Component: Temp / Humidity (DHT11) (Environmental)
| 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
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
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. | |
| [[File:]] - | Return |
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GetHumidityFloat |
| Gets the humidity returned by calling SampleSensor as a floating point number. | |
| [[File:]] - | Return |
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GetTempString |
| Gets the temperature returned by calling SampleSensor as a string. | |
 - STRING
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Return |
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GetHumidityString |
| Gets the humidity returned by calling SampleSensor as a string. | |
| - 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. | |
| [[File:]] - | 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. | |
| [[File:]] - | 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. | |
| [[File:]] - | Return |
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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
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Return |
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GetTempFloat |
| Gets the temperature returned by calling SampleSensor as a floating point number. | |
| [[File:]] - | Return |
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Initialise |
| Initialise the sensor configuration as set by the component properties | |
 - VOID
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Return |
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Initialise |
| Stes up the I2C bus and initialises the termperature sensor ready for use. | |
| - VOID
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Return |
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SimSetGyro |
| Allows the XYZ slider values to be set via the simulation | |
| [[File:]] - | X |
| [[File:]] - | Y |
| [[File:]] - | Z |
| - VOID
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Return |
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UpdateAccelerometerData |
| Reads from the accelerometer and updates the local XYZ variables. Returns 1 for new data and 0 for no new data | |
| - BYTE
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Return |
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SimSetCompass |
| Allows the XYZ slider values to be set via the simulation | |
| [[File:]] - | X |
| [[File:]] - | Y |
| [[File:]] - | Z |
| - VOID
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Return |
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Read_Bearing |
| Reads the current sensor compass bearing based on degrees CW from magnetic north. Returns 0-359 where 0 = North, 90 = East, 180 = South, 270 = West Requires the ArcTan floating point function to be available to work correctly. Supported on AVR, 16-bit | |
| - BYTE
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NumSamples |
| The number of readings to base the bearing on | |
 - UINT
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Return |
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Initialise |
| Sets up up the communication bus and initialises the accelerometer module. Returns 0 for success and > 0 for fail. | |
| - BYTE
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Return |
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IOSetOutputPin |
| Sets the selected digital pin to an output and assigns the output state. | |
| - BYTE
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Pin |
| Range: 0-29 | |
| [[File:]] - | State |
| Range: 0-1 | |
| - VOID
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Return |
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UARTReceive |
| Receives a data byte from the UART. Recommend calling the UARTCheckRx function first to ensure data is available. | |
| - BYTE
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Channel |
| Channel Index: Range 0 - UART Bus Count - 1 | |
| - BYTE
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Return |
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ADCSampleAverage10 |
| Reads the voltage present on an Analog pin as an 10-bit value range 0-1023. Performs the selected number of samples with the selected time in microseconds in between samples | |
| - BYTE
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ADCChannel |
| Range: 0, 3-7 | |
| - BYTE
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SampleCount |
| Range: 1- 100 | |
| - BYTE
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SampleDelay |
| Delay in us between each sample | |
| - UINT
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Return |
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OneWireScanBus |
| Scans the one wire bus to detect all connected devices. Returns the number of one wire devices found. | |
| - BYTE
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Channel |
| Channel Index: Range 0 - I2C Bus Count - 1 | |
| - BYTE
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Return |
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SPIInitialise |
| Initialsie the SPI module ready for communications | |
| - BYTE
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Channel |
| Channel Index: Range 0 - SPI Bus Count - 1 | |
| - VOID
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Return |
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OneWireReceiveByte |
| Receives a byte from the one wire bus a bit at a time | |
| - BYTE
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Channel |
| Channel Index: Range 0 - I2C Bus Count - 1 | |
| - BYTE
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Return |
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I2CSend |
| Transmit a byte using the I2C bus | |
| - BYTE
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Channel |
| Channel Index: Range 0 - I2C Bus Count - 1 | |
| - BYTE
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DataOut |
| [[File:]] - | Return |
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UARTSend |
| Send a byte via the UART module | |
| - BYTE
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Channel |
| Channel Index: Range 0 - UART Bus Count - 1 | |
| - BYTE
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Data |
| Data Byte to send. Range: 0-255 | |
| - VOID
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Return |
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OneWireGetDeviceCount |
| Returns the number of devices found by the last ScanBus operation. | |
| - BYTE
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Channel |
| Channel Index: Range 0 - I2C Bus Count - 1 | |
| - BYTE
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Return |
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PWMSetPrescaler |
| Sets the prescaler for the PWM output | |
| - BYTE
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Channel |
| Range: 0 - 11 | |
| - BYTE
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Prescaler |
| - BYTE
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Period |
| - VOID
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Return |
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PWMEnable |
| Enable a PWM output | |
| - BYTE
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Channel |
| Range: 0-11 | |
| - VOID
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Return |
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ADCSampleArray10 |
| Reads the voltage present on an Analog pin as an 10-bit value range 0-1023 Performs the selected number of samples with the selected time in microseconds in between samples and returns each sample in a single packet | |
| - BYTE
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ADCChannel |
| Range: 0, 3-7 | |
| - BYTE
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SampleCount |
| Range: 1- 32 | |
| - UINT
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SampleDelay |
| Delay in us between each sample | |
| - UINT
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Samples |
| 10-bit samples returned from the function | |
| - VOID
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Return |
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ADCSampleAverage8 |
| Reads the voltage present on an Analog pin as an 8-bit value range 0-255 Performs the selected number of samples with the selected time in microseconds in between samples | |
| - BYTE
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ADCChannel |
| Range: 0, 3-7 | |
| - BYTE
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SampleCount |
| Range: 1- 100 | |
| - BYTE
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SampleDelay |
| Delay in us between each sample | |
| - BYTE
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Return |
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Initialise |
| Initialise the comms to the Arduino board ready for commands to be sent. | |
| - VOID
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Return |
Property reference
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Properties |
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Data 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 |