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For questions about the ESP32 series of microcontrollers. Use in conjunction with the “microcontroller” tag.

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Trais Saw
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Trais Saw
Asked: November 22, 2023In:
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Hello all,I’m designing a board equipped with ESP32- S3SOC.Wireless function (WiFi & Bluetooth) isn’t used.Is it possible to operate with the built-in PLL without an external oscillator?However, I would like to know the frequence delicacy of the built-in PLL when ...Read more

Hello all,

I’m designing a board equipped with ESP32- S3SOC.

Wireless function (WiFi & Bluetooth) isn’t used.

Is it possible to operate with the built-in PLL without an external oscillator?

However, I would like to know the frequence delicacy of the built-in PLL when not applying an external oscillator, if possible.
I looked in the technical_reference_manual, but could not find any information.

Thank You in Advance

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bluetoothesp32S3SOCwifi
  1. ellasmith

    Hello, No, you need a crystal.   Thank You Ella Smith

    Hello,

    No, you need a crystal.
     
    Thank You
    Ella Smith
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Goldfish
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Goldfish
Asked: October 30, 2023In:
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Hello,I am currently working on a design that involves data logging and saving on a micro SD card using a Fire beetle using an ESP32 WROOM 32D. We presently have it working but I just realized a system of ...Read more

Hello,

I am currently working on a design that involves data logging and saving on a micro SD card using a Fire beetle using an ESP32 WROOM 32D. We presently have it working but I just realized a system of data extraction might not be possible. We wanted to extract the data via the micro USB port the Fire beetle has but when looking into Tiny USB I noticed that it only talks about the ESP32-S2. Is that really the only chip it’ll work with? I am going to try out Tiny USB still but just wanted to see if there were other ways to extract the data from the micro SD card. We were planning on rooting with Bluetooth as well but we really wanted to extract using a cable. I am still new to the ESP world so sorry if some effects are not obvious to me.

Thank you!

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bluetoothcableesp32MicroTinyusbwroom
  1. vikas Nagpal

    Hello, TinyUSB needs USB-OTG, and at the time of writing this comment only the ESP32-S2 and -S3 have that. You can add USB OTG by means of a USB to the Serial bridge chip, which is the CH340. Thank You Vikas Nagpal

    Hello,

    TinyUSB needs USB-OTG, and at the time of writing this comment only the ESP32-S2 and -S3 have that.

    You can add USB OTG by means of a USB to the Serial bridge chip, which is the CH340.

    Thank You

    Vikas Nagpal

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ellasmith
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ellasmith
Asked: September 13, 2023In:
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Hi, I’m working on a circuit based on AiThinker ESP32-C3-13/ 13U- Kit and communicating the ESP32 kit with my computer through GPIO18 and GPIO19. The problem is when I open the COM port on my. In the net operation, MCU resets ...Read more

Hi,

I’m working on a circuit based on AiThinker ESP32-C3-13/ 13U- Kit and communicating the ESP32 kit with my computer through GPIO18 and GPIO19. The problem is when I open the COM port on my. In the net operation, MCU resets and boots itself. So I did some research and found out that the RTS pin is connected to the ESP32-C3 EN pin so when I open the port by my. Net operation on my computer to the ESP32 kit through the COM port, MCU gets a reset signal and reboot.

To answer this problem I set properties as below;

 _serialPort.PortName = port; _serialPort.BaudRate = 115200; _serialPort.DtrEnable = true; _serialPort.RtsEnable = false; // Set the read/write timeouts _serialPort.ReadTimeout = 1000; _serialPort.WriteTimeout = 1000; try { _serialPort.Open(); message = _serialPort.ReadLine(); if (message == "HELLO\r") { // device connected  _serialPort.Close(); statusLabel.Text = "Cihaz bulundu"; return (port); } }
Even though I disable RTS, MCU still resets and boots itself. I tried all combinations for the DtrEnable and RtsEnable properties. But the result did not change.

Anybody can help me to answer this issue?

Thank you

Ella

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aithinkercomesp32gpio18gpio19mcuportserial
  1. Julian White

    Hello, You should set handshake after setting property RtsEnable = true. Use properties as below:- _serialPort.RtsEnable = true; _serialPort.Handshake = System.IO.Ports.Handshake.RequestToSend; _serialPort.RtsEnable = false; Thank You

    Hello,

    You should set handshake after setting property RtsEnable = true. Use properties as below:-

     _serialPort.RtsEnable = true;
_serialPort.Handshake = System.IO.Ports.Handshake.RequestToSend;
_serialPort.RtsEnable = false;

Thank You
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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: August 7, 2023In:
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Hi, I’m using an ESP32 controller, and I want to design the antenna on my PCB board, Can I get the antenna design details? Thank You

Hi, I’m using an ESP32 controller, and I want to design the antenna on my PCB board, Can I get the antenna design details?

Thank You

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antennaboardcontrollerdesignesp32pcb
  1. Julian White

    Hello, Here are some things to consider for designing an antenna on an ESP32 PCB board: 01. Determine the frequency range you need. The most common frequencies for ESP32 are: 2.4 GHz for WiFi 433 MHz for low-power communication 02. Decide what type of antenna you need based on your frequency range aRead more

    Hello,

    Here are some things to consider for designing an antenna on an ESP32 PCB board:

    01. Determine the frequency range you need. The most common frequencies for ESP32 are:

    • 2.4 GHz for WiFi
    • 433 MHz for low-power communication

    02. Decide what type of antenna you need based on your frequency range and application:

    A. For 2.4 GHz WiFi, a chip or PCB antenna would work well. Options include:

    • Chip Monopole Antenna
    • PIFA (Planar Inverted F Antenna)
    • Inverted F Antenna
    • Patch Antenna

    B. For 433 MHz, a simple wire antenna would likely suffice.

    Hope this advice on ESP32 antenna design helps! Let me know if you have any other questions.

    Thank You

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Alex thomas
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Alex thomas
Asked: July 12, 2023In:
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Hi, guys. I want your recommendation for AWS IoT Provisioning. I am looking for wifi and ble of EPS Module to connect to AWS IoT Core. I mean this module has wifi and ble. I need it to be ready to use AT Command ...Read more

Hi, guys.

I want your recommendation for AWS IoT Provisioning.

I am looking for wifi and ble of EPS Module to connect to AWS IoT Core.

I mean this module has wifi and ble.

I need it to be ready to use AT Command by the host MCU.

I hope your answer.

Thank You

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awscoreepsesp32iotmcumodule
  1. ashishgawade

    Hello, ESP32-S2 module and Nordic nRF52 module are good options for connecting a module with Wi-Fi and BLE capabilities to AWS IoT Core. The AWS IoT Embedded C SDK and AWS IoT Device SDK for Embedded C give easy-to-use APIs for device authentication, shadow management, and MQTT messaging, and you caRead more

    Hello,

    ESP32-S2 module and Nordic nRF52 module are good options for connecting a module with Wi-Fi and BLE capabilities to AWS IoT Core. The AWS IoT Embedded C SDK and AWS IoT Device SDK for Embedded C give easy-to-use APIs for device authentication, shadow management, and MQTT messaging, and you can apply AT commands for communication with a host MCU.

    Thank You

    Ashish

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sachinsharma
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sachinsharma
Asked: July 1, 2023In:
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Hi everyone, Is it possible to use the USB port for both JTAG and Mass Storage Devices (or CDC)? This can either beIt enumerates as a composite device For the first 10 seconds of booting it’s JTAG, but also switches over to MSD ...Read more

Hi everyone,

Is it possible to use the USB port for both JTAG and Mass Storage Devices (or CDC)?

This can either be

  • It enumerates as a composite device
  • For the first 10 seconds of booting it’s JTAG, but also switches over to MSD if nothing has connected

I’m using the ESP32-S3-Mini and I am using every pin, so I can not use the external JTAG interface.

Thank You

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cdcesp32jtagportusb
  1. nidhi singh

    Hello, Yes, it is possible to use the USB port for both JTAG and Mass Storage Devices (or CDC) on the ESP32-S3-Mini. This can be achieved by configuring the USB device to appear as a composite device, which means that it can present itself to the host as multiple devices at the same time. The firstRead more

    Hello,

    Yes, it is possible to use the USB port for both JTAG and Mass Storage Devices (or CDC) on the ESP32-S3-Mini. This can be achieved by configuring the USB device to appear as a composite device, which means that it can present itself to the host as multiple devices at the same time.

    The first option is impossible, as USB-serial-JTAG (which provides the JTAG connection) and USB-OTG (which can provide the mass storage functionality) can’t be connected to the USB pins at the same time. The second option is viable.

    Thank You

    Nidhi Singh

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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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ashishgawade
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ashishgawade
Asked: June 8, 2023In:
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Hi, I designed to use an ESP32- S3 for a project, where many IO pins will be used. I flash the ESP32- S3 with the integrated JTAG over USB. There are some pins, that I am now doubtful if I can use ...Read more

Hi,

I designed to use an ESP32- S3 for a project, where many IO pins will be used. I flash the ESP32- S3 with the integrated JTAG over USB.

There are some pins, that I am now doubtful if I can use for the specific interface( Strapping Pins and RXD0/ TXD0)

– GPIO0-> Here I want to ensure, that at startup the correct sense is applied( 1in my case)
– GPIO3-> Need floating at startup, so I’ll not use this GPIO
– GPIO45/46-> Need to ensure a sense 0 at startup

So, that should fit so far. But what about RXD0 and TXD0? Can I apply them as I2C with Pull- Ups or are there any restrictions?

Thank You

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esp32gpio0gpio3gpio45iosjtagusb
  1. ellasmith

    Hello, Yes. Be apprehensive that typically there will be some launch chatter on TxD0- if you are applying this pin for I2C and the different column stays idle, this is doubtful to make an issue, however, (similarly note that depending on the module/board, TxD0 may have a built-in 500-ohm series resiRead more

    Hello,

    Yes. Be apprehensive that typically there will be some launch chatter on TxD0– if you are applying this pin for I2C and the different column stays idle, this is doubtful to make an issue, however, (similarly note that depending on the module/board, TxD0 may have a built-in 500-ohm series resistor. It likely will not interfere too important with I2C, but if you are having issues streaming I2C at a high bitrate, it may be because the resistor limits the slew rate.)

    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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