Component: Thermistor (Environmental)

Author	Matrix TSL
Version	1.1
Category	Environmental

Thermistor component

A generic thermistor component that can be used to simulate and create code for any thermistor with a known temperature/resistance curve. Thermistor is connected in a simple potential divider circuit - thermistor between ADC input and 0V, and a fixed resistor between ADC and the positive supply. Default calibration is for the EBM003 module.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_Thermistor.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_Thermistor.fcfx

Detailed description

No detailed description exists yet for this component

Examples

No additional examples

Macro reference

GetIntegerTemperature

	GetIntegerTemperature
Reads the ADC input and returns the calculated Temperature as Integer degrees C
- INT	Return

SetChannel

	SetChannel
Set the ADC Channel
- INT	ChannelID
- VOID	Return

SetMinMax

	SetMinMax
Set the minimum and maximum temperature values that can be shown and set on the thermometer readout.
- FLOAT	Min
Minimum Value
- FLOAT	Max
Maximum Value
- VOID	Return

GetRealTemperature

	GetRealTemperature
Reads the ADC input and Returns the calculated Temperature as Float value in degrees C
- FLOAT	Return

SetTemperature

	SetTemperature
Sends the given temperature to the display, and calculates the internal values used by the simulated read macros.
- FLOAT	Temperature
Zero to one value - representing min-max of the sensor.
- VOID	Return

CalculateTemperature

	CalculateTemperature
Converts the input ADC value and returns the Temperature in tenths of degree C
- UINT	ADCValue
ADC Reading to be converted
- INT	Return

GetADCValue

	GetADCValue
Returns the Raw ADC value from the Analogue Channel
- UINT	Return

Property reference

	Properties
	ADC Properties
	ADC Channel
The ADC channel to which the thermistor circuit is connected. It is assumed that the thermistor is connected between the ADC pin and 0V, with a fixed resistor connected between the ADC pin and +V.
	VRef option
Defines what is used as the ADC maximum reference. ADC Range = GND to VRef Voltage VDD - Defines the microcontrollers power supply pin as the max reference, VREF+ Pin - Dedicated pin on the microcontroller to allow for a variable reference voltage.
	ADC Bit Resolution
	Conversion speed
Clock setting to select how fast the ADC peripheral will perform an ADC conversion. The FRC setting is based on a RC time base and so will vary with temperature and pressure. Other settings are generally based on divisions of the master clock.
	Acquisition cycles
Number of micro seconds to wait for the ADC input to charge before starting the analogue sample.
	Thermistor Properties
	Wiring
Specifies the arrangement of the Thermistor and Fixed Resistor. Pull Down - Thermistor connected between ADC pin and GND, fixed resistor between ADC pin and VCC. Pull Up - Thermistor connected between ADC pin and VCC, fixed resistor between ADC pin and GND.
	Resistor Value
Value in Ohms of the pullup series resistor. i.e. The resistor is connected between the ADC pin and the positive supply rail.
	-25C Thermistor Value
Value in Ohms of the Thermistor at -25 deg C
	0C Thermistor Value
Value in Ohms of the Thermistor at 0 deg C
	25C Thermistor Value
Value in Ohms of the Thermistor at 25 deg C
	50C Thermistor Value
Value in Ohms of the Thermistor at 50 deg C
	75C Thermistor Value
Value in Ohms of the Thermistor at 75 deg C
	100C Thermistor Value
Value in Ohms of the Thermistor at 100 deg C
	125C Thermistor Value
Value in Ohms of the Thermistor at 125 deg C
	Simulation
	Label
A text label to help you identify the component on the panel.
	Min. Temp.
Minimum termperature that can be set or displayed on the thermometer slider.
	Max. Temp.
Maximum termperature that can be set or displayed on the thermometer slider.
	Scale divisions
Number of numbered divisions shown on the thermometer scale.