upm  1.7.1
Sensor/Actuator repository for libmraa (v2.0.0)
Public Member Functions

API for NTC Temperature Sensors. More...

Detailed Description

Basic UPM module for analog temperature sensors. These sensors use a NTC thermistor to measure ambient temperature. This driver was developed using the Grove Temperature Sensor. The conversion formula has been updated to work with versions 1.1 and 1.2 of the sensor. For the older v1.0 sensor you will have to specify R0 and B values when initializing the device. The range of this sensor is -40 to 125 C and accuracy is +/- 1.5 C.

// Create the temperature sensor object using AIO pin 0
std::cout << temp.name() << std::endl;
// Read the temperature ten times, printing both the Celsius and
// equivalent Fahrenheit temperature, waiting one second between readings
for (int i = 0; i < 10; i++) {
int celsius = temp.value();
int fahrenheit = (int) (celsius * 9.0 / 5.0 + 32.0);
printf("%d degrees Celsius, or %d degrees Fahrenheit\n", celsius, fahrenheit);
// Delete the temperature sensor object

Public Member Functions

 Temperature (unsigned int pin, float scale=1.0, int r0=100000, int b=4275)
 ~Temperature ()
float raw_value ()
std::string name ()
int value ()

Constructor & Destructor Documentation

Temperature ( unsigned int  pin,
float  scale = 1.0,
int  r0 = 100000,
int  b = 4275 

Analog temperature sensor constructor

pinAnalog pin to use
scaleScaling factor for raw analog value from the ADC, useful for mixed 3.3V/5V boards, default 1.0
r0zero power resistance, this is 100K (default) for v1.1-v1.2 and 10K for v1.0 of the sensor
bthermistor nominal B constant, this is 4275 (default) for v1.1-v1.2 and 3975 for v1.0 of the sensor

Analog temperature sensor destructor

Member Function Documentation

float raw_value ( )

Gets the raw value from the AIO pin

Raw value from the ADC
std::string name ( )

Provided for compatibility with old grove base class

Sensor name

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int value ( )

Gets the temperature in Celsius from the sensor

Normalized temperature in Celsius

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The documentation for this class was generated from the following files: