B4R Question Inline C for DHT11

[pokhraj_d]

Hello All,
I am facing error while trying to compile DHT11 sensor for humidity.
I have copied DHT11 sensor library to "C:\Program Files (x86)\Arduino\libraries\DHT-sensor-library-master"

Then I try to compile to compile the below code. But I am facing error :

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 300
#End Region

Sub Process_Globals
    Public Serial1 As Serial
    Public Humid,temperature As Float
    Private pin10 As Pin
    Private timer1 As Timer
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    pin10.Initialize(10,pin10.MODE_OUTPUT)
    timer1.Initialize("timer1_Tick",1000)
    timer1.Enabled=True
    RunNative("setup",Null)
End Sub

Private Sub timer1_tick()
    RunNative("read", Null)
    Log("Humidity :",Humid)
    
End Sub


#if C
#include "dht.h"
DHT dht
void setup(B4R::Object* o){
dht.begin();
}
void read (B4R::Object* o) {
   b4r_main::_humid = dht.readHumidity();
   b4r_main::_temperature =dht.readTemperature();
}
#End if

 

[pokhraj_d]

I have changed some codes and now the different error is coming up.
Please find below my new sketch....

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 300
#End Region

Sub Process_Globals
    Public Serial1 As Serial
    Public Humid,temperature As Float
    Private pin10 As Pin
    Private timer1 As Timer
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    pin10.Initialize(10,pin10.MODE_OUTPUT)
    timer1.Initialize("timer1_Tick",1000)
    timer1.Enabled=True
    RunNative("setup",Null)
End Sub

Private Sub timer1_tick()
    RunNative("read", Null)
    Log("Humidity :",Humid)
    
End Sub


#if C
#include "DHT.h"
#define DHTTYPE DHT11
DHT dht;
void setup(B4R::Object* o){
dht.begin();
}
void read (B4R::Object* o) {
   b4r_main::_humid = dht.readHumidity();
   b4r_main::_temperature =dht.readTemperature();
}
#End if

Please advice on this...

Thanks-
Pokhraj Das

 

[pokhraj_d]

Hello,
Please find the Library file from Arduino libraries...


Thanks-
Pokhraj Das

 

[rbghongade]

DHT pin connection is not passed to inline code.

 

[pokhraj_d]

Hello All,
The issue has been fixed and Sketch is running fine. But the confusion is whether the Temperature is at F or C that I am not sure.
As per the manual the default is at F. Now how can I change it to C [Celcius].

Please advice.

Thanks-
Pokhraj Das

 

[pokhraj_d]

Yes... @rbghongade .. This is absolutely correct. I have fixed the issue. Now How can I change the temperature value from F to C [Celcius].

Please advice.

Thanks,
Pokhraj Das

 

[pokhraj_d]

My Modified code that is running...

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 300
#End Region

Sub Process_Globals
    Public Serial1 As Serial
    Public Humid,temperature As Float
    Private pin10 As Pin
    Private timer1 As Timer
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    pin10.Initialize(10,pin10.MODE_OUTPUT)
    timer1.Initialize("timer1_Tick",1000)
    timer1.Enabled=True
    RunNative("setup",Null)
End Sub

Private Sub timer1_tick()
    RunNative("read", Null)
    Log("Humidity :",Humid)
    If Humid > 70 Then
        Log("Maximum Humidity")
    End If
    Log("Temperature :", temperature)
    
End Sub


#if C
#include "DHT.h"
#define DHTPIN 10
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
void setup(B4R::Object* o){
dht.begin();
}
void read (B4R::Object* o) {
   b4r_main::_humid = dht.readHumidity();
   b4r_main::_temperature =dht.readTemperature();
}
#End if

Thanks-
Pokhraj Das

 

[Mark Read]

Do you have the DHT library? See Here.

 

[pokhraj_d]

@mark35at .... NO... Iam not using the DHT lib you mentioned.... I m using adafruit DHT11 liab.... I already attached the lib at my previous post... just wanted to convert the temp from F to C (celcius). How to convert that...
Please advice

Thanks
Pokhraj Das

 

[Mark Read]

Looking at the code in DHTtester.ino, as in your post:

Line 41 temperature =dht.readTemperature()

gives Celcius

Line 43 temperature =dht.readTemperature(TRUE)

returns Fahrenheit.