Questions tagged [esp32]

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

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6 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
34 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
44 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
55 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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43 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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25 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 ...
4
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1answer
46 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
30 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
78 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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37 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
33 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
97 views

Can I use Arduino shields with ESP32?

Does any one know - can I use Arduino shields with ESP32?
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34 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
26 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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11 views

How to give an Alexa device wifi credentials on the fly [duplicate]

I have created an alexa controlled smart switch using esp8266 and fauxmo library and it works fine .However I need to set the wifi credentials as well as device name within the code which is not ...
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1answer
30 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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0answers
23 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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29 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
53 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
559 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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15 views

Forming a Network between Lopy4 node and RAK831 Pilot gateway

I want to connect my Lopy4 to my RAK831 pilot gateway. I am using Atom with Pymakr Plugin for the micropython code in Lopy4 microcontroller which is ESP32. I intend to send some packets data from ...
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1answer
23 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
48 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 ...
2
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0answers
58 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
50 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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1answer
35 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 ...
4
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1answer
56 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
106 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 ...
3
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1answer
359 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
144 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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0answers
126 views

What is the reason for RTCWDT_RTC_RESET in esp32?

My device has been frequently resetting with reset reason RTCWDT_RTC_RESET. The output core dump does not show the line at which this happens. What are the resons for this restart?
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1answer
94 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
94 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
121 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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1answer
286 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?
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0answers
53 views

Adding a webserver to eth2wifi example for ESP32

I am interested in using ESP32-EVB from Olimex to run the eth2wifi from esp-iot-solution, using the wifi softap data forwarding demo. If I correctly understand the code, it just moves packets from ...
2
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1answer
258 views

Connecting ESP to USB Port

I have a question about connection from board ESP to USB Port. I can not connect to this port although I setup driver. I use ESP-WROVER-KI. Run on MacOS 10.14 Serial port /dev/ttyUSB0 Traceback (...
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4answers
736 views

Which IoT platform to visualize real-time and historical sensor data?

In order to prepare some tutorials for my students, I am working on a few DIY electronics projects in the field of IoT. I want to use ESP32, ESP8266, Arduino Uno, and Raspberry Pi. I am more deep on ...
3
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1answer
185 views

Which certificate to embed into ESP32?

I'm reading very different things about certificates in IoT. I'm struggling to make a choice on how to manage this. Here's the situation: I'm using ESP32 I don't have much storage available I need ...
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0answers
355 views

ESP32 watchdog errors when I need a loop to constantly stream data

My ESP32 is connected to an NRF24L01 chip where by it receives a stream of audio data. I then relay this information via WiFi over to an MQTT broker. Here's a few parts from my arduino IDE sketch ...
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0answers
1k views

Audio Streaming from ESP32 to Pi

I'm trying to make an audio streamer by using SPH0645 I2S MEMS mic and ESP32 DevKit. I found 2 code, First one is achieved by using MAX9814 Electret mic. The second one is I2S audio streaming but to ...
3
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1answer
136 views

Can I log serial output from ESP32 using Sparkfun's OpenLog?

I am working on a project that largely revolves around the ESP32 WROVER. The device is going to be at a remote location for testing, but I'll need to be able to get the serial output. I think that the ...
2
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0answers
631 views

Simple NAT implementation on ESP32

I have an ESP32 wroom32 that has WiFi internally and an ethernet port. I want to be able to connect my phone to the WiFi and access a webserver running on the ethernet port. Schematically this looks ...
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1answer
220 views

ESP WROOM32- 8 channel relay board confused for which are pins to be use for connect relay

I am new to ESP32, and I had do the same project with Arduino and it's working fine, now I am trying the same project to control 8 channel relays with an ESP32 Wroom 32, but I am not able to choose ...
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1answer
1k views

ESP32 video recording to SD card [closed]

So I'm trying to record a video to SD card using ESP32 with ov7670 but I don't know how to transmit pictures that are taken periodically by the camera to SD card, in a video format. I will later ...
3
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0answers
96 views

Lua for ESP32: How to obtain time from an NTP server or from time.is or?

I'm working with Lua on the ESP32. I see that contrary to the Lua implementation for the ESP8266, there is no NTP module (correct me if I am wrong). I have been looking at the net library, but am too ...
3
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1answer
947 views

Can I use MatLab code in esp32?

We've some method to run the MatLab code in esp8266 microcontroller. We can manipulate Arduino pins using Simulink in MatLab. Can we do the same with an esp32 microcontroller as their code can be ...
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0answers
393 views

Read data from STM32 using UART ESP32 micropython \x00 error?

I am using a LOLIN32 lite (ESP32) to read data sent from a STM32F103 (black pill). The ESP32 is using micropython and the STM32 is programmed using CubeMX + Truestudio. When calling the uart.read() ...
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0answers
91 views

Control GPIO of ESP32 using Bluetooth [closed]

I’m using ESP32 to control relays using MQTT ( both over Arduino and MicroPython ). For special cases, and not for everyday operation, I wish to control a specific GPIO over Bluetooth ( a reset irq)....
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0answers
321 views

ESP32: no signal output on I2C bus [closed]

I have an ESP-WROOM-32 (I2C master) and an ATmega328p (I2C slave, address 0x03) assembled on a prototype pcb using external 6k8 pullups. I'm using the ESP's default I2C pins 21 (SDA) and 22 (SCL) as I ...