ustd::TempHumDHT Class Reference

mupplet-sensor temperature and humidity with DHT11/22 More...

#include <mup_temphum_dht.h>

Public Member Functions
	TempHumDHT (String name, uint8_t port, uint8_t interruptIndex, DHTType dhtType=DHTType::DHT22, FilterMode filterMode=FilterMode::MEDIUM)
double	getTemperature ()
double	getHumidity ()

Detailed Description

mupplet-sensor temperature and humidity with DHT11/22

The temphum_dht mupplet measures temperature and humidity using a DHT11 or DHT22 sensor

Messages sent by temphum_dht mupplet:

topic	message body	comment
<mupplet-name>/sensor/temperature	temperature in degree celsius	Float value encoded as string
<mupplet-name>/sensor/humidity	humidity in percent	Float value encoded as string
<mupplet-name>/sensor/mode	FAST, MEDIUM, or LONGTERM	Integration time for sensor values

Messages received by temphum_dht mupplet:

topic	message body	comment
<mupplet-name>/sensor/temperature/get	-	Causes current value to be sent.
<mupplet-name>/sensor/humidity/get	-	Causes current value to be sent.
<mupplet-name>/sensor/mode/get	-	Returns filterMode: FAST, MEDIUM, or LONGTERM
<mupplet-name>/sensor/mode/set	FAST, MEDIUM, or LONGTERM	Set integration time for illuminance values

Sample code

For a complete examples see the muwerk/examples project.

#define __ESP__ 1
#include "scheduler.h"
#include "mup_temphum_dht.h"
 
ustd::Scheduler sched;
ustd::TempHumDHT dht("myDHT",D4);
 
void task0(String topic, String msg, String originator) {
    if (topic == "myDHT/sensor/temperature") {
        Serial.print("Temperature: ");
        Serial.prinln(msg);  // String float
    }
}
 
void setup() {
    dht.begin(&sched);
    String name="myDHT";
    auto fnall = [=](String topic, String msg, String originator) {
        this->subsMsg(topic, msg, originator);
    };
    pSched->subscribe(tID, name + "/sensor/#", fnall);
}

DHT protocol state diagram

..........MCU awakens DHT...............||.........DHT preamble..........|......data bit 1...........|......data bit 2...........| -> 40 data bits.
...........MCU writes...................||..............MCU reads, DHT writes.......................................................
 - - - -+                      +--------||- - -+            +--- 80us ---+         +- 27us or 70 us -+         +- 27us or 70 us -+
        |                      |               |            |            |         |  0bit    1bit   |         |  0bit    1bit   |
        |                      |               |            |            |         |                 |         |                 |
        |                      |               |            |            |         |                 |         |                 |
        |                      |               |            |            |         |                 |         |                 |
        +--------// 22ms // ---+               +--- 80us ---+            +--50 us -+                 +--50 us -+                 + . . . 38 more bits
                 (1)              (2)    |          (3.1)        (3.2)       (4)           (5)        

Constructor & Destructor Documentation

TempHumDHT()

ustd::TempHumDHT::TempHumDHT ( String  name, uint8_t  port, uint8_t  interruptIndex, DHTType  dhtType = DHTType::DHT22, FilterMode  filterMode = FilterMode::MEDIUM  )

inline

Instantiate an DHT sensor mupplet

Parameters

name	Name used for pub/sub messages
port	GPIO port with A/D converter capabilities.
interruptIndex	A unique index [0..9] for the interrupt used. If multiple mupplets use interrupts, this index must be unique for each mupplet.
dhtType	DHT11, DHT22
filterMode	FAST, MEDIUM or LONGTERM filtering of sensor values

Member Function Documentation

getHumidity()

double ustd::TempHumDHT::getHumidity ( )

inline

Get current humidity

Returns

Humidity (in percent)

getTemperature()

double ustd::TempHumDHT::getTemperature ( )

inline

Get current temperature

Returns

Temperature (in degrees celsius)

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The documentation for this class was generated from the following file:

• src/mup_temphum_dht.h