Design with Analog Temperature Sensor (NTC) (Wokwi Compatible) in Cirkit DesignerThe Analog Temperature Sensor (NTC) is a crucial component in electronics for measuring temperature. NTC stands for Negative Temperature Coefficient, which means the resistance of the sensor decreases as the temperature increases. This sensor provides a variable voltage output that is inversely proportional to the temperature. Common applications include environmental temperature monitoring, system thermal protection, and temperature regulation in consumer electronics.
This circuit is a multi-sensor data acquisition system that uses a Nucleo WB55RG microcontroller to interface with a digital temperature sensor (TMP102), a pulse oximeter and heart-rate sensor (MAX30102), and a 0.96" OLED display via I2C. Additionally, it includes a Sim800l module for GSM communication, powered by a 3.7V LiPo battery.
Open Project in Cirkit Designer
This circuit appears to be a temperature sensing system using an NTC thermistor connected to an Arduino Nano. The NTC thermistor forms part of a voltage divider with a 100k Ohm resistor, and the resulting voltage is read by the Arduino's analog input A0. The purpose of the circuit is likely to measure temperature changes, which can be inferred from the varying resistance of the NTC with temperature.
Open Project in Cirkit Designer
This circuit is a temperature monitoring and control system using an Arduino UNO. It includes an NTC thermistor for temperature sensing, pushbuttons for user input, an I2C module for communication, and a fan controlled by a MOSFET. The system also features a buzzer for alerts and an LCD for displaying information.
Open Project in Cirkit Designer
This circuit is a temperature monitoring system that uses an Arduino UNO to read temperature data from an LM35 sensor, display the data on an LED dot display, and transmit the data via an HC-05 Bluetooth module. Additionally, it includes a DS1307 RTC module for timekeeping.
Open Project in Cirkit Designer| Pin Number | Description |
|---|---|
| 1 | VCC (Power Supply) |
| 2 | Signal Output (Analog) |
| 3 | GND (Ground) |
// Include the necessary libraries
#include <math.h>
// Define the analog pin connected to the sensor
const int analogPin = A0;
// Define the value of the pull-up resistor
const float seriesResistor = 10000.0;
// Define the B-constant of the NTC
const float bConstant = 3950.0;
// Define the nominal resistance at 25 degrees Celsius
const float nominalResistance = 10000.0;
// Define the nominal temperature in Kelvin
const float nominalTemperature = 298.15;
void setup() {
Serial.begin(9600);
}
void loop() {
int analogValue = analogRead(analogPin);
float resistance = (1023.0 / analogValue) - 1;
resistance = seriesResistor / resistance;
// Calculate the temperature in Kelvin
float temperatureK = bConstant / log(resistance / nominalResistance * exp(-bConstant / nominalTemperature));
// Convert Kelvin to Celsius
float temperatureC = temperatureK - 273.15;
// Print the temperature to the Serial Monitor
Serial.print("Temperature: ");
Serial.print(temperatureC);
Serial.println(" C");
// Wait for a second before taking the next reading
delay(1000);
}
Q: Can I use this sensor with a 3.3V system? A: Yes, the sensor can typically operate at 3.3V, but ensure to adjust the pull-up resistor value accordingly.
Q: How do I calibrate the sensor? A: Compare the sensor output at a known temperature (e.g., ice water at 0°C) and adjust the code or circuit as needed.
Q: What is the purpose of the B-constant? A: The B-constant is used in the Steinhart-Hart equation to calculate the temperature from the resistance of the NTC sensor. It is specific to the material of the thermistor and must be accurate for precise temperature readings.
Q: How often should I take readings from the sensor? A: It depends on your application. For stable environments, a few readings per minute may suffice. For rapidly changing temperatures, you may need readings every few seconds.