I am facing problem with DHT11 Sensor. Can you please help on this?

### Generating code into build folder: C:\Users\ACER\Desktop\DHT11\DHT11_ert_rtw

The file containing block diagram 'DHT11' is shadowed by a file of the same name higher on the MATLAB path. This can cause unexpected behavior. For more information see "Avoiding Problems with Shadowed Files" in the Simulink documentation.

The file containing the block diagram is: C:\Users\ACER\Desktop\DHT11\DHT11.slx.

The file higher on the MATLAB path is: C:\Users\ACER\Desktop\DHT11\DHT11.mexw64 [2 similar]

Component:Simulink | Category:Block diagram warning

### Invoking Target Language Compiler on DHT11.rtw

### Using System Target File: C:\Program Files\MATLAB\R2017a\rtw\c\ert\ert.tlc

### Loading TLC function libraries

......

### Initial pass through model to cache user defined code

.

### Caching model source code

........................

### Writing header file DHT11.h

.

### Writing header file DHT11_types.h

### Writing header file rtwtypes.h

### Writing header file multiword_types.h

### Writing source file DHT11.c

### Writing header file DHT11_private.h

### Writing header file rtmodel.h

.

### Writing source file ert_main.c

### TLC code generation complete.

### Generating TLC interface API.

..

### Creating data type transition file DHT11_dt.h

### Evaluating PostCodeGenCommand specified in the model

### Using toolchain: Arduino AVR v1.6.13 | gmake (64-bit Windows)

### Creating 'C:\Users\ACER\Desktop\DHT11\DHT11_ert_rtw\DHT11.mk' ...

### Building 'DHT11': "C:\PROGRA~1\MATLAB\R2017a\bin\win64\gmake" -f DHT11.mk all

C:\Users\ACER\Desktop\DHT11\DHT11_ert_rtw>cd .

C:\Users\ACER\Desktop\DHT11\DHT11_ert_rtw>if "" == "" ("C:\PROGRA~1\MATLAB\R2017a\bin\win64\gmake" -f DHT11.mk all ) else ("C:\PROGRA~1\MATLAB\R2017a\bin\win64\gmake" -f DHT11.mk )

C:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/bin/avr-gcc -std=gnu11 -c -g -w -ffunction-sections -fdata-sections -MMD -DARDUINO=10613 -MMD -MP -MF"DHT11.dep" -MT"DHT11.o" -Os -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -D_RUNONTARGETHARDWARE_BUILD_ -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DON_TARGET_WAIT_FOR_START=1 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DRT -DMW_TIMERID=1 -DMW_PRESCALAR=256 -DMW_TIMERCOUNT=59286 -DMW_SCHEDULERCOUNTER=1 -D_RTT_BAUDRATE_SERIAL0_=9600 -D_RTT_ANALOG_REF_=0 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DON_TARGET_WAIT_FOR_START=1 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -DRT -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -IC:/Users/ACER/Desktop/DHT11 -IC:/PROGRA~1/MATLAB/R2017a/simulink/include/sf_runtime -IC:/Users/ACER/Desktop/DHT11/DHT11_ert_rtw -IC:/PROGRA~1/MATLAB/R2017a/extern/include -IC:/PROGRA~1/MATLAB/R2017a/simulink/include -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src/ext_mode/common -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/ert -IC:/PROGRA~1/MATLAB/R2017a/toolbox/coder/rtiostream/src/utils -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/cores/arduino -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/variants/standard -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/libraries/Servo/src -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/scheduler/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinobase/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/avr/include/avr -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/shared/externalmode_daemon/include -o DHT11.o DHT11.c

C:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/bin/avr-gcc -std=gnu11 -c -g -w -ffunction-sections -fdata-sections -MMD -DARDUINO=10613 -MMD -MP -MF"ext_work.dep" -MT"ext_work.o" -Os -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -D_RUNONTARGETHARDWARE_BUILD_ -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DON_TARGET_WAIT_FOR_START=1 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DRT -DMW_TIMERID=1 -DMW_PRESCALAR=256 -DMW_TIMERCOUNT=59286 -DMW_SCHEDULERCOUNTER=1 -D_RTT_BAUDRATE_SERIAL0_=9600 -D_RTT_ANALOG_REF_=0 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DON_TARGET_WAIT_FOR_START=1 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -DRT -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -IC:/Users/ACER/Desktop/DHT11 -IC:/PROGRA~1/MATLAB/R2017a/simulink/include/sf_runtime -IC:/Users/ACER/Desktop/DHT11/DHT11_ert_rtw -IC:/PROGRA~1/MATLAB/R2017a/extern/include -IC:/PROGRA~1/MATLAB/R2017a/simulink/include -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src/ext_mode/common -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/ert -IC:/PROGRA~1/MATLAB/R2017a/toolbox/coder/rtiostream/src/utils -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/cores/arduino -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/variants/standard -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/libraries/Servo/src -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/scheduler/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinobase/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/avr/include/avr -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/shared/externalmode_daemon/include -o ext_work.o C:/PROGRA~1/MATLAB/R2017a/rtw/c/src/ext_mode/common/ext_work.c

C:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/bin/avr-gcc -std=gnu11 -c -g -w -ffunction-sections -fdata-sections -MMD -DARDUINO=10613 -MMD -MP -MF"rtiostream_utils.dep" -MT"rtiostream_utils.o" -Os -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -D_RUNONTARGETHARDWARE_BUILD_ -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DON_TARGET_WAIT_FOR_START=1 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DRT -DMW_TIMERID=1 -DMW_PRESCALAR=256 -DMW_TIMERCOUNT=59286 -DMW_SCHEDULERCOUNTER=1 -D_RTT_BAUDRATE_SERIAL0_=9600 -D_RTT_ANALOG_REF_=0 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DON_TARGET_WAIT_FOR_START=1 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -DRT -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -IC:/Users/ACER/Desktop/DHT11 -IC:/PROGRA~1/MATLAB/R2017a/simulink/include/sf_runtime -IC:/Users/ACER/Desktop/DHT11/DHT11_ert_rtw -IC:/PROGRA~1/MATLAB/R2017a/extern/include -IC:/PROGRA~1/MATLAB/R2017a/simulink/include -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src/ext_mode/common -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/ert -IC:/PROGRA~1/MATLAB/R2017a/toolbox/coder/rtiostream/src/utils -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/cores/arduino -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/variants/standard -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/libraries/Servo/src -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/scheduler/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinobase/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/avr/include/avr -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/shared/externalmode_daemon/include -o rtiostream_utils.o C:/PROGRA~1/MATLAB/R2017a/toolbox/coder/rtiostream/src/utils/rtiostream_utils.c

C:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/bin/avr-gcc -std=gnu11 -c -g -w -ffunction-sections -fdata-sections -MMD -DARDUINO=10613 -MMD -MP -MF"DHT_11_wrapper.dep" -MT"DHT_11_wrapper.o" -Os -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -D_RUNONTARGETHARDWARE_BUILD_ -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DON_TARGET_WAIT_FOR_START=1 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DRT -DMW_TIMERID=1 -DMW_PRESCALAR=256 -DMW_TIMERCOUNT=59286 -DMW_SCHEDULERCOUNTER=1 -D_RTT_BAUDRATE_SERIAL0_=9600 -D_RTT_ANALOG_REF_=0 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DEXT_MODE=1 -DINTEGER_CODE=0 -DMT=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DON_TARGET_WAIT_FOR_START=1 -DEXIT_FAILURE=1 -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -DSTACK_SIZE=64 -DRT -DMODEL=DHT11 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -IC:/Users/ACER/Desktop/DHT11 -IC:/PROGRA~1/MATLAB/R2017a/simulink/include/sf_runtime -IC:/Users/ACER/Desktop/DHT11/DHT11_ert_rtw -IC:/PROGRA~1/MATLAB/R2017a/extern/include -IC:/PROGRA~1/MATLAB/R2017a/simulink/include -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/src/ext_mode/common -IC:/PROGRA~1/MATLAB/R2017a/rtw/c/ert -IC:/PROGRA~1/MATLAB/R2017a/toolbox/coder/rtiostream/src/utils -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/cores/arduino -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/arduino/avr/variants/standard -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/libraries/Servo/src -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinotarget/scheduler/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/supportpackages/arduinobase/include -IC:/ProgramData/MATLAB/SupportPackages/R2017a/3P.instrset/arduinoide.instrset/arduino-1.6.13/hardware/tools/avr/avr/include/avr -IC:/ProgramData/MATLAB/SupportPackages/R2017a/toolbox/target/shared/externalmode_daemon/include -o DHT_11_wrapper.o ../DHT_11_wrapper.c

In file included from ../DHT_11_wrapper.c:19:0:

C:/Users/ACER/Desktop/DHT11/dht.h:23:1: error: unknown type name 'class'

class dht

^

C:/Users/ACER/Desktop/DHT11/dht.h:24:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token

{

^

../DHT_11_wrapper.c:20:23: fatal error: SimpleDHT.h: No such file or directory

#include <SimpleDHT.h>

^

compilation terminated.

gmake: *** [DHT_11_wrapper.o] Error 1

C:\Users\ACER\Desktop\DHT11\DHT11_ert_rtw>echo The make command returned an error of 2

The make command returned an error of 2

C:\Users\ACER\Desktop\DHT11\DHT11_ert_rtw>An_error_occurred_during_the_call_to_make

'An_error_occurred_during_the_call_to_make' is not recognized as an internal or external command,

operable program or batch file.

### Creating HTML report file DHT11_codegen_rpt.html

### Build procedure for model: 'DHT11' aborted due to an error.

Error(s) encountered while building "DHT11":

### Failed to generate all binary outputs

[Walter Roberson]

dht.h appears to be for C++ but is being used in C code.

Somehow you have DHT11.mexw64 in a directory that contains DHT11.slx . You should try to figure out where the mex came from. The warning is right that it does conflict with the Simulink model.

Answer 1

[BhaTTa]

Hey @MUHAMMAD HANIF ISMAIL, I understand the issue you're facing. as an alternative I recommend using the IO Device Builder, you should be able to create a more robust integration for your DHT11 sensor.

Refer to the given example below:

https://www.mathworks.com/help/simulink/supportpkg/arduino_ref/dht11-relative-humidity-temperature-io-device-builder.html