SensorKTY81_1xx Class Reference

KTY81-1xx type silicon temperature sensor readout and conversion functions using the ESP32 ADC in its high-linearity region. More...

#include <sensor_kty81_1xx.hpp>

Inheritance diagram for SensorKTY81_1xx:

Collaboration diagram for SensorKTY81_1xx:

Public Member Functions
	SensorKTY81_1xx (adc1_channel_t channel, EquidistantPWLUInt16< _common_conf.lut_size > *interpolator)
	Initialize the analog ADC channel for use with the sensor. More...
void	update_filter ()
	Updates the moving average with a new sampled value from ADC. More...
float	get_temp_pwl ()
	Excellent precision temperature sensing using piecewise linear interpolation of Look-Up-Table values for a KTY81-121 type sensor. Use this if temperatures above 100°C ore below 0°C are to be measured. More...
float	get_temp_lin ()
	Fairly precise temperature conversion if the temperature sensor voltage has good linearisation. Worst results at temperature extremes. More...

Public Attributes
ESP32ADCChannelFiltered< _common_conf.moving_average_filter_len >	adc_ch

Static Public Attributes
static constexpr auto	_common_conf = KTY81_1xxCommonConfig{}

Protected Attributes
EquidistantPWLUInt16< _common_conf.lut_size > *	_interpolator

Detailed Description

KTY81-1xx type silicon temperature sensor readout and conversion functions using the ESP32 ADC in its high-linearity region.

Sensor connected between GND and ADC input and biased using a 2.2 kOhms series-resistor connected to 3.3V supply.

  +-----------------------+
  |                       |
 +++                      |VREF
 | |r_pullup              |(3V3)
 | |(2k2)             +----------+
 +++                  |          |
  |                   |          |
  +-------------+-----+ AIN      |
  |             |     |          |
 +++            |     +---+------+
 | |KTY81-    +---+       | AGND
 | | 1xx      +---+       |
 +++            |100nF    |
  |             |         |
  +-------------+---------+

Currently not implemented but useful addition would be ratiometric measurement by additionally sampling the 3.3V reference/supply.

Sensor readout with piecewise linear interpolation of LUT calibration values or linear calculation as an option for lower precision applications

Constructor & Destructor Documentation

SensorKTY81_1xx()

SensorKTY81_1xx::SensorKTY81_1xx	(	adc1_channel_t	channel,
		EquidistantPWLUInt16< _common_conf.lut_size > *	interpolator
	)

Initialize the analog ADC channel for use with the sensor.

Parameters

channel	ADC 1 channel number
interpolator	Ptr. to interpolator, see class EquidistantPWLUInt16.

Note

See derived classes SensorKTY81_121 and SensorKTY81_110_120.

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Member Function Documentation

get_temp_lin()

float SensorKTY81_1xx::get_temp_lin

(

)

Fairly precise temperature conversion if the temperature sensor voltage has good linearisation. Worst results at temperature extremes.

Returns

Temperature in °C

Note

This only reports the current state of the internal filter. You must call update_filter() periodicly to read new physical data!

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get_temp_pwl()

float SensorKTY81_1xx::get_temp_pwl

(

)

Excellent precision temperature sensing using piecewise linear interpolation of Look-Up-Table values for a KTY81-121 type sensor. Use this if temperatures above 100°C ore below 0°C are to be measured.

Returns

Temperature in °C

Note

This only reports the current state of the internal filter. You must call update_filter() periodicly to read new physical data!

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update_filter()

void SensorKTY81_1xx::update_filter

(

)

Updates the moving average with a new sampled value from ADC.

This must be called periodically.

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

• main/include/sensor_kty81_1xx.hpp
• main/sensor_kty81_1xx.cpp