nz_sensDhtBlock.h File Reference

Functions for DHT11 and DHT22 Temperature and Humidity Sensors. More...

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Detailed Description

Functions for DHT11 and DHT22 Temperature and Humidity Sensors.

Author

Modtronix Engineering

Compiler:

MPLAB XC16

Description

Functions for reading the DHT11 and DHT22 temperature and humidity values. This is a blocking version of the DHT library, meaning code is blocked for about 5ms while a read takes place. The "nz_sensDht.h" and "nz_sensDht.c" is the non blocking version.

Configuration

The following defines are used to configure this module, and should be placed in projdefs.h. Note that all items marked [-DEFAULT-] are defaults, and do not have to be placed in projdefs.h if they contain desired configuration! For details, see Project Configuration.

// *********************************************************************
// --------- DHT Sensor Configuration (from nz_sensDhtBlock.h) -----------
// *********************************************************************
#define SENS_DHT_BLOCK_ENABLE                               // Enable

// Initial read delay 2 seconds (2000ms)
#define SENS_DHT_STARTUP_READ_DELAY           ( 5000 )      //[-DEFAULT-]

// Power down reset time in mS
#define SENS_DHT_POWER_RST_TIME               ( 2000 )      //[-DEFAULT-]

// Delay after reset till read allowed
#define SENS_DHT_RESET_READ_DELAY             ( 2000 )      //[-DEFAULT-]

Usage

To use this module, the following must be done:

• Include nz_sensDhtBlock.h in the c file it is used in.
• Add nz_sensDhtBlock.c to the MPLAB project, this is the main DHT22 driver file.
• The following additional files are required by nz_sensDhtBlock.c, and must be added to the project: nz_helpers.c, nz_ioPorts.c, nz_netcruzer.c
• Add sensDht_task() to main loop. For example: sensDht_init(36); //Initialize using port 36 (old port name Y6) for DHT Sensor while(1) { nzSysTaskDefault(); //Main netcruzer task, call in main loop. sensDht_task(); //DHT22 Task }
• In projdefs.h, do any DHT22 or other configuration required. This is done by copying the configuration section from the *.h files to projdefs.h. Nothing required, defaults will work!
• All done! Can now use DHT22.h driver functions!

For details, see DHT22 and DHT11 demos in "../src/demos/sensors/" folder of Netcruzer Download.

Software License Agreement

The software supplied herewith is owned by Modtronix Engineering, and is protected under applicable copyright laws. The software supplied herewith is intended and supplied to you, the Company customer, for use solely and exclusively on products manufactured by Modtronix Engineering. The code may be modified and can be used free of charge for commercial and non commercial applications. All rights are reserved. Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil liability for the breach of the terms and conditions of this license.

THIS SOFTWARE IS PROVIDED IN AN 'AS IS' CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

File History

2014-01-02, David H. (DH):

• Initial version