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Humidity and temperature sensor using an SHT21 IC connected via I2C. On screen GUI allows temperature and humidity values to be simulated, and will show all I2C communication in a console window.
Humidity and temperature sensor using an SHT21 IC connected via I2C. On screen GUI allows temperature and humidity values to be simulated, and will show all I2C communication in a console window.


==Component Source Code==
==Detailed description==
 
 
 
 


Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_Humidity_SHT21.fcfx FC_Comp_Source_Humidity_SHT21.fcfx]


==Detailed description==




Line 58: Line 60:




''<span style="color:red;">No additional examples</span>''




==Macro reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTemperatureReal'''
|-
| colspan="2" | Return temperature reading as a float value in degrees C&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-f32-icon.png]] - FLOAT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTemperatureData'''
|-
| colspan="2" | Returns the raw register pair value&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u16-icon.png]] - UINT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}


''<span style="color:red;">No additional examples</span>''


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTemperatureInt'''
|-
| colspan="2" | Return temperature reading as an integer value in degrees C&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-s16-icon.png]] - INT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityInt'''
|-
| colspan="2" | returns the relative Humidity reading as an integer value&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-s16-icon.png]] - INT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityReal'''
|-
| colspan="2" | returns the Humidity reading as a float value&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-f32-icon.png]] - FLOAT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityData'''
|-
| colspan="2" | Returns the raw register pair value&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u16-icon.png]] - UINT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Initialise'''
|-
| colspan="2" | Initialises the component ready for I2C communications&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}








==Property reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
==Macro reference==
|-
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''
|-
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | Channel
|-
| colspan="2" | Channel selection&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
| width="90%" | SDA
|-
| colspan="2" | Pin used for SDA (data signal)&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
| width="90%" | SCL
|-
| colspan="2" | Pin used for SCL (clock signal)&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | Baud Select
|-
| colspan="2" | Baud rate option selector&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-14-icon.png]]
| width="90%" | Baud Rate
|-
| colspan="2" | Baud rate to be used&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
| width="90%" | Stop Delay
|-
| colspan="2" | On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not  a 10ms delay between an I2C stop event and the next I2C start event.  Most modern microcontrollers will not have a problem so this property can be disabled to speed up the  I2C communications. &nbsp;
|-
| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Simulation
|-
|-
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
| width="90%" | Simulation Comms
|-
| colspan="2" | &nbsp;
|}==Macro reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetHumidityInt===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTemperatureReal'''
| width="90%" class="mtx-class-macrohead" | '''GetHumidityInt'''
|-
|-
| colspan="2" | Return temperature reading as a float value in degrees C&nbsp;
| colspan="2" | returns the relative Humidity reading as an integer value&nbsp;
|-
|-
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-f32-icon.png]] - FLOAT
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-s16-icon.png]] - INT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetHumidityReal===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTemperatureData'''
| width="90%" class="mtx-class-macrohead" | '''GetHumidityReal'''
|-
|-
| colspan="2" | Returns the raw register pair value&nbsp;
| colspan="2" | returns the Humidity reading as a float value&nbsp;
|-
|-
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u16-icon.png]] - UINT
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-f32-icon.png]] - FLOAT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}
|}




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetTemperatureInt===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTemperatureInt'''
| width="90%" class="mtx-class-macrohead" | '''GetTemperatureInt'''
|-
|-
| colspan="2" | Return temperature reading as an integer value in degrees C&nbsp;
| colspan="2" | Return temperature reading as an integer value in degrees C&nbsp;
Line 243: Line 125:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetTemperatureReal===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityInt'''
| width="90%" class="mtx-class-macrohead" | '''GetTemperatureReal'''
|-
|-
| colspan="2" | returns the relative Humidity reading as an integer value&nbsp;
| colspan="2" | Return temperature reading as a float value in degrees C&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-s16-icon.png]] - INT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}
 
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityReal'''
|-
| colspan="2" | returns the Humidity reading as a float value&nbsp;
|-
|-
|-
|-
Line 269: Line 139:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===Initialise===
|-
{| class="mtx-class-macrotable wikitable"
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityData'''
|-
| colspan="2" | Returns the raw register pair value&nbsp;
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u16-icon.png]] - UINT
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}
 
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Initialise'''
| width="90%" class="mtx-class-macrohead" | '''Initialise'''
|-
|-
| colspan="2" | Initialises the component ready for I2C communications&nbsp;
| colspan="2" | Initialises the component ready for I2C communications&nbsp;
Line 293: Line 151:
| width="90%" style="border-top: 2px solid #000;" | ''Return''
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}
|}




==Property reference==
==Property reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-prop-icon.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''  
| width="90%" class="mtx-class-macrohead" | '''Properties'''  
|-
|-
|-
|-
Line 314: Line 170:
|-
|-
| colspan="2" | Pin used for SDA (data signal)&nbsp;
| colspan="2" | Pin used for SDA (data signal)&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | SDA Remap Pin
|-
| colspan="2" | &nbsp;
|-
|-
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
Line 319: Line 180:
|-
|-
| colspan="2" | Pin used for SCL (clock signal)&nbsp;
| colspan="2" | Pin used for SCL (clock signal)&nbsp;
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | SCL Remap Pin
|-
| colspan="2" | &nbsp;
|-
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
Line 335: Line 201:
| colspan="2" | On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not  a 10ms delay between an I2C stop event and the next I2C start event.  Most modern microcontrollers will not have a problem so this property can be disabled to speed up the  I2C communications. &nbsp;
| colspan="2" | On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not  a 10ms delay between an I2C stop event and the next I2C start event.  Most modern microcontrollers will not have a problem so this property can be disabled to speed up the  I2C communications. &nbsp;
|-
|-
| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Simulation
| width="90%" class="mtx-class-propfolder" | Simulation
|-
|-
|-
|-
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| colspan="2" | &nbsp;
| colspan="2" | &nbsp;
|}
|}
==Component Source Code==
Please click here to download the component source project: [https://www.flowcode.co.uk/wiki/componentsource/FC_Comp_Source_Humidity_SHT21.fcfx FC_Comp_Source_Humidity_SHT21.fcfx]
Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_Humidity_SHT21.fcfx FC_Comp_Source_Humidity_SHT21.fcfx]

Latest revision as of 14:37, 13 July 2026

Author Matrix TSL
Version 2.0
Category Environmental


Temp / Humidity (SHT21) component

Humidity and temperature sensor using an SHT21 IC connected via I2C. On screen GUI allows temperature and humidity values to be simulated, and will show all I2C communication in a console window.

Detailed description

No detailed description exists yet for this component

Examples

No additional examples








Macro reference

GetHumidityInt

GetHumidityInt
returns the relative Humidity reading as an integer value 
- INT Return


GetHumidityReal

GetHumidityReal
returns the Humidity reading as a float value 
- FLOAT Return


GetTemperatureInt

GetTemperatureInt
Return temperature reading as an integer value in degrees C 
- INT Return


GetTemperatureReal

GetTemperatureReal
Return temperature reading as a float value in degrees C 
- FLOAT Return


Initialise

Initialise
Initialises the component ready for I2C communications 
- VOID Return


Property reference

Properties
Channel
Channel selection 
SDA
Pin used for SDA (data signal) 
SDA Remap Pin
 
SCL
Pin used for SCL (clock signal) 
SCL Remap Pin
 
Baud Select
Baud rate option selector 
Baud Rate
Baud rate to be used 
Stop Delay
On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not a 10ms delay between an I2C stop event and the next I2C start event. Most modern microcontrollers will not have a problem so this property can be disabled to speed up the I2C communications.  
Simulation
Simulation Comms
 

Component Source Code

Please click here to download the component source project: FC_Comp_Source_Humidity_SHT21.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_Humidity_SHT21.fcfx

Retrieved from "https://www.flowcode.co.uk/wiki/index.php?title=Component:_Temp_/_Humidity_(SHT21)_(Environmental)&oldid=48256"