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Component: Temp / Humidity (DHT11) (Environmental): Difference between revisions

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==Component Source Code==
==Component Source Code==


Please click here to download the component source project: [https://www.flowcode.co.uk/wikicopy/componentsource/FC_Comp_Source_DHT11.fcfx FC_Comp_Source_DHT11.fcfx]
Please click here to download the component source project: [https://www.flowcode.co.uk/wiki/componentsource/FC_Comp_Source_DHT11.fcfx FC_Comp_Source_DHT11.fcfx]


Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_DHT11.fcfx FC_Comp_Source_DHT11.fcfx]
Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_DHT11.fcfx FC_Comp_Source_DHT11.fcfx]
Line 38: Line 38:




''No detailed description exists yet for this component''
==Examples==




Line 51: Line 45:




''No detailed description exists yet for this component''


==Examples==




Line 64: Line 60:




Example Program showing how to sample the DHT11 sensor and show the temperature and humidity on an LCD.
{{Fcfile|DHT11_Example.fcfx|DHT11 Example}}


==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;" | '''GetTempWhole'''
|-
| colspan="2" | Gets the whole number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 15. 
|-
|-
| 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;" | '''GetHumidityFloat'''
|-
| colspan="2" | Gets the humidity returned by calling SampleSensor as a floating point number.  
|-
|-
| 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;" | '''GetTempString'''
|-
| colspan="2" | Gets the temperature returned by calling SampleSensor as a string.  
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-string-icon.png]] - STRING
| 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;" | '''GetHumidityString'''
|-
| colspan="2" | Gets the humidity returned by calling SampleSensor as a string.  
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-string-icon.png]] - STRING
| 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;" | '''GetHumidityWhole'''
|-
| colspan="2" | Gets the whole number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 15. 
|-
|-
| 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;"
Example Program showing how to sample the DHT11 sensor and show the temperature and humidity on an LCD.
|-
{{Fcfile|DHT11_Example.fcfx|DHT11 Example}}
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempReal'''
|-
| colspan="2" | Gets the real number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 8. 
|-
|-
| 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" | Gets the real number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 8. 
|-
|-
| 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;" | '''SampleSensor'''
|-
| colspan="2" | Communicates with the DHT11 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u8-icon.png]] - BYTE
| 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;" | '''GetTempFloat'''
|-
| colspan="2" | Gets the temperature returned by calling SampleSensor as a floating point number.  
|-
|-
| 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''
|}








==Property reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
| 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-5-icon.png]]
| width="90%" | Data Pin
|-
| colspan="2" | Microcontroller I/O Pin connected to the DHT11 sensor data pin. 
|-
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
| width="90%" | Use Checksum
|-
| colspan="2" | The checksum value is used to ensure the data being received is correct. Yes = Only receive data if checksum is correct No = Ignore checksum 
|-
| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Advanced Settings
|-
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | Clock Adjustment
|-
| colspan="2" | On 8-bit PIC devices the timings can be a little tight as slower clock speeds and so we implement an adjustment factor to allow the sensor to function. Auto mode will attempt to automatically calculate a correct adjustment factor. Manual mode will allow you to set your own adjustment factor. 
|}==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;" | '''GetTempWhole'''
|-
| colspan="2" | Gets the whole number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 15. 
|-
|-
| 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''
|}


==Macro reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetHumidityFloat===
{| 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;" | '''GetHumidityFloat'''
| width="90%" class="mtx-class-macrohead" | '''GetHumidityFloat'''
|-
|-
| colspan="2" | Gets the humidity returned by calling SampleSensor as a floating point number.  
| colspan="2" | Gets the humidity returned by calling SampleSensor as a floating point number.  
Line 242: Line 101:




{| 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;" | '''GetTempString'''
| width="90%" class="mtx-class-macrohead" | '''GetHumidityReal'''
|-
|-
| colspan="2" | Gets the temperature returned by calling SampleSensor as a string.  
| colspan="2" | Gets the real number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 8. 
|-
|-
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-string-icon.png]] - STRING
| 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;"
===GetHumidityString===
{| 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;" | '''GetHumidityString'''
| width="90%" class="mtx-class-macrohead" | '''GetHumidityString'''
|-
|-
| colspan="2" | Gets the humidity returned by calling SampleSensor as a string.  
| colspan="2" | Gets the humidity returned by calling SampleSensor as a string.  
Line 268: Line 129:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetHumidityWhole===
{| 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;" | '''GetHumidityWhole'''
| width="90%" class="mtx-class-macrohead" | '''GetHumidityWhole'''
|-
|-
| colspan="2" | Gets the whole number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 15. 
| colspan="2" | Gets the whole number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 15. 
Line 281: Line 143:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetTempFloat===
|-
{| 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;" | '''GetTempReal'''
|-
| colspan="2" | Gets the real number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 8. 
|-
|-
| 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" | Gets the real number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 8. 
|-
|-
| 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;" | '''SampleSensor'''
|-
| colspan="2" | Communicates with the DHT11 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u8-icon.png]] - BYTE
| 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;" | '''GetTempFloat'''
| width="90%" class="mtx-class-macrohead" | '''GetTempFloat'''
|-
|-
| colspan="2" | Gets the temperature returned by calling SampleSensor as a floating point number.  
| colspan="2" | Gets the temperature returned by calling SampleSensor as a floating point number.  
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===GetTempReal===
 
{| class="mtx-class-macrotable wikitable"
==Property reference==
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''  
| width="90%" class="mtx-class-macrohead" | '''GetTempReal'''
|-
|-
|-
| colspan="2" | Gets the real number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 8. 
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
| width="90%" | Data Pin
|-
| colspan="2" | Microcontroller I/O Pin connected to the DHT11 sensor data pin. 
|-
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
| width="90%" | Use Checksum
|-
| colspan="2" | The checksum value is used to ensure the data being received is correct. Yes = Only receive data if checksum is correct No = Ignore checksum 
|-
| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Advanced Settings
|-
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | Clock Adjustment
|-
| colspan="2" | On 8-bit PIC devices the timings can be a little tight as slower clock speeds and so we implement an adjustment factor to allow the sensor to function. Auto mode will attempt to automatically calculate a correct adjustment factor. Manual mode will allow you to set your own adjustment factor. 
|}==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;" | '''GetTempWhole'''
|-
| colspan="2" | Gets the whole number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 15. 
|-
|-
|-
|-
Line 376: Line 171:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetTempString===
|-
{| 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;" | '''GetHumidityFloat'''
|-
| colspan="2" | Gets the humidity returned by calling SampleSensor as a floating point number.  
|-
|-
| 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="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempString'''
| width="90%" class="mtx-class-macrohead" | '''GetTempString'''
|-
|-
| colspan="2" | Gets the temperature returned by calling SampleSensor as a string.  
| colspan="2" | Gets the temperature returned by calling SampleSensor as a string.  
Line 402: Line 185:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===GetTempWhole===
{| 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;" | '''GetHumidityString'''
| width="90%" class="mtx-class-macrohead" | '''GetTempWhole'''
|-
|-
| colspan="2" | Gets the humidity returned by calling SampleSensor as a string.  
| colspan="2" | Gets the whole number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 15. 
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-string-icon.png]] - STRING
| 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;" | '''GetHumidityWhole'''
|-
| colspan="2" | Gets the whole number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 15. 
|-
|-
| 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;" | '''GetTempReal'''
|-
| colspan="2" | Gets the real number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 8. 
|-
|-
| 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" | Gets the real number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 8. 
|-
|-
|-
|-
Line 454: Line 199:




{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===SampleSensor===
{| 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;" | '''SampleSensor'''
| width="90%" class="mtx-class-macrohead" | '''SampleSensor'''
|-
|-
| colspan="2" | Communicates with the DHT11 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
| colspan="2" | Communicates with the DHT11 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
Line 465: Line 211:
| 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;"
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempFloat'''
|-
| colspan="2" | Gets the temperature returned by calling SampleSensor as a floating point number.  
|-
|-
| 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''
|}




==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 500: Line 231:
| colspan="2" | The checksum value is used to ensure the data being received is correct. Yes = Only receive data if checksum is correct No = Ignore checksum 
| colspan="2" | The checksum value is used to ensure the data being received is correct. Yes = Only receive data if checksum is correct No = Ignore checksum 
|-
|-
| 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;" | Advanced Settings
| width="90%" class="mtx-class-propfolder" | Advanced Settings
|-
|-
|-
|-

Latest revision as of 14:37, 13 July 2026

Author Matrix TSL
Version 1.1
Category Environmental


Temp / Humidity (DHT11) component

The DHT11 temperature and humidity sensor is a popular sensor allowing the ambient temperature and relative humidity to be monitored digitally. Humidity Range = 20% - 90% +/- 5% Temperature Range = 0 - 50 Degrees C +/- 2 Degrees C

Component Source Code

Please click here to download the component source project: FC_Comp_Source_DHT11.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_DHT11.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Example Program showing how to sample the DHT11 sensor and show the temperature and humidity on an LCD. DHT11 Example






Macro reference

GetHumidityFloat

GetHumidityFloat
Gets the humidity returned by calling SampleSensor as a floating point number.  
- FLOAT Return


GetHumidityReal

GetHumidityReal
Gets the real number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 8. 
- INT Return


GetHumidityString

GetHumidityString
Gets the humidity returned by calling SampleSensor as a string.  
- STRING Return


GetHumidityWhole

GetHumidityWhole
Gets the whole number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 15. 
- INT Return


GetTempFloat

GetTempFloat
Gets the temperature returned by calling SampleSensor as a floating point number.  
- FLOAT Return


GetTempReal

GetTempReal
Gets the real number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 8. 
- INT Return


GetTempString

GetTempString
Gets the temperature returned by calling SampleSensor as a string.  
- STRING Return


GetTempWhole

GetTempWhole
Gets the whole number portion of the temperature returned by calling SampleSensor. If temperature is 15.8 degrees C then this function would return 15. 
- INT Return


SampleSensor

SampleSensor
Communicates with the DHT11 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
- BYTE Return


Property reference

Properties
Data Pin
Microcontroller I/O Pin connected to the DHT11 sensor data pin. 
Use Checksum
The checksum value is used to ensure the data being received is correct. Yes = Only receive data if checksum is correct No = Ignore checksum 
Advanced Settings
Clock Adjustment
On 8-bit PIC devices the timings can be a little tight as slower clock speeds and so we implement an adjustment factor to allow the sensor to function. Auto mode will attempt to automatically calculate a correct adjustment factor. Manual mode will allow you to set your own adjustment factor. 
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