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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13 views

FTDI Unrecognized USB device

I connected my FTDI (FT232RL) to my PC, windows 8.1. And it gave me a notification saying "USB device not recognized". However, I thought that the problem is from the cable that I am using to connect ...
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14 views

Can we use ESP32 to program ESP32-CAM

Can we just use an ESP32 NodeMCU for example to program an ESP32-CAM? I saw a lot of people programming ESP32-CAM using an arduino Uno, can we do the same for ESP32 NodeMCU? Of course, in the "Arduino ...
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21 views

Soil moisture sensor, weird readings

I'm having a small problem with my soil moisture sensor it gives me weird readings, in the second the smallest connection is made between the legs it just gives me 4096 (which is max possible value),...
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19 views

ESP8266 EEPROM Reading extra character

I am very very new to ESP Programming. I am trying to store Strings into EEPROM of ESP8266. I am storing the string into eeprom successfully but while reading it from EEPROM extra character 'd' is ...
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31 views

Stream esp-32 camera to RMTP server like YouTube

I am doing research for a project in which I need to play with camera streams. After multiple hit and trails and googling I am not getting even close to the solution for streaming ESP-32 Camera stream ...
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28 views

SPIFFS image does not fit in flash (offset 108MB)

I'm trying to upload an empty SPIFFS image to my ESP32's flash memory via the ESP32 sketch data uploader but I'm getting the following error: [SPIFFS] data : /path/to/my/data [SPIFFS] start : ...
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31 views

Converting the 3.3V PWM signal to 5V PWM signal

I am using ESP32....the max Pwm signal of it is 3.3V...And I have to control two motors speed by TB6612FNG motor driver...when i was using Arduino.. The arduino can send max 5V Pwm signal to the motor ...
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19 views

Connect more than 4 BLE clients to ESP32 BLE Server

I want to create some buzzers connected via bluetooth for a quiz show. I got several ESP32. One of them is the master (BLE Server), the other ESP32s are the buzzers (BLE Clients) with one big button ...
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23 views

Fingerprint not detected

I'm currently trying to integrate my ESP32 Module (as in https://cdn.instructables.com/FOL/YWLI/JEOILQ5U/FOLYWLIJEOILQ5U.LARGE.jpg) with Fingerprint Sensor(R307) using the Adafruit Fingerprint Library....
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47 views

WiFi.begin doesn't work with ArduinoJson's const char* output

I'm using ArduinoJson to parse a file full of JSON strings that contain the SSID and password for the registered networks. I have a little web interface that runs in soft AP mode so you can scan for ...
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1answer
25 views

PCF8575c changes address in I2C Scanner

I want to connect a PCF8575c pin extender to an ESP32, so that I can light 12 LEDs. The problem is that after the connection, when I try to use an I2C Scanner, it shows me a lot of different addresses,...
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Creating a router with ESP32 and SIM800c

I am trying to create a device which is a combination of ESP32 and Sim800c. This device (Master) will start AP mode on ESP32, so that other devices (Nodes) will connect to this AP. The Sim800c will ...
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23 views

ESP32 Bluetooth SPP Max Speed

I am trying to understand the maximum BT SPP transmission speed that can be achieved using ESP32. What my project requires is to send 2bytes of data every 200us (5kHz) AND additional 15bytes of data ...
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26 views

How to use I2S in ESP boards?

I have researched this a lot, but haven't found anything on which I can trust. I want to use a particular ESP board to play audio. To play audio, I2S support is required. But, I know that not every ...
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34 views

Flow control between ESP32 and RS323 device

I'm trying to communicate an RS232 device with an ESP32 (Heltec Wifi/LoRa 32 v2) my problem is that I don't receive any response from the device, doing some research, I'm thinking that the trouble can ...
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45 views

How far can a HC-SR04 can stand from the microcontroller?

I was wondering if I connect a HC-SR04 to an Arduino or any other microcontroller by normal cables, what would be the maximum length of this cable so that the measurements will still be true, and not ...
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189 views

Error 'exec: “python”: executable file not found in $PATH Error compiling for board AI Thinker ESP32-CAM.' in Arduino IDE 1.8.12

I am trying to upload a sketch to the ESP32-CAM board using Arduino IDE 1.8.12 and I get an error message: exec: "python": executable file not found in $PATH Error compiling for board AI Thinker ...
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34 views

Send large files to API via HTTP

I am making a stream-based radio clock that needs to send snippets of the stream to an external API for music recognition using an ESP-WROOM-32 DevKit. The snippets that I record are 15 seconds long, ...
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32 views

How to display CAN BUS information on EPS32 web server?

I try to display the transmitted information from CAN bus on ESP32 web server. I saved the CAN.read() in a buffer receivedChars[i] and try to display the data by client.println(receivedChars[i]);}. ...
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48 views

Esp32 and 74hc595 problem

I am using 74hc595 in several projects where I need more I/O and always worked fine using arduino pro mini or arduino mega. Now I connected same 2 of 74hc595 to an esp32 and does not work. Is there ...
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30 views

Task watchdog gets triggered during Bluetooth initialization

The board ESP32-Dev-WROOM-32D cannot establish a bluetooth connection due to the task watchdog. Here's my code: #include "BluetoothSerial.h" //check if Bluetooth is enabled #if !defined(...
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71 views

Increasing ESP32 AP max connections

It has already been asked how many clients can connect to an ESP32 AP, but the answer is far from clear; the best one is from a year and half ago (ESP32 AP max connections: 4 or 10?) : The answer ...
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51 views

How can I display text on OLED?

I'm trying to print the information, which is received from the other ESP32 by CAN transceiver, on an OLED. The CAN bus is working perfectly, as the 'HELLO WORLD' is already be received. But I can't ...
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18 views

ESP8266 GPIO limitations with HC-SR04

I want to build a systems that measures if some parking spots are occupied or not. I chose to use an ESP8266 12-E NodeMCU Kit with multiple HC-SR04 ultrasonic sensors. In my project, it is essential ...
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35 views

ESP32 HTTPS server - how to get POST request string

I'm trying to set up an ESP32 (DOIT ESP32 DEVKIT V1 in the Arduino IDE, with Espressif's WiFi libraries) with the following includes so far: #include <WiFi.h> #include <WiFiClient.h> #...
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29 views

ESP8266 + Arduino Mega

I am currently carrying out a project where I am using an Arduino Mega2560, to recover data from two ultrasonics sensors (HC-SR-04). For the purpose of my project, I must add HTTP requests to this, ...
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34 views

Why doesn't pin 19 work when powering the EzSBC Esp32 board from batteries?

I recently got an ESP32-01 Breakout and Development Board from EzSBC.com. It is advertised as a board specifically designed for use with batteries because of it's low current draw when in sleep. As ...
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57 views

how to turn on and off 5v relay using ESP32

I'm trying to turn on and off 5v relay using ESP32 Using this code int ledPin = 21; void setup() { pinMode(ledPin, OUTPUT); Serial.begin(115200); } void loop() { Serial.println("High!");...
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60 views

Can't create a RTC_DATA_ATTR var inside a class

I'm trying to create a deepSleep class for my ESP32 project, but I get this error : section attribute not allowed for 'clock_beforeSleep' The only place it compiles, is outside the class. How should ...
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34 views

Components required to control the Speed of Wilo Para AC Synchronous Motor

I want to control the speed of the AC motor based on the temperature set on the Nextion HMI. Right now I have my ESP32 Microcontroller and Solid-state relays which supply the maximum output power of ...
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46 views

Esp32(Arduino Core) + Blynk Wifi Connection Problems

So I am making a football playing robot which consists of 3 servo motors. Currently,i am only checking only a single servo(myservoKicker)which is operated via button in the blynk app and trying to ...
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Wifi communication between ESP8266 (s) and ESP32: know if the client is alive (possibly without errors …) [duplicate]

I state that I am an amateur beginner and this is the first time I ask a question in a forum, so any criticism, judgment or advice is a pleasure for me! I am trying to build an automatic irrigation ...
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16 views

How to change the OUI (Organizationally Unique Identifier) of the WiFiNINA module

There are only examples for ESP32 wifi modules to change the mac address of the device, but I don't know if I can use the same library for the WiFiNINA module. Is it possible to change the OUI of the ...
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452 views

esp32-cam publish image to mqtt

I want to publish image capture through ESP32-CAM to MQTT. Have following code : #include "WiFi.h" #include "esp_camera.h" #include "esp_timer.h" #include "img_converters.h" #include "Arduino.h" #...
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75 views

SIM800L LED is not blinking

I am using a SIM800L Module with esp32. I am using a 3.7V 2800mAh lipo battery to power the sim800L but the LED is not blinking. I am lookng for answers in web but evryone seems to have a different ...
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100 views

To control the relay switching in nextion using esp32 Microcontroller

I have developed the code to control the relay switching on/off using nextion display and esp32. But whenever I press my dual state button in the nextion display there is some delay and I need to ...
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49 views

Can ESP 32 use the wire library exactly like that was in Arduino?

Compare the YouTube video and this webpage, the former one made programming very different in ESP32 and that was in Arduino nano, while the webpage seemed to imply that they work exactly the same. ...
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31 views

How do i send data from a Master to another Master?

I am using an ESP32 to receive data from web. However in an I2C communication, the EPS32 does not work as a Slave and i already have an Atmega as the Master. i have seen sites saying Master-Master ...
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55 views

AutoConnect module does not broadcast SSID on ESP32 Dev Board

This is my first post so I apologize if I'm missing all required info about my Arduino setup. I'm a little new to this type of development. Arduino 1.8.9 ESP32 Dev Module on /dev/cu.SLAB_USBtoUART ...
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86 views

How to print stack trace and register dumps on arduino serial monitor?

I want to debug my ESP32 module which is giving an exception using ESP32 exception decoder, but for that, I would need to have access to my stack trace to paste it. But currently, my arduino serial ...
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84 views

ESP32 - NTP inaccuracy after deep sleep

I'm trying to create a sensor sampling project using ESP32 ( battery, solar panel and temperature affects are not part of test right now to reduce external effects that may cause/ increase such ...
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2answers
166 views

Best way to send I2C commands between Arduino and ESP32

I made a board with an Arduino nano and a ESP32 Dev kit. I connected them via I2C with voltage adaptation. I'm using arduino IDE and the related library Wire.h. I send messages as ascii chars or ...
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42 views

How to get the body of an HTTP request?

I want to read a binary body datas from an HTTP POST request. The context is that I'm making a LED strip controller and I'm currently using this code : #include <WebServer.h> #include <...
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87 views

Set the wall clock time or change GMT offset without ntp server?

I have been able to get the current time from an NTP server and set what appears to be an internal clock using the configTime() function from the ESP32 core. I can then get the current time with the ...
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39 views

ESP32 - Html link

I'm programming a ESP32 modue and I have a code that generates an Access Point and displays an html with two buttons that changes the state of 3 leDs. I want to insert a button that calls a second ...
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39 views

ESP32 WIFI and BLE power status

Regarding the esp32, I am wanting to understand a couple of things related to both wifi and ble power control. 1.) How can I do a status check on whether both the ble and wifi radios are powered/...
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49 views

OTA update for ESP32 in Arduino ide from a different nework

I am trying to use the OTA to update my code in esp32. I have used Web updater so far and it has worked perfectly. But I want to update the code even when I am not connected in the same network with ...
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110 views

Using ESP32 to measure vbat

I'm using ESP32 to read an analog value of a liPo battery (3.7v-4.2v). Since ESP32 DAC's is 3.3v I'm using a voltage divider ( 2x10K resistors ), to split bat's voltage into ESP's GPIO36. So far ...
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54 views

Is there an alternative to strtok_r in extracting words from char?

The task, in char, I get some data that I have to parse into parts. In this case, I use strtok_r, which finds identifiers like "=", " ", "&" Code: char payload[70] = "GET /wifi?ssid=MyWiFi&...
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111 views

Is there an Arduino library that uses ARP to get list of connected devices on network?

I have been looking for a library that can execute an ARP (Address Resolution Protocol) command to return a list of connected devices on the network. The idea is that it would send the request to the ...

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