Difference between revisions of "Component: Temp / Humidity (DHT22) (Environmental)"
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Revision as of 13:30, 17 November 2021
| Author | Matrix TSL |
| Version | 1.2 |
| Category | Environmental |
Contents
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
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.
DHT22 Example
Downloadable macro reference
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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
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Return |
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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. | |
 - FLOAT
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Return |
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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". | |
 - STRING
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Return |
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GetHumidityString |
| Gets the humidity returned by calling SampleSensor as a string. If humidity is 15.8 % then this function would return "15.8". | |
| - STRING
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Return |
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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
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Return |
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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
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Return |
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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
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Return |
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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. | |
 - BYTE
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Return |
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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. | |
| - FLOAT
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Return |
Property reference
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Properties |
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SIG Pin |
| Microcontroller I/O Pin connected to the DHT11 sensor data pin. | |
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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 | |
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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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Connections |
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Simulations |
