Questions tagged [esp32]

For questions regarding the programming and use of the ESP32 range of microcontrollers from Expressif Systems.

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28 views

ESP32 transmit data over BLE VS Wifi

I am working on a project where I have got an ESP32 device (Wifi & Bluetooth), which reads data from some sensors, such as temperature and soil moisture (outdoor environment). The data is then ...
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16 views

MQTT BLE Mesh Networking

Can I use BLE to send data through mesh network? And is it possible to store the data using MQTT?
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18 views

Does the LilyGo TTGO T-Camera Plus ESP32 dev board have a speaker?

Related question : (Dev) board to develop my own Amazon Ring(tm) -like doorbell. I am unable to find out if the TTGO T-Camera Plus has a speaker, though which I could play audio which the ESP32 ...
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1answer
46 views

Board to act as a hotspot and connect to Internet

Please excuse the very vague title, I had no idea how to condense my question into a title. Unit A - ESP32 Unit B - what I am looking for HOME_WIFI - The wifi network broadcasted within my home. ...
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30 views

Using more than one channel Relay with ESP boards starts fluctuations after 4-5 minutes

I'm new to IoT. I'm trying to connect more than one device to relay and control via ESP board(tested with esp8266 and esp32), I'm using mqtt connecton for signaling. So here's whats happening If I ...
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28 views

Connect an esp32 with AWS MQTT with SIM800L

I am are trying to use a sim800L module to connect an esp32 running Arduino to AWS MQTT. I need to connect and publish and subscribe to topics. I am doing this successfully via wifi. Not via the ...
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2answers
33 views

How to control an ESP8266 via the Wi-Fi?

Summary I would like to build (ideally based on ESPHome) a device with a buzzer I can trigger remotely via the network. Context I have several systems built around my home automation system: Home ...
2
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1answer
36 views

IoT Dashboard for customers (data comes from Arduino)

I push my sensor readings from product A, B, C, D to an online cloud provider. Then my customer (call him E) needs to access all these sensor readings and make a dashboard for his customer X, Y Z. ...
3
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1answer
52 views

How to save more than one line in SD card memory

I am trying to store certain text in SC Card memory, but the SD Card save the last line or it does not work at all I'm working with ESP32 microcontroller this is my code #include <SPI.h> ...
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1answer
58 views

ESP OTA from Github

I want to be able to program my ESP32 (same for ESP8266) remotely, I have used ArduinoOTA without problems, and I can upload the file into the ESP selecting the local file that I want to flash. ...
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1answer
37 views

How can I increase the size of the receiving sms Buffer in GSM

Recently I am working on programming IoT Project, to receive messages from the phone. That part worked, but the problem that I am currently facing is that the message does not arrive fully because of ...
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32 views

Securing wifi SSID and password during provisioning

This is yet another provisioning BLE/Wifi question. We are looking to secure the initial communication between our mobile application and smart device (esp32, ble and wifi). We want to make this as ...
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2answers
49 views

ESP32 always high pins screwing analog measure

TL;DR When trying to use some pins of my ESP32 to read analog signals, it turns out those pins have a non-zero voltage, messing up the measurements. Why? I got myself an Olimex ESP32-POE-ISO (see ...
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835 views

esp-idf - mqtt ssl example certificate error

I'm having some trouble with mqtt ssl example on esp-idf ESP32. Example: mqtt_ssl If I test it with the default broker "mqtts://mqtt.eclipse.org:8883" and default certificate "mqtt_eclipse_org.pem" ...
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57 views

ESP IDF Data backup to NVS when power goes off

I am using esp-IDF library and esp32 for smart lighting. I want to maintain the state of the lights when power goes off as it can be written somewhere in NVS. Such implementation is available for ...
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1answer
40 views

MQTT Client as “Server”

I´m currently working on a project where I have some clients (ESP32) which should communicate over MQTT with my broker. It should be also possible to change some parameters with an app. The easiest ...
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90 views

Connecting ESP32 to Google Cloud IoT Core (using Google Cloud IoT Device SDK and ESP-IDF

I am trying to send data from Google Cloud Firestore (via Google Cloud IoT Core) to an ESP32 device. I have follwed this guide, using the option of using Google approved way of Google Cloud IoT Device ...
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363 views

ESP32-CAM Camera init failure, SCCB write failure

I can successfully flash my ESP32-CAM to do the blink demo but when I try to run the code below I get the following error (b/t the asterisks/bar.) It seems the "Serial Camera Control Bus" (SCCB) is ...
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37 views

SSID and Password Updates OTA ESP32

I am trying to build an application like Wemo App for learning purpose and I am stuck at a place. I am using ESP32 for this learning. In the future, it can be ESP8266 or any other. In the wemo device,...
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1answer
41 views

Testing range for WLAN IEEE 802 11b/g/n

Are there any standardised test standards to test the Wifi Range of my ESP32 inside of my products enclosure. I want to know what range(s) it can operate so I can provide recommendations to users of ...
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1answer
48 views

Way to connect to connected objects from outside without configure internet box [duplicate]

I don't really understand the way the things works: How connected plugs can be switch from an external device (not in the local framework)? I understand that a way is to configure personnal internet ...
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1answer
143 views

What is the difference between Texas Instruments CC3235sf and ESP32?

I have used esp32 in my projects and its easy to use. But I want to try using CC3235SF. But how does it work exactly? It has on-board RAM and 1MB Flash, so does it mean I can program it directly like ...
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78 views

Can I use ESP32 as a proxy to connect BLE device to AWS IoT cloud? [closed]

Reading AWS IoT documentation I see that the proxy could only be an Android or iOS device. To be more precise I’d like to publish from BLE (nRF52840) To AWS IoT using MQTT, but this device doesn’t ...
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28 views

Creating a Non Blocking socket for making GET requests

I am using an ESP32 with a MicroPython Firmware and want to make asynchronous HTTP requests such as GET request. I have tried using usocket but it did kept throwing OSError 128. I have attached my ...
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1answer
2k views

How to transfer data over bluetooth between ESP32 and Android?

I have trying to find examples for codes to exchange data over bluetooth between esp32 devkit module and an Android device. I want to use SDP to broadcast a service and then make my Android app ...
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1answer
40 views

How to use Grove Connectors with the ESP-WROVER-KIT-VB development board?

I am plug & play, non-soldering type. As such, I love Grove Connectors. Does anyone know of a non-soldering, preferably non-breadboard, way to use them with the ESP-WROVER-KIT-VB development ...
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3answers
760 views

Is barcode scanning with an ESP32 possible?

Is barcode scanning with an ESP32 possible? Is there an existing project, of a library that I could use? Any idea how to go about it? If not feasible, would it make sense to stream video from the ...
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38 views

Why MCU can connect to WiFi network and computers cannot?

I was testing a system based on some devices connected to a WiFi network. There are 3 devices that make part of the system: A raspberry Pi, an ESP32 and a laptop PC. The raspi acts as a Apache server ...
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1answer
84 views

ESP-WROVER-KIT-VB - seeking code example to write to display

Does anyone have a simple "hello world" example of writing text to the display of a ESP-WROVER-KIT-VB ? My search skills are failing me today.
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2answers
206 views

Can I use Arduino shields with ESP32?

Does any one know - can I use Arduino shields with ESP32?
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37 views

Is there any solution to run any RTOS on windows/linux virtual machine?

I am writing firmware for different boards supporting FreeRTOS, Zephyr, ... My problem is when I am developing the firmware, I should run the firmware on the "real" device from the beginning and ...
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1answer
33 views

Can I compile Python on my PC, load it to an ESP32 and run it?

As a follow-up from Can I retrieve a Python program from an ESP32?, I would like to make things a little more difficult for those who would steal my code (I do realize that I cannot prevent it). Can ...
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1answer
32 views

Can I retrieve a Python program from an ESP32?

As per the title. If I have an ESP32 with some Python loaded, and have lost the source, can I retrieve it from the ESP32?
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26 views

Which IDF to choose for ESP32 developent team

I and my friends are getting started with ESP-IDF. We want to get familiar with Embedded C development and ESp32 seemed to be a very good candidate for our later needs. The problem is there are ...
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36 views

How to remotely devleop on an ESP2 using PyCharm Community Edition?

JetBrains PyCharm blog announed a MicroPython plug-in for PyCharm. Alas, its GitHub page says The plugin supports these devices: BBC Micro:bit ESP8266 PyBoard Np ESP32 :-( Can one remotely ...
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1answer
66 views

Stream ADC values from ESP32 over http

I have an ESP32 recording values from an ADC at a rate of 1 sample/second. I need the ESP32 to send new values to a device (let's say a smartphone app for now, eventually via a server), as they are ...
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1answer
1k views

ESP32 Cam send picture to cloud AWS [closed]

I am trying to figure out how to convert an image to base64 on the ESP32 Cam board so I could then send it to AWS s3 bucket. Could someone please give me some insight?
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1answer
33 views

Heltec WiFi Kit 32 and PlaftormIO configuration (baud rate?)

I am just getting started with PlatformIO and have chosen a Heltec WiFi Kit 32. I loaded the PlatformIO demo espidf-http-request, built it and loaded it, but the serial terminal shows �␄@�␀␙␔␄␔␀�...
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0answers
102 views

Can somebody explain why some pins on Olimex ESP32-EVB cannot be used?

I am in need to configure two UART connections from Olimex ESP32-EVB to a scanner and to a card reader. I was exploring the GPIO pins that could have helped to establish those connections, but ...
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0answers
63 views

What are the sensors available to measure liquid levels? [closed]

What is the best sensor which can be integrated with esp32 and can be used to measure liquid level in a tank. I used HCSR04 and JSN but both of them were not good. Are there any other recommendations ...
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2answers
66 views

Seeking ESP32 with display which is supported by the PlatformIO debugger

I am switching to Platform IO as my ESP32 IDE. Alas, none of my boards are supported by the debugger. See https://docs.platformio.org/en/latest/plus/debugging.html#piodebug To save me along time ...
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2answers
56 views

Where to find descriptions of the example ESP32 sketches in the Arduino IDE?

I chose this one at random https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266WebServer/examples/HelloServer/HelloServer.ino but looked at the code of others & hope that there is ...
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1answer
61 views

How do you debug your ESP32 applications?

So, I asked a question on Hardware Recommendations, looking for a Windows USB dongle for LoRa/LoRaWan and BT5/BLE I want to develop on ESP32 and to use my Windows laptop as a server to the ESP32's ...
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0answers
257 views

Powering an ESP32 used for controlling solenoids remotely

Context I am from a software engineering background, so I don't know too much about electric engineering apart from basic stuff like Ohm's Law (but willing to learn if needed). I'm building a garden ...
5
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1answer
1k views

How can I list the partition table of a currently running esp32 devboard?

I am developing on an ESP32 devboard (esp8266, wroom). I need to get the partition table of the currently running device. This document contains a quite good documentation of its partition table. I ...
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2answers
240 views

How to send WIFI credentials to ESP32?

I would like to know what are the available ways one can send wifi creds to esp32 other than using wifimanager.
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1answer
162 views

ESP32: Timestamp cannot be sent by MQTT

for one week I am searching for a solution at my ESP32 project (development over Arduino IDE): In my project I execute the following step: Read Temperature via BME280 Ask time at NTP server (via time....
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1answer
180 views

How to detect current flow in a live wire running at 220V AC, using Esp32

I have a project planned which is related to home automation. I want to be able to control the lights using an app on phone while also maintaining full manual switch control in case the relay or ...
2
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1answer
206 views

Manually initiate time sync in PainlessMesh

I'm using Expressif ESP32 dev boards and the PainlessMesh library. My nodes do an initial time sync, but after a while I've seen odd behavior where the calculated offset is negative... implying that ...
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2answers
719 views

How to test internet connectivity of network to which esp32 is connected?

I want to know if the network to which esp connected has internet connectivity or not. How can I send a ping request using esp32?