B4R Question DHT 11 Example for ESP32

[viriato]

Hi,
I just got my ESP32 NodeMCU and tried the basic examples and all work , including DS1820
But I have issues with DHT11 example , I started with working ESP8266 example it works correctly but not with ESP32 , always get temperature 0 , Humidity 0...

Any help with example or Lib will be welcome
Thanks a lot

Viriato

 

[Erel]

Which library are you using?

The best thing to do to solve this issue is to find an Arduino project that works on ESP32 and then we can compare it to the library that you are using.

 

[viriato]

Hi Erel,
I am using the same program and library (rDht (Version 2.00) for the 3 kits Arduino Uno , ESP8266 , ESP32
Only ESP32 is not working ..

I am probably missing something .... but what
Thanks

 

[rbghongade]

Dear friend,
Try this code:

Sub Process_Globals
    Public Serial1 As Serial
        Public Timer1 As Timer
          Public Interval As Int
    Dim HUMIDITY,TEMPERATURE As Double
   
End Sub

Private Sub AppStart
   
    Serial1.Initialize(115200)
    Log("AppStart")
    Interval=2
        Timer1.Initialize("Timer1_Tick",Interval*1000)
    RunNative("setup",Null)
    Timer1.Enabled = True
End Sub

Sub Timer1_Tick
    TEMPERATURE=0
    RunNative("read",Null)
    Log("  Temperature =",NumberFormat(TEMPERATURE,2,1), " ºC")
    Log("  Humidity =",NumberFormat(HUMIDITY,2,1), " %RH")

End Sub

#if C
#include "DHT.h"

#define DHTPIN 22     // what digital pin we're connected to

#define DHTTYPE DHT22   // DHT 22 

DHT dht(DHTPIN, DHTTYPE);
void setup(B4R::Object* o){
dht.begin();
}
   
void read (B4R::Object* o) {
   b4r_main::_humidity  = dht.readHumidity();
   b4r_main::_temperature = dht.readTemperature();
}

#End if

Note:
1)Make sure you have Arduino library for DHT11/22 installed
2)Replace references to DHT22 by DHT11

 

[viriato]

Hi,
Thank you for the information
I tried your example , but now i have different issue during compile process (see below)
The libraries work since they are the same for Arduino and ESP8266 , correct ?
Any other suggestion ?
Thank very much

Viriato

Preparing boards...
Verifying...
b4r_main.cpp:18: error: 'DHT' does not name a type
DHT dht(DHTPIN, DHTTYPE);
^
C:\Users\fvict\DOCUME~1\B4R\NOUVEA~1\Objects\bin\sketch\b4r_main.cpp: In function 'void setup(B4R::Object*)':
b4r_main.cpp:20: error: expected unqualified-id before '.' token
dht.begin();
^
C:\Users\fvict\DOCUME~1\B4R\NOUVEA~1\Objects\bin\sketch\b4r_main.cpp: In function 'void read(B4R::Object*)':
b4r_main.cpp:24: error: expected primary-expression before '.' token
b4r_main::_humidity = dht.readHumidity();
^
b4r_main.cpp:25: error: expected primary-expression before '.' token
b4r_main::_temperature = dht.readTemperature();
^
exit status 1

 

[rbghongade]

Dear friend,
You should install Arduino library and NOT B4R library for this example.

 

[viriato]

Hi,
The Arduino library is installed ,
Oups, i just forgot to unchecked rDHT .
but not sure I am using the right library ...
now I have different error ..

Preparing boards...
Verifying...
In file included from C:\Program Files (x86)\Arduino\libraries\DHT\DHT_U.cpp:22:0:
C:\Program Files (x86)\Arduino\libraries\DHT\DHT_U.h:25:29: fatal error: Adafruit_Sensor.h: No such file or directory
compilation terminated.
exit status 1

 

[viriato]

Found the right library
It works ..
Thank you for your help