Embedded Files
STM32 Internal Temperature Sensor Example
Introduction
The STM32 has a built-in temperature sensor used to measure the chip's internal temperature. To read the internal temperature sensor value, you'll need to use the STM32 core libraries. The STM32's internal temperature sensor is a useful feature for monitoring the microcontroller’s temperature, but accessing it requires a bit of setup.
The STM32 microcontrollers have an internal temperature sensor whose output can be read via the ADC (Analog-to-Digital Converter). The temperature sensor's output is typically not directly in degrees Celsius but needs to be converted from raw ADC values.
Key Points:
Channel: The temperature sensor is usually mapped to a specific ADC channel. For many STM32 microcontrollers, this is channel 16.
Reference Voltage: The sensor output is scaled relative to the internal reference voltage (often 3.3V or 1.2V).
Step 1: Connect Board to Laptop
Step 2: Internal Temperature Sensor Example Code
Select boar STM32 DEV Module from Tools >> Boards menu, then select appropriate com port. Upload this program to STM32.
#include <STM32FreeRTOS.h>
#include <Wire.h>
#include <STM32LowPower.h>
#define TEMPERATURE_SENSOR_CHANNEL 16 // Channel number for internal temperature sensor
void setup() {
Serial.begin(115200);
while (!Serial);
// Initialize the ADC
analogReadResolution(12); // Set ADC resolution to 12 bits
analogReadTemperature(); // Initialize the temperature sensor
Serial.println("Temperature sensor initialized.");
}
void loop() {
// Read the temperature sensor
int rawTempValue = analogRead(TEMPERATURE_SENSOR_CHANNEL);
// Convert raw value to temperature
float temperature = (rawTempValue * 330.0 / 4095.0) - 40.0; // Adjust this value based on STM32 datasheet
Serial.print("Temperature: ");
Serial.print(temperature);
Serial.println(" C");
delay(1000); // Delay for 1 second before the next reading
}
The Serial Monitor should display the temperature readings from the internal sensor.
Notes -
The exact channel number and conversion formula might vary depending on the specific STM32 variant you’re using. Check the STM32 reference manual for details.
Ensure that you have installed all the necessary drivers and libraries for STM32 in the Arduino IDE.
If you encounter issues with the analogRead function or temperature calculations, consult the STM32 documentation for your specific model, as the ADC configuration and sensor calibration may differ.
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