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Questions on the implementation of Wi-Fi (802.11) hardware. Note shopping questions are off-topic.

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ellasmith
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ellasmith
Asked: August 24, 2023In:
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Hello Can I get access to the low-level RF encoder/ decoder on the ESP32- C3? I would like to transfer and receive my own signals applying the 2.4 GHz antenna, outside of the Bluetooth/ wifi protocols. The reason I need to ...Read more

Hello

Can I get access to the low-level RF encoder/ decoder on the ESP32- C3? I would like to transfer and receive my own signals applying the 2.4 GHz antenna, outside of the Bluetooth/ wifi protocols. The reason I need to do this is for an ultra-low latency application in which I simply want to send extremely simple information (a single yes/ no) and there’s just one transmitter and one receiver in the location where my product will be deployed.

Thank You

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antennabluetoothdecoderencoderesp32rfwifi
  1. vikas Nagpal

    Hello, Yes, the ESP32-C3 microcontroller provides access to the low-level RF encoder/decoder functionality for custom transmission and reception on the 2.4 GHz frequency. The ESP32-C3 is equipped with a Wi-Fi/Bluetooth subsystem, but it also supports other communication modes, such as RF communicatiRead more

    Hello,

    Yes, the ESP32-C3 microcontroller provides access to the low-level RF encoder/decoder functionality for custom transmission and reception on the 2.4 GHz frequency. The ESP32-C3 is equipped with a Wi-Fi/Bluetooth subsystem, but it also supports other communication modes, such as RF communication using the RF module.

    To use the RF module for your application, you would typically need to bypass the higher-level protocols like Wi-Fi and Bluetooth and directly control the RF interface. The ESP32-C3 provides a general-purpose radio (RF) peripheral that can be used for this purpose.

    Thank You

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nidhi singh
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nidhi singh
Asked: July 22, 2023In:
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Hello, I need to make a transparent WiFi to Ethernet (and vice versa) router. The main using script is to connect the laptop via WiFi to the access point of ESP32- S3 and get the full vision of a direct connection ...Read more

Hello,

I need to make a transparent WiFi to Ethernet (and vice versa) router. The main using script is to connect the laptop via WiFi to the access point of ESP32- S3 and get the full vision of a direct connection to Ethernet.

I guess I need to capture IP packets from WiFi and redirect them into an Ethernet adapter, but do not know how to get raw IP packets from the lwIP stack. Another question is how to connect the Ethernet adapter to the embedded lwIP stack simultaneously with WiFi.

Any idea how to do this?

Thank You

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embeddedethernetlwipSTACKwifi
  1. ashishgawade

    Hello, To create a transparent WiFi to Ethernet router, you will need to implement packet forwarding between the WiFi interface and the Ethernet interface. This can be done using the lwIP stack, which is commonly used in embedded systems. To get raw IP packets from the lwIP stack, you can use the lwRead more

    Hello,

    To create a transparent WiFi to Ethernet router, you will need to implement packet forwarding between the WiFi interface and the Ethernet interface. This can be done using the lwIP stack, which is commonly used in embedded systems.

    To get raw IP packets from the lwIP stack, you can use the lwIP raw API. This API allows you to register a callback function that is called whenever a packet is received or sent by the lwIP stack. You can use this callback function to capture the IP packets from the WiFi interface and forward them to the Ethernet interface.

    Thank You

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ashishgawade
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ashishgawade
Asked: June 22, 2023In:
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Hii, I have the raw ESP32 S3 with a self-made Inverted-F antenna. I can scan for different WiFis and can discover quite a some with fine signal strength. I can not, still, connect to any WiFi. It tries to connect ...Read more

Hii, I have the raw ESP32 S3 with a self-made Inverted-F antenna.
I can scan for different WiFis and can discover quite a some with fine signal strength.
I can not, still, connect to any WiFi. It tries to connect forever. Even when I get really very close to the router.
similarly, creating an AP doesn’t give an error, but the AP doesn’t become visible when scanning with other devices.

I assume there’s some error that prevents me from * transferring * anything.
What could be the issue?

Thank you in advance.

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antennaesp32espressifinvertedtransferringwifi
  1. Julian White

    Hello! It sounds like you're having trouble connecting your ESP32 S3 to WiFi and creating an access point. There could be a few different issues causing this, but here are a few things you could check: Make sure you are using the correct WiFi credentials. Double-check the SSID and password you are uRead more

    Hello! It sounds like you’re having trouble connecting your ESP32 S3 to WiFi and creating an access point. There could be a few different issues causing this, but here are a few things you could check:

    1. Make sure you are using the correct WiFi credentials. Double-check the SSID and password you are using to connect to the WiFi network. If you’re not sure, try connecting to a different WiFi network with known credentials to see if that works.
    2. Check that your antenna is properly connected to the ESP32 S3. Make sure the antenna is securely attached and that the connection is not loose. You could also try using a different antenna to see if that solves the problem.
    3. Check your code to ensure that you are properly configuring the ESP32 S3 to connect to the WiFi network or create an access point. Make sure you are using the correct libraries and functions to connect to WiFi and create an access point.
    4. Check the power supply to your ESP32 S3. Make sure it is receiving enough power to operate properly. You could try using a different power source or adding a capacitor to help stabilize the power supply.
    5. Try resetting your ESP32 S3 to its default settings. This can sometimes help clear up any configuration issues that may be causing the problem.

    I hope these suggestions help you get your ESP32 S3 up and running! Let me know if you have any further questions.

    Thank You

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nidhi singh
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nidhi singh
Asked: May 27, 2023In:
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Hello All, I’ve designed a very smooth and low ripple 5V force for my board. This gets coupled through an LDO 3.3 V controller to feed the ESP32 (same as most boards out there). When the ESP32 transmits WiFi, I see ...Read more

Hello All,

I’ve designed a very smooth and low ripple 5V force for my board. This gets coupled through an LDO 3.3 V controller to feed the ESP32 (same as most boards out there). When the ESP32 transmits WiFi, I see a 50- 100mV drop in the 3.3 V rail and it’s being coupled through to the 5V side of the 3.3 V reg.
Large electrolytic caps on the 5V side and the 3.3 V side bettered it greatly (to the 50- 100mV measured result) but I would like to see further improvements.

Most 3.3 V LDO regs all appear to have the same/similar load regulation characteristics so I’m not yet convinced a change in reg will resolve the issue. Having a 16-bit ADC on board means I’m very sensitive to voltage changes on the 5V rail.

Has anyone overcome this issue already?

Thanks

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controlleresp32ldoregulationtransmitsvoltagewifi
  1. Alex thomas

    It will not. Note that the 3.3 V LDO doesn't" regulate" its input voltage. The drop you see on the 5V side is the result of the ESP drawing more current during TX and the 5V supply/ rail failing to a) give that amount of current while maintaining 5V, or b) react to the change in current quickly enouRead more

    It will not. Note that the 3.3 V LDO doesn’t” regulate” its input voltage. The drop you see on the 5V side is the result of the ESP drawing more current during TX and the 5V supply/ rail failing to a) give that amount of current while maintaining 5V, or b) react to the change in current quickly enough. There is nothing the LDO can do to change the current the load draws from the force.

    So some options are
    a) beef up the power supply
    b) (further) reduce the impedance of the power supply (i.e. further caps), and make sure supply and ground/ return lines and connections have low resistance
    c) consider decoupling only the sensitive circuitry (ADC,.) from the 5V supply, which may be easier to achieve (less current) than stabilizing the whole 5V rail.

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Julian White
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Julian White
Asked: April 11, 2023In:
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Hello, When I have an ESP32 – CAM and it takes a picture with a time interval and sends it(FTP?) not via SDcard but directly to a chart in my PC which is connected to the same WIFI network as the ...Read more

Hello,

When I have an ESP32 – CAM and it takes a picture with a time interval and sends it(FTP?) not via SDcard but directly to a chart in my PC which is connected to the same WIFI network as the PC.
Does an Arduino sketch example or such exist to realize it?

Thank You

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arduinoesp32ftpharddiskpicturewifi
  1. Alex thomas

    Hello Julian, The Arduino forum has a post that will do what you want, basically, take a picture and FTP it. Thank You

    Hello Julian,

    The Arduino forum has a post that will do what you want, basically, take a picture and FTP it.
    Thank You
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vikas Nagpal
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vikas Nagpal
Asked: December 28, 2022In:
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Hello, I presently research and suppose about the possibilities to initial flash and later update the firmware on an ESP32 based product from the price point, I would like to use an ESP32-C3 and the built-in USB port to flash & ...Read more

Hello,

I presently research and suppose about the possibilities to initial flash and later update the firmware on an ESP32 based product from the price point, I would like to use an ESP32-C3 and the built-in USB port to flash & update the firmware.
That indeed would save the USB2UART chip.
I can’t go with the S2 as I need WiFi and Bluetooth.

But I didn’t find any tutorial/extended info if/how this is possible. The only things I found

  • DFU — Using the native USB on ESP32-S2 for flashing the firmware
  • Nearly was mentioned that C3 USB can be used in CDC mode
  • CircuitPython on Espressif SoCs

so I currently don’t know if it’s possible. I hope anybody can shine some light on this for me;-)

Thank and Regards

Vikas

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bluetoothesp32espressiffirmwareusbusb2uartwifi
  1. ashishgawade

    Hello, Thanks for reaching out to Volt Engineering Community. The C3 has a USB device that effectively replaces an external USB- serial and USB- JTAG chip; you should be suitable to use that to flash updates. Please let us know if it answers your question. Regards, Ashish

    Hello,

    Thanks for reaching out to Volt Engineering Community.

    The C3 has a USB device that effectively replaces an external USB- serial and USB- JTAG chip; you should be suitable to use that to flash updates.

    Please let us know if it answers your question.

    Regards,

    Ashish

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nidhi singh
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nidhi singh
Asked: October 14, 2022In:
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Hello, I want to use ESP32- S3 for a device that makes no use of WiFi announcement Bluetooth, so I will keep them disabled. My question is what would be the expected current draw with the radio disabled? Trying to figure ...Read more

Hello,

I want to use ESP32- S3 for a device that makes no use of WiFi announcement Bluetooth, so I will keep them disabled. My question is what would be the expected current draw with the radio disabled? Trying to figure out my power supply conditions.

Thanks

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esp32esp32-s3powerradiowifi
  1. Alex thomas

    Hi, You can find this information in the ESP32- S3 datasheet, Table 4- 9" Current Consumption in Modem- sleep Mode".( Modem- sleep mode is the mode where the radios( modems) are turned off. That is your case.) The numbers range from 13mA to 107mA, depending on the CPU frequence, which peripherals arRead more

    Hi,

    You can find this information in the ESP32- S3 datasheet, Table 4- 9″ Current Consumption in Modem- sleep Mode”.( Modem- sleep mode is the mode where the radios( modems) are turned off. That is your case.)
    The numbers range from 13mA to 107mA, depending on the CPU frequence, which peripherals are enabled, and what the CPUs are doing. For example, if the CPU frequency is 80 MHz and both cores are running, the current consumption would be in the range of 33 to 47 mA.

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vikas Nagpal
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vikas Nagpal
Asked: September 8, 2022In:
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What’s the difference between WiFi and WLAN?

What’s the difference between WiFi and WLAN?

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frequencyradiowifiwlan
  1. Vipul Verma

    1. WLAN is a type of computer network in a relatively small area that dismisses the use of physical means of inter-connectivity. 2. WI-FI is a trademark name to brand devices compliant to IEEE 802.11 standards. 3. Devices in a WLAN essentially use WI-FI branded products. 4. A WI-FI ready device simpRead more

    1. WLAN is a type of computer network in a relatively small area that dismisses the use of physical means of inter-connectivity.

    2. WI-FI is a trademark name to brand devices compliant to IEEE 802.11 standards.

    3. Devices in a WLAN essentially use WI-FI branded products.

    4. A WI-FI ready device simply means that it is ready for network operation within a WLAN.

     

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vikas Nagpal
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vikas Nagpal
Asked: August 29, 2022In:
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Hello, I’ve enforced OTA on ESP32 through WiFi by setting up server on ESP32, and likewise through WiFi by using http. Now I want to do OTA with http but through GSM network. I’ve enforced ESP32 SIM800L module communication to the pall, ...Read more

Hello,
I’ve enforced OTA on ESP32 through WiFi by setting up server on ESP32, and likewise through WiFi by using http.

Now I want to do OTA with http but through GSM network.

I’ve enforced ESP32 SIM800L module communication to the pall, so my GSM connection is good.

Can any bone please let me know of an illustration for OTA on ESP32 through GSM?

Thankyou.

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esp32gsmotasim800lwifi
  1. Alex thomas

    There's no difference between doing it through GSM or wifi or ethernet, any http functions including OTA will just use whatever interface is configured. You should just have to run esp_https_ota( & config) nearly in your app and it'll work.

    There’s no difference between doing it through GSM or wifi or ethernet, any http functions including OTA will just use whatever interface is configured.
    You should just have to run esp_https_ota( & config) nearly in your app and it’ll work.

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vsharma
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vsharma
Asked: July 30, 2022In:
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How to interface a PSoC (e.g. PSoC 63) with a WiFi module (e.g. CY43439)? Is this WiFi-host-driver agnostic to the hardware interface like SPI or SDIO?

How to interface a PSoC (e.g. PSoC 63) with a WiFi module (e.g. CY43439)?

Is this WiFi-host-driver agnostic to the hardware interface like SPI or SDIO?

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psocsdiospiwifi
  1. pallavi sharma

    For the wifi chip that you want to use, driver should have the support or implementation of the interface that you need. For 43439, both the SDIO and SPI interfaces are supported between host and WLAN chip in WHD.

    For the wifi chip that you want to use, driver should have the support or implementation of the interface that you need. For 43439, both the SDIO and SPI interfaces are supported between host and WLAN chip in WHD.

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