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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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BLE Scan Example using ESP32C3 board and ESP32 Arduino BLE libraries

I'm trying to compile the BLE_Scan example using Arduino IDE 1.8.19, in the ESP32-C3 MCU, but I continue getting the following error: Documents\Arduino\libraries\ESP32_BLE_Arduino\src/BLEDevice.h:16:...
Benedetta Casadei's user avatar
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17 views

AD8232 Sensor output problem

I'm using the AD8232 ECG sensor with Adafruit ESP32 Feather V2. I'm following this Sparkfun guide https://learn.sparkfun.com/tutorials/ad8232-heart-rate-monitor-hookup-guide/all to use the sensor ...
GiaNguyen Pham's user avatar
-1 votes
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26 views

Question about "noise" on my ESP32 radio [closed]

I have an issue with my ESP32 and VS1053b radio. Everything works fine until I have MP3 stream under 192kbps, if I choose stream with higher bitrate, it will play it, but some noise is in background ...
Smokey's user avatar
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-1 votes
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rc522 'PCD_Authenticate() failed: Timeout in communication.' with any card

I hooked up an RC522 module to my esp32, and uploaded the dumpinfo code to test if it works without modifying anything, just changed the rst and ss pin, and it detects the module, but any card, even ...
Your_missing_bracket's user avatar
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17 views

Send song from phone to esp32 via wired communication [closed]

I want to send an audio (song) from my phone to the ESP32 Dev Kit v1 via wired communication and output this audio output to speakers after some processing through wired communication. Is there a way ...
Shweta Kiran's user avatar
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1 answer
42 views

How can I identify the abilities of my ESP32 module?

I was attempting to discover how to identify my ESP32 development board. I was wondering how to discover the abilities it supports. Here's a snapshot of my board: This was related to a question I ...
raddevus's user avatar
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Why do I need to use ESP32 Wrover for this code to compile? What indicates that so I can know for future?

I have a code sample that is from the following article: Create an ESP32 BLE peripheral for iOS #1 The Code A snippet of it looks like this: (see all code at Github -> https://github.com/robkerr/...
raddevus's user avatar
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Bluetooth Scan ESP32 and match with address without connecting

I want to do a bluetooth scan without connecting and matching the required Bluetooth address to the detected bluetooth addresses. However, I can't seem to get only the address numbers from the ...
Jet's user avatar
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0 answers
45 views

DFPlayer Mini unable to begin

I'm using a ESP32-Wroom-32d Firebeetle V4 board and the DFplayer Mini but I'm unable to get a signal from the DFPlayer to the ESP. I checked every connection with a multimeter and see that the player ...
sha88y's user avatar
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Data constant and always zero from the ADXL345 accelerometer with ESP32 using SPI

I am trying to get data from an ADXL345 accelerometer using an ESP32 via SPI communication. I have configured my code following the ADXL345_WE library specifications and have verified the hardware ...
Revolucion for Monica's user avatar
-1 votes
1 answer
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ModuleNotFoundError: No module named 'serial' when compiling for ESP32 in Arduino IDE [duplicate]

I'm new to ESP32 development and I'm trying to compile a program in the Arduino IDE to record the vibrations by an ADXL345 sensor. However, during compilation, I encounter a "ModuleNotFoundError: ...
Revolucion for Monica's user avatar
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33 views

Issues using both I2C buses on ESP32

I'm using an ESP32 WROOM 32 on a custom board. This board takes three 4-20mA inputs and writes the results onto an LCD. It's set up to have an I2C 20x4 LCD on the I2C0 and an ADC(ADS1115) on I2C1. ...
dave_pp's user avatar
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1 answer
61 views

How to connect two devices via i2c?

I am working with 2 Pololu Altimu-10 V6 connected to the same ESP32 board. Both of them are connected via i2c protocol and have different addresses. The addresses are 0x1C and 0x1E. I have this code ...
sonlas10's user avatar
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How to connect 2 AltIMU-10 v6 via I2C to ESP32?

I am working on a project where I have to use 2 AltIMU-10 v6 and an ESP32 board (compatible with Arduino). To connect both IMUs to the board, I made the next connections: IMU 1: VIN to 3.3V GND to ...
sonlas10's user avatar
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How to completely remove a timer on ESP32

I encountered a problem with a memory leak when creating a timer on ESP 32. In the code I request a timer, and then immediately remove it, between this I display the amount of free memory. It turns ...
daniil's user avatar
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4 votes
3 answers
797 views

74HC595 chip with 7 segment display constantly displays either all 1's or all 0's

I made a simple circuit with an Arduino Nano ESP32, where I have connected a 74HC595 8-bit shift register chip, as well as a 7 segment display with a 100 ohm resistor on common (cathode) to show the ...
Niko's user avatar
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1 vote
0 answers
42 views

Interrupt protection in ESP32 from interference signals

When my ESP32 is powered with an external 5V adapter or 12V power (2596 DC-DC to 5V), and my water meter (reed switch) is connected with the ESP32, the pulse start running wild and keeps increasing at ...
Just doin Gods work's user avatar
1 vote
0 answers
23 views

Weird issue with wire.requestfrom() and MailClient.sendMail() on ESP32- rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

Update_2: No change after Update_1, same error. I still have to comment either email, I2C, or Temperature out, that the other two can work. Update_1: I'm also using a DS18B20 with #include <...
Christian's user avatar
1 vote
1 answer
59 views

Communication between two ESP32, USART vs RS232 with MAX3232

I have two ESP32 that are communicating via USART (TTL) on the Serial2. The TX2 pin of ESP_Alice is connected with the RX2 pin of ESP_bob. The RX2 pin of ESP_Alice is connected with the TX2 pin of ...
Carlo Tavian's user avatar
1 vote
0 answers
44 views

Arduino ESP32-S3 MSC FW+Files

I want both, a Config file on the MSC and also FW Update via USB. Right now I can choose on a Hold Button which should be done. But it shows always two Drives instead of one. One Drive is empty and ...
Ripper121's user avatar
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25 views

Unable to play audio on ESP32 speaker that receives audio from phone via Bluetooth

I have the following code that I am using to receive audio from phone via Bluetooth Classic and sending it to the internal DAC of the ESP32 which is connected to headphones. When I run this code on ...
Shweta Kiran's user avatar
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41 views

Transmitting data wirelessly using HC-12

I'm currently working on a project that involves two stations: a transmitter and a receiver. Please keep in mind that I'm a beginner. On the transmitter side, I'm using an ESP32, HC-12 433MHz module, ...
pepin's user avatar
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IMU (MPU-9256) is not working with ESP32 and Arduino Mega

I have been trying to get roll, pitch and yaw data from my MPU-9265 IMU. After trying multiple libraries and changing hardware like wires and ESP32s I was not even able to get a raw readings from my ...
Ajay Adit J 's user avatar
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44 views

ESP32-C3 - Low Power mode question and suggestion request

I currently have a project I'm working on where I am using the Seeed Studio Xiao ESP32-C3 https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/ https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-...
Mamba343's user avatar
1 vote
1 answer
78 views

More flash memory with SD card

I am pretty sure that everyone have seen the low flash memory error, the same I have got while making my raycaster. So, I was thinking that is there any way to increase the flash memory of ESP32 with ...
Aditya Roy's user avatar
1 vote
2 answers
91 views

GPS Module not catching signal

I am making a gps tracker with neo6m gps module and esp32 dev board. I checked wiring and coding but still my module isn't catching a signal I am already on roof of my house in case it require clear ...
Yug Ahuja's user avatar
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85 views

Can't upload to nano esp32

Recently bought a nano esp32 to play around with the small size and wifi module. However I'm plagued by the No DFU capable USB device available message. My efforts and deductions: I can connect to ...
Nebulous's user avatar
1 vote
2 answers
77 views

Heltec WiFi LoRa 32 (V3) - Encode/decode packets to binary (make message shorter)

I'm using Heltec WiFi LoRa32 boards (ESP32-S3 + SX1262). Could you please help me how to encode data e.g. from temperature and humidity sensor into binary or hexadecimal form - to make the LoRa packet ...
iotdeveloper's user avatar
2 votes
1 answer
202 views

Very slow to connect to WiFi with ESP32 (minutes, not seconds)

I am having some issues with connecting to WiFi with an ESP32 board. It is very sloooooooooow. The first few times I tried, I left it alone for 20 minutes and it still wasn't able to connect. So I ...
Deling Ren's user avatar
0 votes
1 answer
39 views

Can I make this changes to this diagram of a ESP32-CAM?

Have a good day! I am kinda new with electronics circuits, and therefore I got some doubts about this diagram of a ESP32-CAM I want to use a 5V instead of 3.3V. Do i need to add some resistors or ...
Rodrigo Barboza's user avatar
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1 answer
77 views

Interfacing 8 ohm speaker ouput with ESP32

I'm trying to use an ISD1820 recording module with the ESP32, except I want to store the recordings and send them over Wifi rather than playing them back. The ISD1820 has an output for an 8-ohm ...
user89016's user avatar
1 vote
0 answers
38 views

Combining esp_wakeup_timer with external interrupt ext0

I'm working with ESP32-Dev-Kit1 and MMA8452Q accelerometer. I want the ESP to read the accelerometer for 10s, then go to sleep for 10s. If within the sleep period, the accelerometer magnitude reading ...
Lily's user avatar
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1 vote
0 answers
84 views

Why is conversion time 10 times slower in my ESP32-WROOM-32U?

The following code is used to show conversion time and maximum sampling frequency. The code is from this GitHub page for a spectrum analyzer based on the ESP32. The author in his YouTube video shows ...
T R Y's user avatar
  • 75
0 votes
1 answer
77 views

Attempt to change an ESP8266's flashs layout over-the-air

Backstory Several Tasmota devices based on an ESP8285 have to be flashed with alien firmware. The devices' programming ports are not accessible (except for one dummy device which was cracked open for ...
Sim Son's user avatar
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0 answers
164 views

Find MAC address of client connected to ESP32 Bluetooth SPP via esp32-Arduino Bluetooth serial library

Let's suppose I'm using Espressif's Arduino-esp32 Bluetooth Serial library with code similar to the following: #include "BluetoothSerial.h" // snip BluetoothSerial bts; bool firstTime = ...
Bitbang3r's user avatar
  • 543
3 votes
2 answers
128 views

Difficulties acquiring angle values from MPU6050

I'm attempting to acquire angle values from an MPU6050 IMU sensor using an ESP32-DevKitM-1 microcontroller. My setup contains the ESP32 board, the MPU6050 board, and an SD card reader to save the ...
Runsva's user avatar
  • 173
2 votes
1 answer
186 views

ESP32 with static IP address acting as client connecting to ESP32 acting as access point

I have an ESP32 board as a client with a static IP address. The client with the static IP address connects to a second ESP32 that is acting as an access point. The connection is established and the ...
Carlos Costa's user avatar
0 votes
0 answers
58 views

ESP32 Preferences on partition `app1`

My Arduino ESP32 project needs a lot of space for on-device string storage and the default nvs partition is not enough. I'd like to use app1 partition for preferences via pref.begin("ns1", ...
Maxim Kachurovskiy's user avatar
0 votes
1 answer
106 views

AT command validation does not appear on the serial monitor

I can't validate an AT command. Would anyone have any suggestions as to what I might be doing wrong? It should be printing "Sending successful! or "Sending failed!", but it doesn't show ...
Fabio Henrique's user avatar
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0 answers
74 views

Code for ST7789 NO CS pin - Using XIAO ESP32C3

I am trying to get anything out of this screen except for blackness. The CS pin is present based on the coupling or resistors and capacitors on the back of the display. I have tried using the Arduino ...
Reese Houseknecht's user avatar
0 votes
1 answer
87 views

Compressing grayscale image with ESP32-S3-WROOM Freenove

I have a ESP32-S3-WROOM module by Freenove which has a camera and a micro SD card module. I can take a snapshot as a PIXELFORMAT_JPEG photo. However, when I change the pixelformat to "...
BehicMV's user avatar
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0 votes
1 answer
90 views

Problem saving "char" variable to EEPROM on ESP32

I am making a project, in which I need to store the WiFi credentials to the EEPROM. For now, I am able to store a bool array in the EEPROM, but I am not able to store the char variables as the ESP32 ...
Loic Daigle's user avatar
0 votes
1 answer
180 views

HID keyboard: send modifier keys only

I want to send modifier keys like shift, alt, ctrl, etc. without any other key. It should be theoretically possible due to the fact that it works for my normal keyboard (tested it with Xoutput and ...
Join Catman's user avatar
0 votes
2 answers
120 views

Is std::string (and ephemeral memory allocation in general) safe to use for ESP32 Arduino?

I know that with 8-bit AVR Arduinos, std::string is widely regarded as fundamentally unsafe due to problems with heap-fragmentation (partly due to limited ram, and partly because the WAY the ...
Bitbang3r's user avatar
  • 543
1 vote
1 answer
118 views

I can't connect a microSD card

I can’t connect a microSD card to either the Arduino or the ESP32. It needs to be connected to the ESP32; I just tested it on the Arduino to see if it works at all. Equipment: ESP32 devkit v1, Arduino ...
anon's user avatar
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2 votes
1 answer
189 views

ESP32: nRF24L01 receives no data

Using two, nRF24L01 with two, ESP32 DEVKIT V1. Trying to setup RF24 Library example, "Getting Started". Able to transmit on both nodes, however, there is no payload received when switching ...
William's user avatar
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0 votes
2 answers
73 views

Which sketch was this?

With ESP32 being so plentiful here (3 more for Christmas) I am at a loss to determine which sketch I used for a particular unit. Has anyone devised a record keeping scheme or even a serial monitor ...
jansellsbond's user avatar
2 votes
3 answers
250 views

Importing content of text file as string into Arduino code

Is there any macro for importing the content of a file (for example html code) located in the sketch folder as a string for the Arduino IDE during compilation time?
Ali.kavari76's user avatar
1 vote
0 answers
200 views

WiFi.scanNetworks() sometimes triggers wdt reset

In my sketch for ESP32, I call the network scanning function: WiFi.scanNetworks(true); but sometimes it trigger a wdt reset: E (372741) task_wdt: Task watchdog got triggered. The following tasks did ...
Mark's user avatar
  • 393
0 votes
1 answer
156 views

ESPAsyncDNSServer cannot find AsyncUDP anymore

I'm using this ESP32AsyncDNSServer library on my ESP32 application. Suddenly (I'm not sure what I did) it does not compile anymore: .pio/libdeps/Aphrodite/ESPAsyncDNSServer/src/ESPAsyncDNSServer.h:8:...
Mark's user avatar
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