Questions tagged [esp32]
For questions regarding the programming and use of the ESP32 range of microcontrollers from Expressif Systems.
71
questions
1
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0answers
123 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"
...
3
votes
0answers
30 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 ...
1
vote
1answer
38 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 ...
0
votes
0answers
29 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 ...
2
votes
0answers
145 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 ...
2
votes
0answers
33 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,...
1
vote
1answer
40 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 ...
0
votes
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 ...
1
vote
1answer
81 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 ...
1
vote
0answers
56 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 ...
1
vote
0answers
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 ...
5
votes
1answer
706 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 ...
1
vote
1answer
31 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 ...
1
vote
3answers
248 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 ...
0
votes
0answers
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 ...
0
votes
1answer
56 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.
-2
votes
2answers
149 views
3
votes
0answers
35 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 ...
0
votes
1answer
32 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 ...
0
votes
0answers
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 ...
0
votes
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?
2
votes
0answers
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 ...
0
votes
0answers
32 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 ...
2
votes
1answer
63 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 ...
1
vote
1answer
894 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?
0
votes
0answers
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 ...
0
votes
1answer
31 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
�␄@�␀␙␔␄␔␀�...
2
votes
0answers
70 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
votes
0answers
62 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 ...
0
votes
2answers
62 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 ...
1
vote
2answers
51 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
votes
1answer
57 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 ...
3
votes
0answers
172 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 ...
4
votes
1answer
669 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 ...
1
vote
2answers
187 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.
0
votes
0answers
170 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?
1
vote
1answer
123 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....
1
vote
1answer
126 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
votes
1answer
164 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 ...
1
vote
2answers
502 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?
2
votes
0answers
73 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
votes
1answer
373 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 (...
7
votes
4answers
1k 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
votes
1answer
243 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 ...
1
vote
0answers
451 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 ...
1
vote
0answers
2k 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
votes
1answer
163 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
votes
0answers
729 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 ...
1
vote
1answer
270 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 ...
1
vote
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 ...
