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    BT and WiFi Dual Core simultaneous operation using ESP32?

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    • kowshik1729
      kowshik1729 last edited by salmanfaris

      Hey guys,

      I recently learned that ESP32 has Tensilica dual-core processor. So I'm just wondering whether I can run Bluetooth on one core and WiFi on other core. Is this possible?

      1 Reply Last reply Reply Quote 1
      • salmanfaris
        salmanfaris last edited by salmanfaris

        Hi @kowshik1729, That was an interesting question. it can be done, but since the wifi and Bluetooth shares one radio and only one antenna, switching back and forth between wifi and Bluetooth same time while receiving packets will be difficult and cause some packet loss, but it can be done.

        But instead of doing that, you can schedule two task's and switch between the task will only occupy wifi or Bluetooth. (Just a suggestion)

        There is a special option called “Software controls WiFi/ Bluetooth coexistence” it can control the ESP32's Bluetooth and Wi-Fi coexistence using software, more details: https://www.espressif.com/sites/default/files/documentation/ESP32_FAQs__EN.pdf

        d6523210-a40e-44e0-a2f7-48fcbcdfed1f-image.png

        Source: https://www.espressif.com/sites/default/files/documentation/ESP32_FAQs__EN.pdf

        1 Reply Last reply Reply Quote 1
        • kowshik1729
          kowshik1729 last edited by

          @salmanfaris Thanks for the detailed explanation. I would like to add that, while the ESP32 switches from BLE to Wi-Fi so fast, the power consumed will also be very high, and also there is a high risk of having losing data. Hence one has to use an RF High-speed switch like this https://www.digikey.in/short/zf3dzc and have two antennas to switch between the Bluetooth and Wi-Fi. This is the best solution I've got, let me know if you find any.

          salmanfaris 1 Reply Last reply Reply Quote 1
          • salmanfaris
            salmanfaris @kowshik1729 last edited by

            @kowshik1729 If you are using an external high-speed switch, there is only one one clock generator for both wifi and BLE and the high-speed switch you mentioned is Ultra-Wideband (UWB) 3–8 GHz from its datasheet

            b2da6871-9110-40f1-8ff0-d8313547a17a-image.png

            you also check this solution that I shared in the previous post.

            @salmanfaris said in BT and WiFi Dual Core simultaneous operation using ESP32?:

            There is a special option called “Software controls WiFi/ Bluetooth coexistence” it can control the ESP32's Bluetooth and Wi-Fi coexistence using software, more details: https://www.espressif.com/sites/default/files/documentation/ESP32_FAQs__EN.pdf

            1 Reply Last reply Reply Quote 0
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            • @mahesh02 From the current Arduino ESP32 board files, we don't need to install the ESP-NN separately.

              But try to choose the esp32 board version 3.1.3 and check, as I also faced issues with the latest esp32 board file.

              • read more
            • M

              Im having the same error as below, it will be really awesome if you can help me.

              In file included from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_classifier_types.h:40,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_model_types.h:40,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:38,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/mahesh02-project-1_inferencing.h:49,
              from C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:27:
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/model-parameters/model_metadata.h:108:2: warning: #warning 'EI_CLASSFIER_OBJECT_DETECTION_COUNT' is used for the guaranteed minimum number of objects detected. To get all objects during inference use 'bounding_boxes_count' from the 'ei_impulse_result_t' struct instead. [-Wcpp]
              #warning 'EI_CLASSFIER_OBJECT_DETECTION_COUNT' is used for the guaranteed minimum number of objects detected. To get all objects during inference use 'bounding_boxes_count' from the 'ei_impulse_result_t' struct instead.
              ^~~~~~~
              In file included from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/memory.hpp:38,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/ei_alloc.h:34,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/ei_vector.h:34,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/numpy_types.h:40,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/ei_dsp_handle.h:35,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_model_types.h:41,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:38,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/mahesh02-project-1_inferencing.h:49,
              from C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:27:
              c:\users\mahesh\onedrive\documents\arduino\libraries\mahesh02-project-1_inferencing\src\edge-impulse-sdk\porting\ei_classifier_porting.h:310: warning: "EI_PORTING_ARDUINO" redefined
              #define EI_PORTING_ARDUINO 0

              c:\users\mahesh\onedrive\documents\arduino\libraries\mahesh02-project-1_inferencing\src\edge-impulse-sdk\porting\ei_classifier_porting.h:279: note: this is the location of the previous definition
              #define EI_PORTING_ARDUINO 1

              In file included from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/speechpy.hpp:35,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_dsp.h:40,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:41,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/mahesh02-project-1_inferencing.h:49,
              from C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:27:
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp: In static member function 'static int ei::speechpy::feature::mfe(ei::matrix_t*, ei::matrix_t*, ei::signal_t*, uint32_t, float, float, uint16_t, uint16_t, uint32_t, uint32_t, uint16_t)':
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp:236:52: warning: missing initializer for member 'ei::speechpy::ei_stack_frames_info::frame_ixs' [-Wmissing-field-initializers]
              stack_frames_info_t stack_frame_info = { 0 };
              ^
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp:236:52: warning: missing initializer for member 'ei::speechpy::ei_stack_frames_info::frame_length' [-Wmissing-field-initializers]
              In file included from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/speechpy.hpp:35,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_dsp.h:40,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:41,
              from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/mahesh02-project-1_inferencing.h:49,
              from C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:27:
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp: In static member function 'static int ei::speechpy::feature::mfe_v3(ei::matrix_t*, ei::matrix_t*, ei::signal_t*, uint32_t, float, float, uint16_t, uint16_t, uint32_t, uint32_t, uint16_t)':
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp:436:52: warning: missing initializer for member 'ei::speechpy::ei_stack_frames_info::frame_ixs' [-Wmissing-field-initializers]
              stack_frames_info_t stack_frame_info = { 0 };
              ^
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp:436:52: warning: missing initializer for member 'ei::speechpy::ei_stack_frames_info::frame_length' [-Wmissing-field-initializers]
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp: In static member function 'static int ei::speechpy::feature::spectrogram(ei::matrix_t*, ei::signal_t*, float, float, float, uint16_t, uint16_t)':
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp:576:52: warning: missing initializer for member 'ei::speechpy::ei_stack_frames_info::frame_ixs' [-Wmissing-field-initializers]
              stack_frames_info_t stack_frame_info = { 0 };
              ^
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/dsp/speechpy/feature.hpp:576:52: warning: missing initializer for member 'ei::speechpy::ei_stack_frames_info::frame_length' [-Wmissing-field-initializers]
              In file included from C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/mahesh02-project-1_inferencing.h:49,
              from C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:27:
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h: In function 'EI_IMPULSE_ERROR {anonymous}::process_impulse(ei_impulse_handle_t*, ei::signal_t*, ei_impulse_result_t*, bool)':
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:307:23: error: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
              ei_printf("ERR: Out of memory, can't allocate matrix_ptrs[%lu]\n", ix);
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:312:23: error: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
              ei_printf("ERR: Out of memory, can't allocate matrix_ptrs[%lu]\n", ix);
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h: In function 'EI_IMPULSE_ERROR {anonymous}::process_impulse_continuous(ei_impulse_handle_t*, ei::signal_t*, ei_impulse_result_t*, bool)':
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:558:27: error: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
              ei_printf("ERR: Out of memory, can't allocate matrix_ptrs[%lu]\n", ix);
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~
              C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing\src/edge-impulse-sdk/classifier/ei_run_classifier.h:563:27: error: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
              ei_printf("ERR: Out of memory, can't allocate matrix_ptrs[%lu]\n", ix);
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino: In function 'void loop()':
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:181:38: warning: missing initializer for member 'ei_impulse_result_t::bounding_boxes_count' [-Wmissing-field-initializers]
              ei_impulse_result_t result = { 0 };
              ^
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:181:38: warning: missing initializer for member 'ei_impulse_result_t::classification' [-Wmissing-field-initializers]
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:181:38: warning: missing initializer for member 'ei_impulse_result_t::anomaly' [-Wmissing-field-initializers]
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:181:38: warning: missing initializer for member 'ei_impulse_result_t::timing' [-Wmissing-field-initializers]
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:181:38: warning: missing initializer for member 'ei_impulse_result_t::copy_output' [-Wmissing-field-initializers]
              C:\Users\Mahesh\AppData\Local\Temp\arduino_modified_sketch_680639\esp32_camera.ino:181:38: warning: missing initializer for member 'ei_impulse_result_t::postprocessed_output' [-Wmissing-field-initializers]
              cc1plus.exe: some warnings being treated as errors
              Using library mahesh02-project-1_inferencing at version 1.0.1 in folder: C:\Users\Mahesh\OneDrive\Documents\Arduino\libraries\mahesh02-project-1_inferencing
              exit status 1
              Error compiling for board AI Thinker ESP32-CAM.

              • read more

            • This also happened to me when I was given a task from my company, So what I can recommend is:
              Ensure that the correct board, "AI Thinker ESP32-CAM," is selected in the Tools menu of your Arduino IDE.
              If the board is not listed, you may need to install it through the Board Manager. Search for "ESP32" and install the latest version.
              Ensure that necessary libraries like ESP32-CAM, WiFi, and HTTPClient are installed. You can install them through the Library Manager.

              Carefully check your code for typos, missing semicolons, or incorrect syntax.
              Verify that you're using the correct function names and parameters.

              • read more

            • Hi @PumpedMedusa, The rage is depends on the Antenna and how much TX power you have.

              To choose antenna, first you need figure out - where your nodes will be, take a look at the below image. The antenna act like a "torch" if you have more dbi that mean it's focus will be increase and it can reach more distance but the angle it have it less, like a laser.

              458a3da2-175a-4968-917c-56c5a1b763f8-image.png

              also, obstacle such as buildings, tress and mountains will affect the signal and deplete it.

              afe5eba4-b192-4263-8596-80c912fc1f23-image.png

              So, answer for you question - What is the best LoRa module to use for long distance network? - It's really depends on where you planning to put the nodes and how high you putting the gateway. Let me know know your thoughts.

              • read more

            • @Parves-DOMINO Did you able to solve the issue?

              • read more
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