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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23 views

TTGO TS I²C adress

I'm working on a project using TTGO TS wich communicate wih arduino via I²C protocole How can I find the adress of TTGO TS board used in I²C communication ?
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Can i run my python based virtual Assistant using esp32? [closed]

I have a working project which is python based virtual assistant and now I am thinking to make it more accessible than carrying my laptop. I want to make a device like alexa echo dot more or less.. ...
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Setting float to two decimal places

I'm trying to set my temperature measurements to two decimal places. Currently what I get are six decimal places. Here is my code: #include "math.h" ... (in loop) temp1 = sensors....
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20 views

BLE scanner and WiFi web server on the ESP32 board

I am trying to put BLE and WiFi web server on the same ESP32 board, using Arduino IDE. However, BLE library is too heavy. It spends about 73% of program size and there no room for WiFi. Program too ...
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29 views

Connect ESP32 via MQTT

For a project I am working on, I need to connect my ESP32 board to another server via MQTT protocol. I am using the Mosquitto MQTT Broker and it is presently on my laptop. Following is the test code I ...
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Automate capturing photograph on ESP32-CAM

I want to capture photographs from the ESP32 camera, but not doing it manually. Specifically, when a signal is sent from a sensor, I want ESP32 to understand that, and start taking photographs ...
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1answer
44 views

Why SSD1306 OLED display get scrambled text when printing messages from separate tasks in RTOS? (revised)

ESP32 with RTOS, test app with 2 independent tasks. Each prints a message to OLED display. Why text gets frequently scrambled? Mutex have been used to share display resource. #define DEBUG_ESP ...
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11 views

Changing the order of GUI-elements inside Arduino ESP-Dash-library

I'm trying to add a new item "index" to GUI-elements that are created by using ArduinoJSON and the Vue.js-framework inside the ESP-Dash-library. The library creates GUI-elements like buttons,...
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1answer
16 views

ESP32S v1.1 NodeMcu vs ESP32 DevKitV1

I have two different ESP32 development boards labelled "ESP32S v1.1 NODEMCU" (A) and "ESP32 DEVKITV1" (B). From what I can tell they have the same major components, but their pins ...
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2answers
26 views

How to webClient.write() an image stored on a String?

My application runs on an ESP32-CAM. It takes pictures and stores to SPIFFS. Periodically SPIFFS is checked and if images are found: 1- The image is saved to a FTP server 2- The image is summited to a ...
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ESP32-CAM brownout detected on broad board power supply but not when using UART USB bridge

I have connected an ESP8266 and ESP32-CAM to a breadboard power supply. The ESP8266 works perfectly as long as the ESP32-CAM is not connected. When I connect the ESP32-CAM to the supply I get brownout ...
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25 views

ESP32 + distance sensor only works when disconnecting & reconnecting cable after code upload

I'm trying to set up my ESP32-WROOM-32D to use an AJ-SR04M ultrasonic sound distance sensor but am having some difficulties. Using Arduino IDE with NewPing and the below code, distance measurements ...
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Does the Sparkfun ESP32 Thing is compatible with generic modules like DHT11 sensor?

First of all I am kind of a noob working with microcontrollers, by the way I am using Arduino IDE 1.8.13 I fallowed the hookup guide to set up Arduino IDE to work with Sparkfun ESP 32 Thing board, and ...
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0answers
18 views

Trouble using bluetooth module with the ESP32s2 feather board

I am trying to use an ESP32-S2 feather board with a separate bluetooth module, the Adafruit BLuefruit LE UART Friend. I previously used this bluetooth module with the Feather M0 Adalogger through UART ...
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39 views

Need documentation for Soil Sensor from DIYmore

Does anyone have any documentation on this device? Im just curious how it work out of the box and how to reference the on board temp and soil sensors. Its a (for lack of a better name)a "ESP32 ...
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30 views

ESP32 ROS unable to sync

I am trying the example ros arduino publisher using an ESP32 Dev Module. When I try to connect using rosserial I get "Uable to sync" error. I have tried using different baud rates, 115200, ...
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1answer
66 views

ESP32 millis not working properly

I have a program which measures temperatures every 30 minutes and sends them to a database. Immediately after running the program the first measurement is sent, however, the second (which should be ...
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1answer
30 views

WS2812B Led Digital Panel Matrix Flexible Screen 8*8. Some LEDs that are not supposed to, switch on

My project is composed of an ESP32, a level converter and two WS2812B Led Digital Panel Matrix Flexible Screen 8*8 (from Aliexpress) interconnected with the provided cable. My objective is to show a ...
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1answer
20 views

Set interrupts that are not GPIO or Timer in ESP32

I am making a project on ESP32. It reads certain sensor values, stores them in RTC memory and sends them by MQTT after a certain time. I wish that it transmits data immediately if there is a ...
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ESP32 reading analog 2.4Ghz

Is there a possibility to analog read on the 2.4Ghz band to just read how much activity is in the presence of your device? Not parsing the messages but just listening to how strong of a signal you are ...
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1answer
96 views

ESP32 Arduino Bluetooth Serial does not reconnect after disconnecting

The basic ESP32 Arduino Bluetooth Serial example pairs and connects as expected, BUT once I disconnect the Bluetooth terminal it stops responding to new events at all, once I reset the esp32, it ...
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ESP32 and moisture sensor transistor switch [migrated]

I'm doing the classic water moisture sensor project with my ESP32, but I want to be able to switch the sensor on and off since that will reduce the amount of corrosion that occurs. Can I use a BC547 ...
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1answer
17 views

SEN0114 moisture sensor low max reading?

I am using the following SEN0114 moisture sensor with an ESP32: https://datasheetspdf.com/datasheet/SEN0114.html How come when submerged in water I only get a reading of ~2500? Should this not read ~...
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1answer
54 views

How can I control 2 servos without an external power supply?

I've been trying to implement a project that's been in my head for a while, I want to wirelessly control my light and fan switches using an ESP32 and 2 servos (one for each switch) through an HTML ...
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1answer
32 views

ESP32 partition table and writing location

In my ESP32 project I have the following platformio.io file: [env:esp32-poe] platform = espressif32 board = esp32-poe framework = arduino lib_deps = openslab-osu/SSLClient@^1.6.7 knolleary/...
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ESP32 OTA: Update.begin() leads to infinite reboots

I'm studiyng the OTA firmware update for ESP32 here. For my application I cannot use a webserver to upload the firmware, but I'm going to setup an external server to provide an FTP or other download ...
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Why isn't my ESP32 staying in Deep Sleep longer than 35 minutes?

I've been having an odd issue with a new custom ESP board. I can't push deep-sleep time past 35 minutes no matter how I adjust the timing. Below is my current pertinent code, but basically the device ...
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59 views

Velux shutter with IO-Homecontrol control over ESP32

I want to controll my Velux shutter with an ESP32 and an transmitter-receiver. I know that the bandwidth is 868 MHz but the problem is the IO-Homekitprotocol, I've read that it has pan 128bit key like ...
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1answer
48 views

How to write & read from SPIFFS file as object data on ESP8266

I am trying write four digit number to SPIFFS file, and read that four digit from SPIFFS file and display on seven segment. The code, I am writing as below, I got "0" on each segment, but if ...
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26 views

I am trying to print items in a structure on aruino and am getting this error on compliation

I am writing a code to measure some sensor values, store them in a struct and print them after a limit. I am using Arduino 1.8.11, programming a DOIT ESP32 DEVKIT V1 Here is my code #include <...
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28 views

How can I capture raw Bluetooth data on a ESP32?

I want to send data from a BBC micro:bit to an ESP32 using microbit's radio because the Bluetooth stack is not available on the microbit. Here is a workaround that shows that there is a communication ...
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20 views

ESP32 Post Request Not Working

This sample code for the esp32 doesn't work. When contacting the website I get a 301 error and the website acts as if nothing was ever recieved. Note: Been using arduino for 2 years. /* Rui Santos ...
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1answer
26 views

Power LED Matrix With LiPo Battery & ESP32

I want to power an ESP32 with a 3.7V LiPo battery. There's a LED matrix of 64 WS2812 LEDs attached to the ESP32. I learned that I need a buck boost converter to power the microcontroller as it needs a ...
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1answer
73 views

use esp32 between two laptop one side usb connection other WiFi connection

I have written this code for esp32 in order to read and write between to computers. One of them is connected via USB and the other is connected via WiFi. Should I use the same port on each? My project:...
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1answer
67 views

No “Huge APP partition scheme” (ESP32)

I recently downloaded the expressif ESP32 library and I'm trying to run the CameraWebServer example. Attempting to compile it results in the following error: Sketch uses 2529577 bytes (192%) of ...
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For an ESP, does the RESET or enable (EN) button always need to be pressed to start the Access Point? How to do it without?

Is there a way to start an ESP Access Point (AP) without pushing a button? All these are set up that way: AP circuits4you AP LastMinuteEngineers AP MicrocontrollersLab AP RandomNerdTutorials
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30 views

Using MPU6050 with ESP32 Cam- MPU Not Detected

Hi I'm trying to build a self balancing robot using my esp32 cam, but so far I haven't been able to setup my mpu6050 with it.I'm using the adafruit libraries with the given example sketches. The only ...
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1answer
63 views

Can't Turn Off Internal I2C Pull-Ups on ESP32

I've designed a custom ESP32 board around the WROVER-IE module. To keep power low, I'm using a GPIO-controlled high-side FET to turn off unused peripherals when in deep sleep mode. The issue: I've ...
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55 views

How to get the esp32s2 recognized as USB device?

I have an esp32-S2 saola and I am trying to use it as a MIDI usb device. I am trying to use this github repository: https://github.com/chegewara/EspTinyUSB. I am able to run the code on the esp32s2 ...
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1answer
55 views

5V pin out, 8 pins and micropython/circuitpython support: does such a board exist?

For a project, I am looking for a board to connect eight different neopixel-strips to, on eight different data pins. Because of the great length between the board and the first pixels of these strips, ...
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28 views

Can ESP32 used for mobile game controller?

I have a term project: I need to develop a mobile game(Guitar Hero Like rhythm game) probably on Unity and I need to develop a custom controller for this game that works on android device. There will ...
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42 views

What does I/O/T stand for in a pinout diagram? (esp32-s2)

I am looking at the pinout of an esp32-s2 board with LCD Display (see picture below) and I am wondering what I/O/T stands for. I am particularly looking at pin IO46 and wondering if it can be used ...
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1answer
41 views

esp32 crashes when trying to dereference a pointer value

I have a websocket listener that is giving me a std::string of my message payload (I want the bytes) and I wrote a function that pulls each of the bytes out and puts them into 32 bit integer variables,...
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1answer
35 views

Explanation of code found online

i found following code online, to read the value of a touch sensor... i am having difficulties understanding how the 2 second timeout on the marked line works.. if ((touch_sensor_value (...
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1answer
30 views

Simple ESP to ESP reading blink program not reading input voltage

One ESP32's 3v3 is connected to GPIO 26 of another ESP32. The program is uploaded. The built-in LED lights for two seconds as expected. Then, it turns off. No matter what GPIO pin the 3v3 is connected ...
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1answer
48 views

Connect multiple Arduinos to ESP32's RTC?

Depending on usage frequency, may get the occasional collision where both test for availability at the same time - if occurring too frequently, maybe add something simple like one arduino only does ...
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change variable configuration using bluetooth device in esp32? [closed]

i am working on a small project in which i have to change the configuration using bluetooth device . to illustrates this if i have LED and led in high when we press "a" and low when we press ...
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1answer
39 views

esp32s: error: 'WDT_TIMEOUT' was not declared in this scope

I am trying to initialize the watchdog timer. I have installed arduino-esp32-master.zip I have #include <esp_task_wdt.h> set but it is not highlighted red indicating the IDE knows about it. ...
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24 views

ESP32 and the Microsoft Azure Device Provisioning Service

I am currently experimenting the the ESP32. In general connecting to WLAN and also to the Microsoft Azure IoT Hub works fine. But unfortunately i coulnt find any information on using the ESP32 with ...
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3answers
179 views

How to read incoming HEX values from Serial.read() method?

Brief description about the problem History Communicating with a old VersaStat II used GPIB port but the GPIB ports PCI card stopped working but there was a another port 25 pin rs232 Serial ...

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