommended to calibrate the sensor. You can perform comparative tests with a known thermometer to fine-tune the temperature coefficient in your code.
Additionally, if you want to measure temperature over a wider range or with greater precision, considering using a specific NTC library can make project development much easier.
Finally, keep in mind that the NTC B3950, like all sensors, has limitations in temperature range and accuracy. If you're working in an extreme environment, be sure to check the sensor's specifications to see if it's suitable for your application.