Questions tagged [esp32]

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

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17 views

Logic flow for IOT Weighing scale [on hold]

I am trying to develop an IOT weighing scale (AWS backend) for maintaining master batch records for a batch manufacturing process in a chemical production line. The IOT system has a keypad which ...
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1answer
47 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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9 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
16 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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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
51 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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8 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
22 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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0answers
28 views

How do you test 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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32 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 ...
2
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1answer
34 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
56 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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27 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
37 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
69 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 ...
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1answer
52 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
55 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
41 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
145 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
274 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
101 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
157 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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419 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 ...
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1answer
67 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 ...
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0answers
368 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
119 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
613 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
72 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 ...
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1answer
503 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
283 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
84 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
246 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 ...
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75 views

ESP32 - using 3.3V Dual relay

I have an issue- which I guess is has some power issue. I'm using ESP32 and a 3.3v Dual relay. My code is simple ( switch up and switch down ), and works fine. The thing is that when all wires are ...
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2answers
1k views

Number of GPIO pins in esp32 [closed]

I would like to connect sensors with digital signals to ESP32. But I do not know how many pins can be used on ESP32 board for sensors. How many pins are there in ESP32 which can be used for connecting ...
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0answers
910 views

ESP32 - 5V output to operate a Relay

I'm playing around with a new ESP32 flashed with Micropython from eBay in order to replace a Rpi Zero W. Am I missing the 5v output? I need it to operate a Relay. Can a 5vDC Relay be operated as ...
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0answers
54 views

Fail executing RSHELL to acess ESP32 using Micropython

An ESP32 was flashed with micropython, using esptool on Linux system ( Ubuntu 18.04 ). When I tried to runrshell after installing it, it seemed as it start executing, but did'nt reach to login part - ...
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1answer
177 views

S3 Actions from ActiveMQ (IoT Core)

I am working on a code for ESP32 which needs to transfers data that is sent via MQTT to AWS S3 storage. Can Someone help me out on how I can achieve this ? I have setup the the client and AWS broker ...
3
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1answer
409 views

Data from ESP32 to AWS S3

Can someone here help me out with code to send data from esp32 to aws s3 storage ? I am using esp-idf as I have other code running on the esp32 as well. I am new to aws so any help would be good.
10
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1answer
107 views

Need Suggestion HD Camera to be integrated with Wifi module

I am working on one of my IoT project which needs to wide angle HD camera modules to integrated with Wifi Modules (open to Raspberry Pi, NodeMCU or anything else). I have checked various options but ...
3
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0answers
496 views

Websockets with Mongoose on ESP-IDF

I'm trying to use the websocket_chat_client example on ESP-IDF platform but the value of status on MG_EV_CONNECT event is always -1, which is a Connection error. What I've done so far is I took the ...
6
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1answer
66 views

How can I write bytes to BH1750 via line buffer IC (ESP32)?

I want to switch data reading from multiple sensors by line buffer IC (74F244). My problem is I can't read anything from sensor when I connect via IC but can when connect sensor to ESP32 directly. I ...
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0answers
41 views

How can I get the sketch going that came with my TTDO LoRa oled esp32? [closed]

I got this device: https://www.aliexpress.com/item/1-Pcs-TTGO-LORA32-V2-0-433-868Mhz-ESP32-LoRa-OLED-0-96-Inch-Blue-Display/32847499968.html?spm=a2g0s.9042311.0.0.MnBocO It came installed with a ...
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0answers
374 views

Booting up ESP32 normally [closed]

I have an ESP32 chip, not the DevBoard, but the chip only, this one. https://www.olimex.com/Products/IoT/ESP32-WROOM-32/images/ESP32-WROOM32-1.jpg I have a burn board which I use to flash the ESP32, ...
6
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1answer
1k views

ESP32 - How to enable options in PlatformIO

For the ESP32 options are normally enabled with "make menuconfig". PlatformIO with Atom also allows to create ESP32 projects with an empty source folder. It automatically installs an ESP-IDF 0.11. I ...
10
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2answers
707 views

802.11 action frames send and receive in software

Is it possible to gain access to 802.11 action frames TX/RX from software? There's a proprietary protocol based on vendor-specific action frames called ESP-NOW for ESP8266 and ESP32 chips, and I'd ...
2
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0answers
335 views

ESP32 & Bluetooth

I'm currently looking into how to set up a sense network made from ESP32s to track BLE tokens in an area, but I'm stuck at the first step... Getting Bluetooth & device listing to work on the ESP32,...
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1answer
71 views

How can I set up ESP3212 after unpacking? [closed]

Do I need to flash/burn some firmware?Is there a dedicated github page/website?
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3answers
7k views

Working with Rust on the ESP32

I would like to build a gateway device which will use the ESP32. This should connect to the ModBus TCP port of a Sensor. For this purpose, I would like to use the Modbus Rust implementation, which ...