Difference between revisions of "Component: Temp / Humidity (DHT22) (Environmental)"

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==Temp / Humidity (DHT22) component==
 
==Temp / Humidity (DHT22) component==
 
The DHT22 temperature and humidity sensor is a popular sensor allowing the ambient  temperature and relative humidity to be monitored digitally. Humidity Range = 0% - 100% +/- 2% Temperature Range = -40 - 80 Degrees C +/- 0.5 Degrees C
 
The DHT22 temperature and humidity sensor is a popular sensor allowing the ambient  temperature and relative humidity to be monitored digitally. Humidity Range = 0% - 100% +/- 2% Temperature Range = -40 - 80 Degrees C +/- 0.5 Degrees C
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==Component Source Code==
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Please click here to download the component source project: [https://www.flowcode.co.uk/wiki/componentsource/FC_Comp_Source_DHT22.fcfx FC_Comp_Source_DHT22.fcfx]
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Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_DHT22.fcfx FC_Comp_Source_DHT22.fcfx]
  
 
==Detailed description==
 
==Detailed description==
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==Examples==
 
==Examples==
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{{Fcfile|DHT22_Example.fcfx|DHT22 Example}}
 
{{Fcfile|DHT22_Example.fcfx|DHT22 Example}}
  
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==Downloadable macro reference==
 
  
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==Macro reference==
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===GetHumidityFloat===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
−
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempWhole'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityFloat'''
 
|-
 
|-
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| 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. 
+
| colspan="2" | Gets the humidity returned by calling SampleSensor as a floating point number. If humidity is 15.8 % then this function would return 15.8. 
 
|-
 
|-
 
|-
 
|-
−
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:]] -  
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| 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''
 
|}
 
|}
  
  
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===GetHumidityReal===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
−
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityFloat'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityReal'''
 
|-
 
|-
−
| colspan="2" | Gets the humidity returned by calling SampleSensor as a floating point number. If humidity is 15.8 % then this function would return 15.8. 
+
| 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:]] -  
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| 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''
 
|}
 
|}
  
  
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===GetHumidityString===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempString'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityString'''
 
|-
 
|-
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| colspan="2" | Gets the temperature returned by calling SampleSensor as a string. If temperature is 15.8 degrees C then this function would return "15.8". 
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| colspan="2" | Gets the humidity returned by calling SampleSensor as a string. If humidity is 15.8 % then this function would return "15.8". 
 
|-
 
|-
 
|-
 
|-
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===GetHumidityWhole===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
−
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityString'''
+
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityWhole'''
 
|-
 
|-
−
| colspan="2" | Gets the humidity returned by calling SampleSensor as a string. If humidity is 15.8 % then this function would return "15.8". 
+
| 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-string-icon.png]] - STRING
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| 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''
 
|}
 
|}
  
  
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===GetTempFloat===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
−
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityWhole'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempFloat'''
 
|-
 
|-
−
| 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 temperature returned by calling SampleSensor as a floating point number. If temperature is 15.8 degrees C then this function would return 15.8. 
 
|-
 
|-
 
|-
 
|-
−
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:]] -  
+
| 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''
 
|}
 
|}
  
  
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===GetTempReal===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
|-
 
|-
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|-
 
|-
 
|-
 
|-
−
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:]] -  
+
| 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''
 
|}
 
|}
  
  
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===GetTempString===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetHumidityReal'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempString'''
 
|-
 
|-
−
| 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. 
+
| colspan="2" | Gets the temperature returned by calling SampleSensor as a string. If temperature is 15.8 degrees C then this function would return "15.8". 
 
|-
 
|-
 
|-
 
|-
−
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:]] -  
+
| 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''
 
| width="90%" style="border-top: 2px solid #000;" | ''Return''
 
|}
 
|}
  
  
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===GetTempWhole===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SampleSensor'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempWhole'''
 
|-
 
|-
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| colspan="2" | Communicates with the DHT22 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
+
| 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-u8-icon.png]] - BYTE
+
| 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''
 
|}
 
|}
  
  
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===SampleSensor===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| 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" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''GetTempFloat'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SampleSensor'''
 
|-
 
|-
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| colspan="2" | Gets the temperature returned by calling SampleSensor as a floating point number. If temperature is 15.8 degrees C then this function would return 15.8. 
+
| colspan="2" | Communicates with the DHT22 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:]] -  
+
| 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''
 
| width="90%" style="border-top: 2px solid #000;" | ''Return''
 
|}
 
|}
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−
 
  
  
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|-
 
|-
 
| 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 
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|-
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Advanced Settings
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|-
 
|-
 
|-
 
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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|-
 
|-
 
| 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. 
 
| 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. 
−
|-
 
−
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-conn-icon.png]]
 
−
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Connections'''
 
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|-
 
−
|-
 
−
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-conn-icon.png]]
 
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Simulations'''
 
−
|-
 
 
|}
 
|}

Latest revision as of 10:25, 20 October 2023

Author Matrix TSL
Version 1.2
Category Environmental


Temp / Humidity (DHT22) component

The DHT22 temperature and humidity sensor is a popular sensor allowing the ambient temperature and relative humidity to be monitored digitally. Humidity Range = 0% - 100% +/- 2% Temperature Range = -40 - 80 Degrees C +/- 0.5 Degrees C

Component Source Code

Please click here to download the component source project: FC_Comp_Source_DHT22.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_DHT22.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Example Program showing how to sample the DHT22 sensor and show the temperature and humidity on an LCD. FC6 Icon.png DHT22 Example







Macro reference

GetHumidityFloat

Fc9-comp-macro.png GetHumidityFloat
Gets the humidity returned by calling SampleSensor as a floating point number. If humidity is 15.8 % then this function would return 15.8. 
Fc9-f32-icon.png - FLOAT Return


GetHumidityReal

Fc9-comp-macro.png GetHumidityReal
Gets the real number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 8. 
Fc9-s16-icon.png - INT Return


GetHumidityString

Fc9-comp-macro.png GetHumidityString
Gets the humidity returned by calling SampleSensor as a string. If humidity is 15.8 % then this function would return "15.8". 
Fc9-string-icon.png - STRING Return


GetHumidityWhole

Fc9-comp-macro.png GetHumidityWhole
Gets the whole number portion of the humidity returned by calling SampleSensor. If humidity is 15.8 % then this function would return 15. 
Fc9-s16-icon.png - INT Return


GetTempFloat

Fc9-comp-macro.png GetTempFloat
Gets the temperature returned by calling SampleSensor as a floating point number. If temperature is 15.8 degrees C then this function would return 15.8. 
Fc9-f32-icon.png - FLOAT Return


GetTempReal

Fc9-comp-macro.png 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. 
Fc9-s16-icon.png - INT Return


GetTempString

Fc9-comp-macro.png GetTempString
Gets the temperature returned by calling SampleSensor as a string. If temperature is 15.8 degrees C then this function would return "15.8". 
Fc9-string-icon.png - STRING Return


GetTempWhole

Fc9-comp-macro.png 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. 
Fc9-s16-icon.png - INT Return


SampleSensor

Fc9-comp-macro.png SampleSensor
Communicates with the DHT22 sensor and receives the temperature and humidity readings. Returns 0 for success, 1 for no communication detected and 2 for checksum error. 
Fc9-u8-icon.png - BYTE Return


Property reference

Fc9-prop-icon.png Properties
Fc9-type-5-icon.png SIG Pin
Microcontroller I/O Pin connected to the DHT11 sensor data pin. 
Fc9-type-7-icon.png 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 
Fc9-conn-icon.png Advanced Settings
Fc9-type-16-icon.png 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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