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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92 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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36 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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135 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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292 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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223 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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468 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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53 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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311 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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100 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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46 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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100 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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457 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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103 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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329 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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127 views

ESP Web Server calling javascript function

Is there a way to call javascript functions from ESP? I don't want to call ajax requests every few seconds. I want to update my values only when they change. Can it by done? Thanx.
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942 views

ESP32 documentaiont for “time.h”

I am working from the example sketch in that installed with the ESP32 Dev Module into the Arduino IDE. It includes <WiFi.h> and "time.h". I have a number of questions about how to use the ...
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38 views

Record stereo audio from two Bluetooth headsets

I've been playing with Arduino for a few years, but I'm new to Bluetooth and streaming audio. I'd like to develop (or assemble or buy) a device for recording stereo audio from a pair of Bluetooth ...
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167 views

SD Library function doesnt work while using second SPI port with ESP32

i work on a group project with an ESP32. We have a lcd display and a sd card connected via the two SPI ports of the ESP32. The card gets initialized with no problem using this code: bool ...
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57 views

Is it possible to get values only during vibration/movement from an Accelerometer(ADXL335/MPU6050)?

I'm trying to make a wearable motion sensor using ESP32 board and ADXL335 Accelerometer. Presently when I'm serial printing the output I'm getting the tilt value as well, which have different values ...
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309 views

Information about 'Arduino Nano 33 IoT'

blox w-102 is based on esp32** which (Esp32) can be used as a standalone chip for projects. Here I want to know how w-102 and samd21g18a are communicating with each other. If they are communicating ...
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1answer
303 views

How to connect ESP32 to HC-06?

I am making a small project (BT controlled "tank") and need to connect ESP32 with HC-06 (ESP32 will be in controller and HC-06 in the vehicle). Android phone communication with both ESP and HC-06 ...
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1answer
134 views

json format in esp32 with arduino json

I am using an ESP32 module for bluetooth connection and scaning wifi network. But I cannot format the json using arduinojson library in the way I want. void scanWifiNetworks() { //creating json ...
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74 views

How to make BLE data accessible to a particular app?

I used the BLE example from here. But any device can read and write to the advertised characteristic. Is there a way to make the data inaccessible to other devices except for my app somehow. What I ...
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661 views

esp32 arduino wifi disconnect

I have this code running on ESP32 connected to SVM30-J #include <WiFi.h> #include <PubSubClient.h> #include <Arduino_JSON.h> #include <svm30.h> // Replace the next variables ...
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139 views

make EEPROM.h use custom eeprom partition

I created the below partition table for an esp32 and replaced the 'default_8MB.csv' with it. # Name, Type, SubType, Offset, Size, Flags nvs, data, nvs, 0x9000, 0x5000, otadata, data, ...
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799 views

ESP32 seconds from epoch

When using ESP8266 - getting seconds from epoch is done using NTP.begin(NTPserver, 2, true); delay(delay_tries); time_t t = now(); while t stores amount of seconds from 1-1-1970. When trying to do ...
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122 views

Convert C string to C++ string

My program is running on ESP32. I'm retrieving some data from Bluetooth, and the Bluetooth string is a C string. I need to save that data in an RTC_DATA_ATTR String, which is a C++ string. Just doing ...
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230 views

SPIFFS file append does not work when adding data in JSON format (ESP32. ArduinoJSON v1.6)

There is a file "/transact.txt", which stores the following data: { uid: 123456789 time_start: 2019-12-22 10:35:00 time_stop: } The challenge is to replace the contents of time_stop without ...
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51 views

Overflow while working with SD library

i am currently working on a Project with an SD card. I want to open a .csv-file on my sd card (later it should be the last file) and then read the ID that is at the start of the .csv-file. Yesterday ...
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674 views

ESP32 Hardware Serial Flow control and full espressif/arduino-esp32 support

I have a similar issue. I want to use the ESP32 with RS485. I have used the Arduino and this works well assigning pins, but it seems not to allow full use of the UART. I see the new uarts in the ...
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45 views

Program the Arduino Due with the ESP32

I'm trying to do OTA firmware updates for the Arduino Due with the ESP32. Now so far I'm able to get the firmware from a website and transfer it over UART. Now I'm looking to get the firmware and ...
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43 views

Lolin D32 Pro board with OLED SH1106

Just starting a project and wanting to connect Lolin D32 Pro board with OLED SH1106. The screeen works with my Arduino Nano no problem however I can't seem to get it working on the D32 Pro. I tried ...
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1k views

ESP32 CAM failed to get frame in time

So I think the title says it all. I recently purchased an ESP32 CAM in India for a pretty cheap price. It looks like an AI Thinker but doesn’t have the tag on the chip itself. Nonetheless, to get it ...
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196 views

Why does the reading on the ESP32 read max, when the reading on UNO read accurately?

I have a 'Capacitive Soil Moisture Sensor' hooked up to my Uno. Very simple code. AnalogRead(MoistureSensorPin); This will return a differing value that I can work with. When applying the same code ...
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99 views

How to burn a firmware to ESP32 Devkit V1 by using MacBook Pro with USB Type C Adapter? [closed]

I need to burn a firmware into the ESP32 Devkit V1 by using the MacBook Pro running macOS Catalina with USB type C port only. I get the USB type C to type A adapter with data transfer/sync and connect ...
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385 views

ESP32 CAM sending a file via POST method

I'm using HTTPClient.h for sending the image file that taken by ESP32-cam, but it sends just headers. the important part of code : File fsUploadFile2 = SPIFFS.open("/picture.jgp", "r"); ...
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122 views

esp32 with Neo6M gps gives no data

I am simply using the following code void setup() { // put your setup code here, to run once: Serial.begin(115200); // set the data rate for the HardwareSerial port Serial2.begin(115200); } ...
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141 views

ESP32-CAM interfacing with CCS811+HDC1080+BMP280

I want to measure Temprature, Pressure, Humidity and CO2 in a room with ESP32-CAM & CCS811+HDC1080+BMP280 Since this module is combination of 3 sensors. Can I integrate it with ESP32-CAM over ...
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1k views

ESP32-Cam No Response and Unable to Program - Timed out waiting for packet header

I recently purchased an ESP32-CAM but have had no luck in programming the board or getting any response whatsoever. I first tried to program it using the an FTDI programmer and the Arduino IDE (...
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40 views

ESP32 doesnt save every string to SD Card

My code initializes, the header (the ID; Value string) for the .csv file gets saved, but the dataString which is the most important part doesnt save to the .csv file. I get an arraypointer to the ...
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279 views

ESP32-CAM not reading BME680

I am trying to read BME680 on ESP32-CAM with following code : (Before trying BME680, I have suscessfully connected BME280 to ESP32-CAM over S/W SPI) #include <Wire.h> #include <SPI.h> #...
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357 views

I get the following error while using esp32

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff0018,len:...
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1answer
314 views

ESP32 saving data to SD card in .csv doesnt format correctly

i want to save a vector to a .csv file on a SD Card. I watched this tutorial on how to do it and it describes it perfectly even though its kinda dated. My Problem is that everything is saved into ...
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247 views

Sparkfun ESP32 WROOM Thing Plus Deep Sleep & Interrupts codes “marriage” problem

Would like to ask for assistance. Tried several routes. My knowledge is lacking and unable to progress further. I think I am very close to the solution (maybe couple of lines of codes away), but the ...
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22 views

detect a dropped tcp connection

Is it possible to detect a dropped connection using WiFi server? Example: Windows disables the Ethernet connection to the ESP during an active connection. After re enabling the connection it is not ...
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1answer
915 views

publish json data to mqtt

I am trying to publish JSON data to mqtt with following code snippet #include <Arduino_JSON.h> JSONVar data; data["temperature"] = temperature; data["humidity"] = humidity; data["pressure"] = ...
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1answer
167 views

Publish chipid to mqtt using ESP32-CAM

I have been trying to push the data of temp, humidity, and pressure from a sensor to MQTT using ESP 32Cam, and was able to do using the following code: pressure = bme.readPressure(); //Convert the ...
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147 views

ESP32 using APSTA mode and LR simultaneously

I'm currently playing around with the LR mode for the ESP32. This lowers the data rate and increases the range apparently. But according to the sketch I use: void init_wifi(wifi_mode_t mode) { ...
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202 views

esp32, brownout on 3.3v?

I'm using a powerbump, input: 3.7v-6v Outputs: 3.3v, to provide the power I'm using 2 CR2025 coin cell batteries(3v each), meaning the powerbump gets 6v, the esp gets the exact 3.27v(I've measured ...
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57 views

connection to ESP using pyVisa

I'm building a small LXI device using a the OLIMEX ESP32 POE Board. Sending commands to the device using pyVisa works fine, but queries don't. Only the IDN? query works. From the ESP I get the ...

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