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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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How to detect water presence with only 2 wires

I don't know if this question belong here or on electronics SE. A manufacturer just sent me a personalize device which include an ESP-32 and a Water Sensor. My problem is that I don't know how to ...
Gazouu's user avatar
  • 273
1 vote
2 answers
2k views

Creating a Web Interface for ESP32 [closed]

I am working on a project that involves moving various servos and lights and I need a good UI to work with the device. I've previously used Blynk, which worked very well but I didn't like some of the ...
Zachary Allen's user avatar
0 votes
1 answer
714 views

Connect a TM1627 to ESP32

I want to control a 7 segment display that has a TM1637 integrated with an ESP32. Some time ago I created a layout that used an ESP12e but I need more GPIO pins so I'm switching over to an ESP32. ...
Tvde1's user avatar
  • 111
-1 votes
1 answer
2k views

Unable to upload to ESP32 LOLIN D32 board

I'm not able to upload a sketch to this board with the Arduino IDE. This is the error during upload: Arduino: 1.8.5 (Windows 10), Board: "WEMOS LOLIN32, 80MHz, Default, 512000 Build options changed, ...
Karanbir's user avatar
8 votes
2 answers
27k views

How to choose alternate I2C pins on ESP32?

I'm a begginer with Arduino and this may be a basic question but I'm facing an issue. I'm using a HTU21D sensor with an ESP32. This sensor use I2C communication. Inside the Arduino library, there is ...
Gazouu's user avatar
  • 273
4 votes
1 answer
9k views

ESP32 AP max connections: 4 or 10?

I am using the SoftAP feature of the ESP to create a central node, and connecting five or six clients in the final application. However, I don't know if i can connect that many clients. One of the ...
CharlieHanson's user avatar
0 votes
1 answer
76 views

Arduino Wifi Works one way but not the other? (ESP32) (Possible Variable Type Problem)

I am working on a code that accepts input from serial monitor and connects to Wifi, and have been getting issues. my SSID for my wifi is "SamF" but for some reason arduino only likes it when I ...
AceSammy's user avatar
1 vote
0 answers
179 views

Waveshare Display on ESP32 has weird graphic glitches

I am trying to pass an image to the display through the GxEPD module. I tested the display and its working fine with an example sketch. I am using a WEMOS LOLIN32 and a 7,5" B/W Waveshare display. ...
Flying Thunder's user avatar
1 vote
1 answer
3k views

Increase sample rate in ESP32 board

For my final project on the university as a Systems Engineer, I'm working on a "electronic stethoscope", which is giving me a lot of headaches. I bought a Adafruit Feather ESP32 Huzzah (https://learn....
Mauro Bilotti's user avatar
1 vote
0 answers
627 views

DS18B20 flaky with LOLIN32 ESP32 board, rock-solid with Uno

I'm trying to read 4 DS18B20 sensor probes (https://amazon.com/gp/product/B00Q9YBIJI and https://amazon.com/gp/product/B008HODWBU) with a "Wemos" LOLIN32 ESP-32 board (https://amazon.com/gp/product/...
Bitbang3r's user avatar
  • 543
0 votes
1 answer
75 views

General confusion about how to start

I want to test around with my ESP32 and an E-Paper display - yet i am stuck at uploading sketches via Arduino IDE. I get those kind of errors: avrdude: stk500_getsync() attempt 1 of 10: not in sync: ...
Flying Thunder's user avatar
4 votes
1 answer
20k views

How do you convert a formatted print statement into a string variable?

I'm using the following routine to print the current time on the com port. I would like to capture this as a string so I can display it using ePaper. void printLocalTime() { time_t ...
Simon Markham's user avatar
0 votes
1 answer
3k views

Wiring parallel TFT with ESP32

I have this Parallel LCD TFT. I want to connect it with an ESP32 (NodeMCU). I am using the TFT_eSPI library. In the TFT_eSPI documentation, it says that the connection should be as following: // The ...
Humam Helfawi's user avatar
1 vote
0 answers
132 views

Is there a equivalent to #define DEBUG 0 declare by VS2017 with VisualMicro (arduino) project?

Especially on ESP32*/8266, when you select debug (debug/release) : as a target, VisualMicro detect it and start the simple debugger (without JTAG). Do you know if when target is debug, is there a #...
E.Racineux's user avatar
1 vote
2 answers
186 views

Merge two Arduino projects (change build process)

I'm working on a big software project consisting of several Arduino sketches. I have one Arduino project providing general functionality, such as TCP/IP communication, parsing queries, handling errors,...
Sim Son's user avatar
  • 1,869
3 votes
1 answer
4k views

What is the tool to send file to SPIFSS on ESP8266/32?

Is there good tools (IDE, CLI or IDE addon) to send file via USB port to SPIFSS internal espressif ESP hardware SoC ?
E.Racineux's user avatar
0 votes
1 answer
2k views

How to compile Arduino ESP8266/32 on CI/CD (CLI shell cmd) platform?

Like make for not ESP Arduino target, is there a CLI command like esptool.py to upload in the hardware ? I've seen makeEspArduino but seems to be not trivial ? What about espressif ESP32 component ? ...
E.Racineux's user avatar
4 votes
2 answers
11k views

Is there alternative to arduino IDE program ESP8266 and ESP32 with arduino toolchain? [closed]

I use ESP8266 and ESP32 with arduino toolchain rather than pure arduino hardware. Arduino IDE is standard and proven but what are the other IDE and advantage/disadvantage ?
E.Racineux's user avatar
1 vote
0 answers
256 views

256 (8x32) LED Matrix via ESP32-Pico-Kit_V4 possible? (Daft Punk Helmet)

I am currently planning on a Daft Punk Helmet. But the available kits are terribly expensive. I am looking forward to using a 8x32 LED-Matrix(with 256 separate 5mm LEDs) and having a few different ...
Xenox's user avatar
  • 123
2 votes
0 answers
3k views

5V Pressure sensor module with 3.3V ADC

I'm using ESP32 to read analogue pressure readings from this pressure transducer. My Problem is this sensor outputs 0.5V – 4.5V linear voltage output based on the pressure but ESP32 can only handle 0 -...
Prasad De Zoysa's user avatar
1 vote
0 answers
649 views

Arduino Pro Mini (5v) I2C pullups

I recently bought an ESP-WROOM-32 module and I want it to talk to my Pro Mini via I2C. Do I have to pull-up the lines to the 3.3v side (ESP32)? Since the Pro Mini runs at 5v, I think it's a bad idea ...
JFetz2191's user avatar
  • 155
3 votes
0 answers
1k views

NPN transistors level shifter [closed]

I'm going to use this for Arduino Pro Mini (5v version) to communicate with ESP32 via UART so I need level shifting. I found this circuit which uses NPN transistor and I'm also going to use it. This ...
JFetz2191's user avatar
  • 155
1 vote
1 answer
2k views

remove weird chars from char array ESP32

When I'm converting a string to a char array there are always some weird chars at the end. I have to do it manualy because the convertTochar function crashes my ESP. String sssid = module.getCssid()...
rusky's user avatar
  • 13
0 votes
1 answer
1k views

Strange discrete errors when reading HC-SR04 sonar sensor

I'm experimenting with an HC-SR04 sonar sensor. Basically I'm measuring the distance to a cardboard box twice a second with these lines of code running on an ESP32: unsigned long sonarMeasure() { ...
Falko's user avatar
  • 103
1 vote
1 answer
6k views

Synching local clock usign NTP to milliseconds

I am interested in getting a local clock on an ESP32 module synch to a network clock using NTP. I am able to read data and time here. But I am interested in synching to the milli second level. #...
Venkat 's user avatar
-1 votes
1 answer
2k views

Using SD library in a ESP-IDF project on ESP32 [closed]

I just started to move from the Arduino firmware to the esp-idf firmware. I read that link. I learn that I have to include libraries creating a component files, with a component.mk file, *.c, *.cpp ...
BuzzRage's user avatar
1 vote
0 answers
1k views

Adafruit ESP32 device working on OSX 10.13 but not on OSX 10.11 on older machine

I'm new to Arduino - just got an ESP32-based Adafruit Feather HUZZAH32. I got it up and running on my Macbook Air (High Sierra) with no problem, following the instructions at this page linked from the ...
RustyShackleford's user avatar
2 votes
2 answers
2k views

Is it possible to increase the voltage on 3.3v output to 5v on an ESP board to power a DC motor? [closed]

I am trying to use an ESP32s controller connected to an RC car DC motor. I found that when using my Arduino this is easily accomplished, and I can see that my output pin produces 5v for the motor to ...
Rif's user avatar
  • 43
0 votes
1 answer
532 views

Low-power detect rise and fall of input signal

For a very low-power-project (where I want to keep the micro-controller asleep or powerless as much as possible), I need to detect the rising and the falling of an input-signal (which could power-on ...
robert's user avatar
  • 3
2 votes
0 answers
927 views

Use ESP32 as a secure socket

I have a board without network connection, then I bought an SP-WROOM-32 dev kit because it has network connection ability. Is there any way that I use esp32 as a secure socket (just like calling ...
Rain's user avatar
  • 21
2 votes
3 answers
2k views

Calling I2C functions inside an ISR

I have an Adafruit 2.8" cap touch display, which has an interrupt pin (IRQ). I tried to use this with my Arduino Nano, but encountered a problem: When trying to get the touched point from the display ...
Lehue's user avatar
  • 193
1 vote
1 answer
8k views

How to pass JsonObject from ArduinoJson to ESP8266WebServer object?

I am learning the ArduinoJson.h library and creating jsonOject: JsonObject& prepareResponse(JsonBuffer& jsonBuffer) { JsonObject& root = jsonBuffer.createObject(); JsonArray& ...
Ciasto piekarz's user avatar
2 votes
3 answers
2k views

Esp32 Https Problem

I am working on a project in which i have to send GET request to my Company's Https server. I have successfully sent the GET request using NodeMCU v 1.0 (ESP 12E). The NodeMCU 1.0 (ESP 12E) Arduino ...
paras bhanot's user avatar
2 votes
1 answer
3k views

How to receive and process a long string sent over serial?

I want to receive about 5kb of data in Base64 format. The following code does not work. Only a few characters are received, sometimes CPU crashes. String content = ""; char character; while (Serial....
ZiomekPoziomek's user avatar
1 vote
2 answers
6k views

Duplicate libraries while compiling for ESP32 in the Arduino IDE

I have just added the ESP32 toolchain to the Arduino IDE (v1.8.0) on Windows 10. To get the IDE to allow me to select ESP32 chips I had to place the Espressif folder in "D:\Program Files(x86)\Arduino\...
Code Gorilla's user avatar
  • 5,637
0 votes
1 answer
8k views

Using all ten capacitive touch inputs on the ESP32

I am using a Wemos Pro ESP32 development board and would like to be able to use all ten of the available capacitive touch inputs. I am able to get readings from nine of them but not T1. Here is the ...
juliusbangert's user avatar
-1 votes
1 answer
3k views

Video streaming by ESP32 [closed]

I'm making an Arduino car and controlling it with a game-pad by bluetooth. I want to have a live video from it by using ESP32 board and ov7670 camera or vc0706 camera. How can I do this ??
MGTM's user avatar
  • 13
-2 votes
1 answer
2k views

ESP32 wifi module [closed]

I want to connect my arduino uno rev3 to wifi. The best option I found was esp8266. After searching about it I found that it is succeeded by esp32. But I am not able to find much information about it. ...
Ayush Singh's user avatar
3 votes
0 answers
9k views

How do I interpret the esp8266 "boot mode" message?

Everytime the chips resets, we get the reason and the next boot mode. ets Jan 8 2013,rst cause:XXX, boot mode:(YYY,ZZZ) For XXX we can check the meaning here. For YYY and ZZZ I am not sure but I ...
nemewsys's user avatar
  • 215
1 vote
2 answers
5k views

WiFiClient::connected() not working

I use an ESP32 to open an access point and listen for TCP connections over a WiFiServer object. When I get a client on the server I want to know when it has disconnected. Currently I have a simple ...
schacker22's user avatar
2 votes
1 answer
15k views

ESP32 in Arduino-IDE with FS.h and SPIFFS

I'm working on a webserver on ESP32 in Arduino IDE and would like to load an html-file. Tried to use SPIFFS.open from the library FS.h from github. Errormessage says SPIFFS was not declared in this ...
carousally's user avatar
0 votes
1 answer
4k views

ST7735 display with esp32

I have edited the adafruit ST7735 library so that it supports esp-32.I made some edits in Adafruit_ST7735.h file. which are as follows. The code works fine but I had expected the screen to work ...
Harsh Chittora's user avatar

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