Questions tagged [esp32]

A cheap and low-power microcontroller family using Tensilica Xtensa LX6 CPU cores with integrated WiFi and dual-mode bluetooth.

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1answer
190 views

ESP32 start BLE after deep sleep

I'm new to using the esp32 as a microcontroller. I'm currently working on a so-to-say remote control. Since I want to use the esp32 with an external battery I need to put it in deep-sleep after I ...
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121 views

Uno to ESP32 - HardwareSerial repeats value on ESP32's side even though Uno is disconnected

I have an Arduino UNO connected to ESP32 through voltage divider with TX0 from Uno to RX2 to ESP32. My goal is to send data from my Uno to my ESP32 through HardwareSerial. Here's my code for the Uno: ...
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1answer
1k views

ESP32 open “captive portal” on connected

I am using the default example SimpleWiFiServer that comes as an example from the ESP32: #include <WiFi.h> #include <WiFiClient.h> #include <WiFiAP.h> #define LED_BUILTIN 2 // Set ...
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108 views

ESP32 SPI communication with MCP3903 not working

I am trying to read out the Microchip MCP3903 six channel ADC using an ESP32 via SPI communication. The MCP3903 is powered with 5V and 3,3V and is connected with an external 3,57 MHz crystal. The ...
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1answer
140 views

L298N Motor Driver with Nodemcu/ESP32

I have seen a lot tutorials on L298N motor driver with nodemcu and ESP 32, which are 3.3v logic boards where the motordriver is a 5v logic board, now in Arduino while doing speed control 255 means 5v ...
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2answers
95 views

Four temperature SHT31 sensors on ESP32

I have to read out the teperature and humidity of four independent SHT31 sensors with the help of an ESP32. Is there any prefered way to do this, since the only examples I can find online are only ...
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23 views

MPU6050 Accel/Gyro no-interrupt gives erratic accel readings

I am using the Electronic Cats MPU6050 lib to interface with an MPU6050 on an ESP32 without interrupt pin. The basic code reads data from the MPU6050 and then displays it on the OLED However the ...
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1answer
247 views

Reading SNMP V2 OID from ESP8266/ESP32

i need to read from my ESP32/ESP8266 some SNMP V2 OID values from my home printer: it exists a library/method that can do that? I've seen some SNMP agents, but they works only with the devie as server ...
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1answer
159 views

Animation of led strip with ESP32 does not work when WiFi is in use

I am using the ESP32 for a simple project. I know how to animate an led strip using atmega328p with arduino but when I animate it on the ESP32 it does not work that great. It will be nice if I can use ...
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1answer
200 views

ESP32 send data to another ESP32 without establishing a wifi connection

Originally I was creating a project consisting of the Atmega328P and NRF24L01 to create multiple arduinos that could talk to each other. Basically I was creating something like this: As the network ...
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2answers
108 views

Using different processors when it comes to arduino

I decided to learn Arduino in this quarantine so I am still a newbie when it comes to micro controllers. Basically I been doing all my projects based on the ATMEGA328P-PU: I even converted my ...
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137 views

Arduino UNO not sending serial data to ESP32

Lately I've been struggling with Serial communication between Uno and ESP32. I'm trying to send a simple string (In my case "100") from my Uno to my ESP32. I made a voltage divider and I'm ...
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424 views

Reading TCD1304 linear CCD Sensor

I want to read the TCD1304 linear CCD sensor with an ESP32 and I'm facing some problems. As a first "warm-up" and to get familiar with this sensor I tried to generate the sensors input ...
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176 views

BLE comunication between two ESP32s

how can i send data from one ESP32 to another with BLE? I was trying library from nkolban, but i didn't know how exactly should i write the code. All I want is to send a string with 5 characters. ...
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1answer
199 views

Uno - ESP32 SoftwareSerial communication won't work

I have two boards, Uno and ESP32 and my goal is to send data from the Uno to the ESP. I made a voltage divider so my ESP doesn't get fried and I use the communication only in ONE way, strictly UNO -&...
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1answer
122 views

Counting to 1000 In Both cores execution time problem in esp32?

I am trying to count to 1000 with single core and dual core with esp32 but the output(run time) dose not make sense, the time which takes a single core should be doubled compared to dual core in ...
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1answer
1k views

Which board to select in PlatformIO for ESP Wroom 32?

I'm quite new in this microcontroller topic and my next step is to make use of a wlan module, which is a ESP WROOM 32. As IDE I'm using Visual Studio + PlatformIO and I can't figure out how to access ...
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57 views

Temp Sensor not working on ESP32

I am using SHT21 temp sensor with ESP32 using I2C. The sensor only reports temp of -273 and 0 for RH. The sensor is not faulty as I have tried this on an Arduino UNO with the same sketch and it works ...
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3answers
700 views

ESP-NOW and WIFI and OTA at the same time on Sender and Receiver

I am trying to set up two ESP32s so that they can be updated via OTA and at the same time send sensor readings using ESP-NOW, from Sender Board to Receiver Board. For this to work both boards must ...
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0answers
81 views

ESP32-POE/ISO unstable after 10 days of power up

i have one ESP32-POE and ESP32-POE and i'm using the Olimex RS485 module to read a power meter that is placed near the ESP32 (5 meters of CAT5 cable - 9600 8N1). My device has this workflow (it's ...
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193 views

Reduce time between two consecutive SPI transfers on ESP32

I'm trying to drive an external DAC via SPI interface using ESP32 chip. But I cannot achieve the desired speed (>1M transfers/sec, each transfer consists of 16bits). The reason is not the SPI speed ...
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1answer
552 views

How to post image using Arduino HTTPClient

I am using arduino HTTPClient to do the post request in ESP32. Can anyone help me with the part where I will be able to post an image file along with some data. The below code works perfectly fine ...
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971 views

How to download a large text file using Https on an esp32

Trying to create an esp32 access to a public apple calendar, but after connecting to the server and saving to SPIFFS it fails at the same point each time. I end up with a file around 220KB, when the ...
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1answer
860 views

Anyone have example code for ESP32 as media controller for Android/iPhone Media Apps

There's actually another post with this very same topic but no answers on that post. Back in January of 2020, the last commenter said he had sample code and then he went dark without posting the ...
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0answers
491 views

invalid conversion from 'char' to 'const char*' [-fpermissive]

Hi I'm new to coding arduino and I'm trying to check if a get request has the a paramater that is the string '1', but it gives me the error D:\hforr10\My Documents\Arduino\wifi_control_test\...
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1answer
473 views

How to Set RTC in ES32 using NTP server?

I am working on ESP32 And want to set RTC from the NTP server. How can I get epoch value I have done this thing on CC3200 launchpad and used an NTP server library to obtain epoch value.
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1answer
34 views

I2C comunication, ESP->Nano on endTransmission no ACK fron nano

i am trying to communicate between ESP(master) and arduino nano(slave). This is only a prototype and all works fine. But i want to add multiple arduinos and therefor i need to detect if the arduino ...
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1answer
188 views

Esp32: is OTA compatible with FREERTOS

Can I use OTA along with FreeRTOS tasks on ESP32. I ask this because in the following example OTA seems to be enabled if FreeRTOS is disabled. Can for example upload firmware that runs on both cores ...
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276 views

I need an example of how to send AT COMMANDS to SIm7000E GPS+LTE module from ESP32 and reading those response in Serial monitor

Actually I need to make HTTPS post request using SIM7000 and ESP32 but the available libraries don't have a function for HTTPS post request, I wanna make this request using AT Commands. I need a ...
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27 views

How to convert 13 digit EPOCH time into time and date? [duplicate]

Here is my sketch, where the time is in the JSON document: #include <HTTPClient.h> #include <Time.h> #include <TimeLib.h> #include <Wire.h> #include <WiFi.h> #include <...
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39 views

esp32 pico kit - actual clock speed vs crystal vs max_speed etc

I am trying to understand how the clock speed in the esp32 works. I am running arduino ide 1.8.12 with 1.04 board definition - on a pico kit 4 module . The device datasheet says it has a 40mhz crystal....
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46 views

esp32 board crashes

I try to connect sensors to esp32 board. when connecting a sensor, for example, DHT11, but it happens with others as well the board enter into a loop of boots with the following error 19:36:37.440 -&...
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117 views

library problem ? how to solve this?

Arduino: 1.8.11 (Windows 10), Board: "ESP32 Dev Module, Disabled, Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 240MHz (WiFi/BT), QIO, 80MHz, 4MB (32Mb), 921600, None" Multiple libraries ...
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1answer
333 views

ESP32 - DeepSleep loop or not?

I'm trying to create a battery & solarpowered ESP32 for future use with sensors. It connects to Wifi, MQTT, publishes some readings and status messages and go back to sleep. From time to time (can ...
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1answer
429 views

esp32 http client response only 200 didn't receive the data after that

i am using esp32 as a client and using following example. So here i am getting header response only that is 200. I am not getting any response after that. here is the example #include <WiFi.h> #...
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37 views

esp32-pico-4d not working

My power supply is feeding the esp32-pico with 5v tho it says that there is 0 amps power drain, already there I know something isn't working since the power drain should be around 0.080amps, (it can ...
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2answers
705 views

ESP32 - `Brownout detector was triggered ` upon Wifi begin

I'm Using an ESP32 - NodeMCU. One of the MCU's is acting weird upon boot, while at start I thought it was something to do with its sleep cycle. But, it seems that even on a minimal code as shown below,...
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2answers
632 views

ESP32: How to run two independent PID controllers, one per core?

I want to control 2 independent processes with 2 PID controllers. Is it possible to run each controller on a separate core? I'm using this PID library. According to its documentation, the PID::Compute(...
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1answer
440 views

3.3V to 5V PWM level shift

I need to shift a PWM signal from a ESP32 (3.3V) to receiver that supports 5V. The signal is at maximum of 400Hz. Can this shifter do the job ?
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37 views

Is it possible to implement old AVR library onto arduino (specifically, NodeMCU esp8266)

I am a Computer Engineering Undergrad, currently in a cryptography(computer security) course, and I was assigned to do projects about implementing µNaCl library onto Arduino. I currently own a nodemcu ...
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1answer
36 views

Is it possible to send data from internet server to ESP8266 behind proxy or regular requests from ESP8266 are required?

It would be kind of push notification or something like that probably. I can first connect to server and send it any data for "registration"... I found many examples with websockets but all ...
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0answers
155 views

esp32 e-paper driver not working

I am trying to setup waveshare 7.5 display (Waveshare_7_5) with esp32 e-paper driver using ESP32-e-Paper-Weather-Display My code is here https://pastebin.com/raw/2zQDe9a9, have corresponding ...
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1answer
50 views

Arduino exercise that i have no idea how to do

The messages received by the Arduino take the form: $ Ba, Pb, Rc # Where $ represents the beginning of the message, # represents m, and B, P, and R are characters representing B button, P period and R ...
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49 views

ESP 8266/32 - How to avoid immediately turning Off the device with RST pin conencted?

I would like to ask how to avoid the turn of the ESP8266/32 in case the door switch will be in the state closed? I am solving the situation when the doors are opened, the device is booted from the ...
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1answer
143 views

Fail to convert time_T from past to tm struct

Continuing a Question asked few days ago, answered by Edgar, a new question has rised: My goal was using a past time_t value, and convert it into a struct tm variable in order to use it, part as a ...
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1answer
37 views

Voltage issue on an esp32 wvroom 32D development board

I have an esp32 wroom 32 dev board. I'm running into power issues and I'm not sure what's going on. When I try to upload sketches the uploads fail if I have any jumpers running to the 5v or 3.3v ...
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1answer
113 views

Error passing a `time_t` and `struct tm`, ESP32

I need to create a converter from epoch time stored in a time_t variable, to a struct tm variable, in order to check / create a certain task every hour or a day. This function should get also a past ...
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2answers
303 views

Antenna for ESP32-pico-d4

I am currently playing a bit around with the esp32-pico-4d, it does not have an onboard antenna, so an external antenna is needed, tho I don't know a lot about it so a little help would be appreciated....
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2answers
145 views

ESP32 runtime error in 2d array

I am trying to serial print the value of b[0][0]. Has to be zero but it dose not work! Here is the code void setup() { Serial.begin(115200); byte b[321][241]; Serial.println(b[0][0]); } void ...
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1answer
620 views

How do i fix the “A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header”

I have an AI Thinker ESP32-CAM and I've had issues uploading the CameraWebServer sketch, every time I hit upload it says "A fatal error occurred: Failed to connect to ESP32: Timed out waiting for ...

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