Questions tagged [esp32]
For questions regarding the programming and use of the ESP32 range of microcontrollers from Expressif Systems.
84
questions
2
votes
1answer
29 views
ESP32 proximity detection - how near, far and how accurate can it be?
I did some brief search on the matter, but it doesn't really help. I want to detect when people approach each other too closely, and - possibly, in the future - leave too great a distance between one ...
4
votes
1answer
55 views
Best way to set up a portable local IoT network?
I'm working on a project that requires multiple ESP32s to be able to receive a signal from a smartphone in order to close/open a set of doors. The catch is that this will be happening in a remote area ...
3
votes
0answers
16 views
Digital read from ADC2 pins when wifi enabled in ESP32
Is it possible to get a digital input from ADC2 (GPIO - 0, 2, 4, 12, 13, 14, 15, 25, 26, 27) when wifi is enabled in ESP32?
5
votes
0answers
76 views
How could I use ESP32 for realtime wifi voice streaming?
I have an ESP32 with OV2640 camera and a GY-MAX4466 amplified electret microphone module and I would be able to connect it to ESP32 to stream voice and video in realtime when I connect to its IP, ...
3
votes
0answers
40 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 ...
1
vote
0answers
33 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 ...
3
votes
1answer
66 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.
...
1
vote
0answers
33 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 ...
3
votes
0answers
108 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 ...
1
vote
2answers
40 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
votes
1answer
44 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.
...
4
votes
1answer
55 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>
...
1
vote
1answer
125 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.
...
2
votes
1answer
50 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 ...
1
vote
0answers
49 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 ...
3
votes
2answers
65 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 ...
1
vote
0answers
1k 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
85 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
42 views
MQTT Client as “Server”
IĀ“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
129 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 ...
5
votes
1answer
600 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
54 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
43 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
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 ...
1
vote
1answer
185 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
116 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 Iād like to publish from BLE (nRF52840) To AWS IoT using MQTT, but this device doesnāt ...
1
vote
0answers
31 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
4k 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
43 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
1k 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 ...
1
vote
1answer
102 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
259 views
3
votes
0answers
41 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
39 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
1answer
33 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
27 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
52 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
67 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
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?
0
votes
1answer
39 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
ļæ½ā@ļæ½āāāāāāļæ½...
3
votes
2answers
182 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
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 ...
1
vote
3answers
85 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
58 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
64 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
289 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 ...
6
votes
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 ...
1
vote
2answers
283 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.
1
vote
1answer
190 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....
