Questions tagged [esp32]

A cheap and low-power microcontroller family using Tensilica Xtensa LX6 CPU cores with integrated WiFi and dual-mode bluetooth.

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11 views

how to talk esp32 ip local and server in same project [closed]

i want to talk remote control application in mobile with esp32 local and in same project i want to talk smart home with Firebase public how do this
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24 views

ESP32 and wifi router

I connected my ESP32 to Wifi and I can see this in my Wireless Statistics: ID | MAC Address |Current Status| Packets Received | Packets Sent | SSID 1 | 3C: 71: BF: 0D: CB: 00 | Connected ...
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IMU (MPU9250) and Ticker on ESP32

I want to read the data from an IMU (MPU9250) periodically. To do that I use a ticker as shown in the following code: #include <Ticker.h> #include "MPU9250.h" constexpr int ...
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32 views

Crash when disabling bluedroid

i have an ESP32 and i want to use deepsleep when it's not used. Before sending it to sleep i clean up everything, so disconnect, deinitialize and disable everything i build before. But i get a crash ...
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37 views

ESP-NOW with esp32 and esp8266

I want to use ESP-NOW with esp32 and esp8266. The esp32 will mostly send data to esp8266.I was not able to find any good tutorial on YouTube to achieve this. The only videos I found was for either ...
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24 views

USB-C as power input and analog audio out

I currently use USB-C to charge an arduino with a battery. I also use a headphone jack to output audio. I would like to combine those two and output the analog audio through USB-C (when it is not ...
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33 views

Seems like I cant control 4 stepper motor at once

Im trying to control 4 stepper motors with the AccelStepper library. Something like this: AccelStepper FL(1,stepPin,dirPin); AccelStepper FR(1,stepPin2,dirPin2); AccelStepper BL(1,stepPin3,dirPin3); //...
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15 views

ESP32 preferences library: casting byte array back to struct

I'm new to both C and the Arduino framework and having difficulty fully understanding casts. Using this code as an example, I'm attempting to store a struct locally into flash. Code for two functions ...
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32 views

esp32 voltage divider readings off

Trying to read from a voltage divider circuit using two 240 Ohm resistors. Getting a reading of 6.0, when it should be 1.65. Circuit is powered by a bench 3.3V and both the Huzzah32 and circuit are ...
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1answer
36 views

Esp32 not connect with WiFi

I'm trying to connect WiFi at home in my esp32 but in the serial monitor shows a looping connecting to WiFi but never connect. look this The link that I followed. To my application. I want to connect ...
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37 views

legality of streaming data on 868 or 915 Mhz in EU/US

From what I read about duty cycles in the EU there is a 10% limitation (even less in some sub bands). The modules I found have a max. rate of 300 kbps. Even if you max out the duty cycle that would ...
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26 views

915Mhz vs Wifi (speed impact of duty cycle limitations)

I am currently using an esp32 with Wifi. I need at least 15kByte/s constant throughout. This works fine but I am not happy with the range. I came across the RFM69HCW 915MHz module. It is stated with ...
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42 views

max wattage LED for esp32

Simple spec question I couldn't figure out, what is, practically speaking and ballpark, the maximum wattage of LED you can drive with an ESP32 (I guess about the same as an arduino?). Conditions: ...
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41 views

Signal names HiFi

i'm not sure if this is the right address, but maybe you know about it. I currently integrate bluetooth to my car's radio using a esp32. First i wanted to insert the signal at the d2b cd player, but ...
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30 views

Trouble streaming audio from amazon s3 servers

I am experimenting with streaming audio from servers using an ESP32 and this library. I have been able to stream audio from every http server which i have tried but have had mixed success with https ...
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PCA on ESP32 - libraries and recommendations?

it would seem that this would be a commonly sought-after topic, however I cannot find straightforward libraries for this and it's taking too long, so please allow me the question: Is there a good ...
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26 views

Error compiling to ESP32 using Arduino: Operand 2 of 'l32r' has out of range value

I was trying to follow this tutorial and ran into a problem compiling on the Arduino IDE with an ESP32 board. https://eloquentarduino.github.io/2019/12/how-to-do-gesture-identification-on-arduino/ I ...
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U-Blox Neo M8N GNSS-GPS interface with ESP32-TTGO-T-CALL

I have tried contacting the manufacturers as well as many Google searches. I have tried many different libraries to get this GNSS-GPS working. Libraries I've Tried: Arduino_GPS ...
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Is it possible to use CCMP as cipher type on ESP32's softAP mode?

Currently I'm starting softAP mode on ESP32 with WPA2_PSK as auth type(as WPA3 is not supported for softAP). When I am trying to connect my iPhone to the softAP, iOS gives a warning that WiFi security ...
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ESP32 HTTP Server request interrupts Telnet session

I have an ESP32 application that uses a web server as a user interface. For auditing and debugging during development I use Serial; however, that is impractical in the installed system. So, I decided ...
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15 views

ESP32 webserver with hostname and softAP

I was to reach the ESP32-based webserver if its WiFi was in station mode and connect to my router. Now I want to do the same but in AP mode. WebServer _server; void setupAP() { WiFi.softAP("...
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28 views

Az Delivery ESP32 DevKitC V2 PIN names/number

i wonder where to find out the PIN names for the Az Delivery ESP32 DevKitC V2. There is a pin out graphic, but it does not say how the Pin addresses are: https://cdn.shopify.com/s/files/1/1509/1638/...
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27 views

cant read json data esp 32 “parseObject() failed”

hello I am just trying to make Youtube Subscribe Counter with led matrix 32*8 and esp 32 and I had this problem when I trying to get subscribers to count so what is the problem and how I can fix it? `...
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38 views

How to connect a LiFePO4 battery directly to an esp32?

If I want to connect a LiFePO4 battery (as the power supply) directly to an esp32 - would this be the correct way: the plus of the battery to the 3.3 volt pin and the minus to a ground pin?
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28 views

Use Arduino Uno as 5V Power Source for Sensors Connected to ESP32 Microcontrollers

I am using an ESP32 WROVER B based microcontroller, which has 3.3V and 5V outputs. Due to poor soldering of the header and attempted removal of the solder (permanently damaged PCB etching electrical ...
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37 views

Esp32 heating slowly

I made a small little IoT device to control my light chains from my phone, I'm using a MOSFET to turn the power on or off, using an esp32 connected to the MOSFET, both esp32 and light chain is ...
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Why does controlling power with a transistor interfere with MHZ19B's serial communication?

I've been trying to turn off an MHZ19B (datasheet and teardown photos: revspace.nl/MH-Z19B). I've used an Arduino, NPN, PNP transistors and mosfets as well as the diagram below for connecting the ...
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22 views

Bluetooth no COM port connection? ESP32

I am experiencing issues sending serial data via bluetooth with my ESP32. When the device is plugged in, I am able to call bluetooth, and connect to PC and even obtain the serial data via the ...
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34 views

Using ESP32 Cam internal RAM

I am new to the ESP32 series of boards.I powered up my ESP32 Cam board using the Vcc pin supplying about 7.4V using two 18650 batteries only to find out later that was a completely incorrect way to ...
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1answer
318 views

No programmers available for this board - Programming ESP32 Cam with Ardunio IDE

This is my first time working with ESP32 Cam boards. I have followed the instructions as given in this site https://technoreview85.com/how-to-program-esp-32-cam-using-arduino-uno-board/ However my IDE ...
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29 views

Esp 32 keeps disconnecting from com port

I was trying to upload a blinking coding that was in Arduino IDE but the Arduino IDE can not detect my Esp32 but when i press "EN" i manage to get connection but when i letgo the esp32 ...
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45 views

Using esp-wroom-32 without a development board

There are lots of examples on the internet on how to build Arduino from scratch such as IN THIS LINK. I will like to do the same but with the esp32. I have this development board: And I am able to ...
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Problem with a class? SHT21 library

I am using ESP32 and SHT21 temp+humidity sensor but while compiling the code I get the following error: variable "SHT21" is not a type name I see an SHT21 class defined in the SHT21.cpp ...
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24 views

Two sensors on same ESP-32 board

Need some help on the project I'm currently developing. I have 3 YF-B2 sensors that I need to connect to the same ESP-32 board and read the data from the sensors and send it via MQTT. I had it working ...
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40 views

ESP32 softAP SSID not const

I would like to be able to set the wifi SSID in the setup(), so I can customize it based on the MAC address or something similar. (avoiding to ESP's with the same code having the same SSID). However ...
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37 views

Arduino ESP32F-TFT-1.44 Driver

Datasheet https://github.com/espressif/esp-hosted/files/5190376/ESP-32F.pdf The below code is not working. I can see only White screen #include <Adafruit_GFX.h> // Core graphics library #...
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39 views

Get deceleration (negative acceleration when apply brake force)

I want to build a device to measure deceleration force when a car brakes. I am using a MPU6050 for get data and I read from it acceleration on X,Y,Z axes in m/s2 and also it gives me gyro in degrees/...
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27 views

Knowing if ESP32 wakes up itself or manually

I have a project where I put an ESP32 to deep sleep for a certain amount of time, eg: 1h To be able to self-awaken a cable must be connected from GPIO 16 to the reset pin, so basically the ESP pulls ...
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18 views

ESP32 send UDP packets from both cores

Im using AsyncUDP in an ESP32 project, where I initialize AsyncUDP udpSender and call udpSender.write(sendbuffer, sendbuffer_size) from both cores, with different buffers on each core. One core is ...
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28 views

ArduinoJson is not adding string to JsonObject. ArduinoJson broken?

So I've got this code String GetTimeString(){ strftime(dateArray, 100, dateFormat, getTimeInfo()); dateString = String(dateArray); Serial.println(dateString); return ...
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69 views

Need help: Cast from 'char*' to 'uint8_t {aka unsigned char}' loses precision [-fpermissive]

I'm trying to convert the string that I receive from the Websocket to uint8_t that I can copy to the data bytes of CAN protocol frame. I'm using an ESP32 chip and programming it on an Arduino IDE. The ...
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36 views

Error occurs when compiling ESP32 self-update firmware code

when i write this code in esp8266, it's work fine. but when i tried that code in esp32 with some changes,it shows error on compile time: board which i use : DOIT ESP32 DevKit v1 error is: In file ...
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Adafruit IO + Esp-Now

So i am using adafruit io and esp-now on an esp32 to recieve voice commands from the internet and sensor values from another esp32. Independently, they both work quite fast but together the esp-now ...
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35 views

Designing Class Based Code on ESP32-8266

I have some questions about modular embedded systems codes and its usage. I am building an IoT Systems with esp32 now. To learn professional approaches for embedded systems, I have split codes to ...
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90 views

Powering an esp32cam by a battery

I have an esp32cam that I've programmed and powered via an FTDI connected to a computer's USB. Now that this stage is over, I'd like to run it portably, using some sort of battery. The esp32cam has a ...
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41 views

A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header

rst:0x10 (RTCWDT_RTC_RESET),boot:0x1f (SPI_FAST_FLASH_BOOT) flash read err, 1000 ets_main.c 371 I am getting this error in my esp32 devkit v1 How to solve it? I am using arduino IDE for programming ...
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Get client information on BLE

So I'm working on a personal project using bluetooth abilities to start a BLE server and want to automatically retrieve a client's information after it's connected: ID so I can keep track of clients, ...
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60 views

Send only one packet from one ESP32 to another ESP32 without acknowledgment

I have a network consisting 10 slaves and one master. I am using ESP-NOW to send the messages between the nodes. All of the nodes are within close proximity. I do NOT need a mesh network to reach all ...
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12 views

ESP32 BLE Send Receive Example

In my past projects I created tcp server-client architecture to communicate mobil apps. For instance, I created an AP on ESP8266, mobile phone connects to AP send some data then esp8266 send response ...
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36 views

Neo 6M + ESP32 unable to take a fix on battery but works fine with laptop USB

I am using Neo 6M GPS module with ESP32 and 2 X 3.5V(7 v in series) 18650 lithium ion battery stepped down to 5V using LM2596 buck converter. Problem which I am facing is when I power ESP32 using 5V ...

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