24,983 questions
0
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14
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ESP32 - SIM7000G and TinyGSM response from server stuck/delayed with multipart/form-data POST request
I am experiencing a delay in receiving the HTTP POST request body when sending data over a TCP connection using the TinyGSM library with a SIM7000G and an ESP32 (LilyGo T-SIM7000G).
Below is my ...
- 235
-1
votes
0
answers
23
views
How do you install MAX3232-based RS232↔TTL converter? [closed]
I’m trying to use a MAX3232-based RS232↔TTL converter module (see image below). Unlike common MAX485 modules or other MAX3232 variants, this one doesn’t have through-holes on the ← and → TTL pads. The ...
- 99
0
votes
0
answers
13
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WeMos connection to SinricPro
I am using a WeMos Wifi ESP8266 with a DHT11 sensor to measure temperature and humidity in my house and send them to SinricPro. Alexa then reads from here and uses them to answer to the question "...
- 109
0
votes
0
answers
18
views
Elegoo Uno R3 not showing up in dmesg or /dev/tty [closed]
I'm trying to learn how to write raw AVR C for the Arduino. I'm currently using the Ubuntu WSL on Windows to do this. However, I don't think my computer is recognizing the device. When I run
dmesg -w
...
- 1
-1
votes
0
answers
22
views
library recommendations for data encryption, [closed]
Does anyone have any library recommendations for data encryption, especially Ascon and AES cryptography?
1
vote
0
answers
47
views
Arduino libraries in Atmel Studio, importing INO and building core for DUE
Is there a simple way to use the Arduino libraries in Atmel Studio 6 or 7? Already tried it with include path but thats a never-ending story. Looking for a precompiled .a file for the Arduino Due so I ...
- 11
0
votes
0
answers
25
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Sustain input current on the RTC pin of Arduino R4 WiFi [closed]
I need to use my Arduino R4 WiFi from time to time as a data logger, and of course I need to access the curent date and time.
So I'm wondering about the battery I need to connect to the dedicated RTC ...
- 27
-1
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0
answers
17
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Arduino can't see any library I have installed for nrf24l01? [closed]
Compilation error: nRF24L01.h: No such file or directory
0
votes
1
answer
20
views
Receiving data on ESP32-Cam from Raspberry PI
My use case is an esp32-cam that serves two purposes:
HTTP feed (accessed by a Raspberry Pi 5 which processes stream and provides a response)
Servo Motor microcontroller: Receives response from ...
- 51
0
votes
2
answers
50
views
How do I read data from a 32 bit I2C register address?
I'm having trouble reading the I2C data from the CPS8200, that has a 32 bit Register Address. Since I'm not too familiar with I2C register addresses more than 8 bits, and right now I'm not sure if I'm ...
- 109
-2
votes
0
answers
12
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sending data from nodemcu to google sheet? [closed]
I need a simple script for google sheet to read integer data from node mcu and code for node mcu to send data to google sheet along with date and Time
0
votes
0
answers
44
views
Maximum servo issue in quadruped spider robot [closed]
I have been buidling a quadruped spider robot with nrf24l01 module as transciever. In addition to it, I wanted to attach another servo (13th one) for a turret mechanism so that I can shoot out bullets....
- 39
0
votes
1
answer
31
views
Compiling issues with included library MX1508 for Billy Bass build
Thank you for considering my question.
I have been learning Arduino so I can teach coding basics to my son. I came across a fun project to interface bluetooth with an old singing Billy Bass so he can ...
1
vote
1
answer
256
views
How to implement a pulse counter for two clocks on Nano Every?
For clock synchronization I want to implement a pulse counter on the Arduino Nano Every. There are two clock signals at 40-100 kHz, the Nano runs on 20 MHz. Nyquist says we need at least 2 times the ...
- 111
-1
votes
0
answers
37
views
What microcontroller should I use for my project? [closed]
I recently received a box of random hardware modules as a present and recently decided to make a joystick for flight simulators with the included potentiameter joystick (2 axis four pin) and button. I ...
- 9
-2
votes
0
answers
39
views
Control issue Self Balancing Robot
I have been building a self balancing robot with my daughter, but I have become stuck when I connect to the bluetooth via my Android.
I can connect to the bluetooth but I do not have any control.
I'm ...
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1
vote
1
answer
47
views
Generate all frequencies between 5 and 8 kHz in steps of 1Hz
Is it possible generate all frequencies between 5000 and 8000Hz, 1Hz in between with an ATmega328?
When I create a c-program outside the Arduino IDE to calculate the frequencies with the formula ...
- 131
0
votes
1
answer
64
views
New Freak UI @Arduino IDE v2.3.6 - 2025/05/21
This shXt stop after I turn off the power, and bring Notebook back to home. @@"?
No any configuratin changed, just power NB off and on.
How this shXt happened, and how it solved !? No idea...
...
- 11
0
votes
1
answer
51
views
Stepper motor not moving
this is my second Arduino project and I am trying to figure out why my stepper motor is not moving. I was able to get a basic 28byj-48 stepper motor to work using stepper.h and some sample code.
Now I ...
- 109
0
votes
1
answer
39
views
I've looked at the spec sheet on the ESP8266, but can't find the time it takes for the A/D conversion or the A/D control registers
text or link to describe the answer or a link to where to find the answer. I am a newbie to the esp8266.
1
vote
0
answers
32
views
Can't get ESP32C6 to work in PlatformIO. Error is "unsupported ISA substring '_zicsr_zifencei'"
I bought a few Waveshare ESP32C6 Touch LCD 1.47 boards and have had a hell of a time trying to get my sketch uploaded. I somewhat understand that PIO doesn't support esp32c6 because:
The ESP32 Core ...
- 11
0
votes
0
answers
26
views
Circuit Playground Express (CPX) + Crickit + I2C sensors
I have a Circuit Playground Express (CPX) mounted on a Crickit. I want to control two air pumps using the motor output on the Crickit, but also connect two Adafruit SCD41 sensors using I2C.
When I ...
- 9
-3
votes
0
answers
29
views
Arduino R4 WiFi Debugger Hardware or Software
new user on the Arduino R4 WiFi I'm testing important tools such as the Debugger which is hardware based by using the on board ESP32.
I understood that I have to configure the "system" with ...
- 27
0
votes
2
answers
73
views
LED Matrix for Arduino R4 Wi-Fi specific functions
I'm searching for the path and the source code for the builtin (I think) function, name is: renderBitmap().
This function appears as a member of the ArduinoLEDMatrix class but its name doesn't appear ...
- 27
-1
votes
0
answers
45
views
Task switching does not work when holding down a button in a program built in CoIDE [closed]
This program builds in CoIDE. Task switching does not work. When holding down the button, the task should switch, that is, 3 LEDs were lit first (when pressed, they turned off and turned on again). ...
- 1
-1
votes
1
answer
54
views
Reasons for an ATmega328P Nano SuperMini USB-C board not being recognized by a PC/Mac? [closed]
I recently got two of these ATmega328P Nano SuperMini USB-C boards but none of them is being recognized by my PC or Mac.
I'm using the old bootloader setting in the Arduino IDE 2.3.6, CH340 drivers ...
- 75
0
votes
1
answer
32
views
How do I reinstall Arduino IDE 1.8.12 to correct corruption, without losing all of my libraries and board installations?
I have been told to reinstall my Arduino IDE Ver: 1.8.12 to correct some corruption with my current installation.
loading hardware from C:\Users\Paul\AppData\Local\Arduino15\packages: loading package ...
- 21
1
vote
1
answer
53
views
Arduino Nano ADC input selection
The maximum ADC sample rate for the '328p, using the default prescaler of 128, is given as roughly 10000 samples per second. Maybe I've missed it, but I can't see whether that is the total rate for ...
- 269
1
vote
0
answers
29
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ESP32 and Fingerprint Sensor – Serial Monitor Shows Nothing
I'm trying to connect a fingerprint sensor (Adafruit type) to my ESP32 (DOIT ESP32 Devkit V1), but the Serial Monitor remains completely blank, even though I'm using Serial.begin(9600) and printing ...
- 11
0
votes
0
answers
31
views
How to get relative orientation from MPU6050 without a fixed "up" direction (wand project)?
I'm working on a project using an MPU6050 connected to an ESP32 DevKit V1. The idea is to use it inside a wand, where the user can freely rotate it in their hand — meaning the wand has no fixed "...
1
vote
1
answer
41
views
When I run my for loop the serial monitor is giving very strange results
This is unfinished code for driving a 4 digit 7 segment display. When I run my data function that should output the data to send to the shift register, I get a very weird output.
0 00111111
1 00111111
...
0
votes
2
answers
61
views
How does a sensor data move from physical layer to application layer
I have used Arduino IDE to program a IOT gateway using ESP32 and W5500 ethernet module to use them as a ethernet webserver.
I wanted to know for educational purpose, I know that sensor belong to ...
- 19
1
vote
0
answers
35
views
Configuring the colors of the IDE
I do not like the dark theme at all and I set the Light theme, but the output background color is still black. I know that somewhere there is a file where it is possible to tweak the colors, but I ...
- 11
0
votes
0
answers
49
views
"Why am I getting 'Failed to read from DHT sensor' with my DHT11 on Arduino?"
I am using an Arduino Uno and a DHT11 sensor (mounted on a small blue module with 3 pins) for measuring temperature and humidity. However, I'm getting the error message "Failed to read from DHT ...
0
votes
0
answers
38
views
How to wire a 9v power supply to an LED matrix and power Arduino Uno?
So I've been looking for some advice but I can never find a good answer. My current project requires me to externally power a btf lighting 22*22 matrix to an external power supply. I bought one from ...
- 1
2
votes
1
answer
108
views
ESP32 LED PWM fade not working?
Not sure if this belongs more in an electronics SE, but I'll give this a try.
I'm trying to use an ESP32-C3 and an NPN transistor (2N5551) to PWM drive an LED (values below). I'm trying a simple fade, ...
- 149
1
vote
0
answers
28
views
arduino micro A000053 disappear at device manger
I have two Arduino micro atmega32u4 boards (A000053)
and I'm trying to detect them with at Device manger but I'm stuck,
I tried to solve it with the guide below but not succeed because the device ...
- 11
0
votes
2
answers
78
views
Coding Sequential Operations
I am using an Arduino r4 Wi-Fi to control unique angle settings for two different servo motors during the execution and operation of a device I am building.
I want to have the servos use different ...
0
votes
1
answer
72
views
Serialise a struct containing a flexible array
I want to serialise and deserialise a struct containing a flexible array.
I did find a working code but wondering if it is the most elegant and optimum way to do it.
This is my first attempt below ...
- 135
1
vote
1
answer
50
views
Connect ESP32-CAM to L293D
Disclaimer: I'm a programmer, not an electronics expert. I built this car using an Arduino Uno, and now I want to add a camera to it. I’ve tried researching online, but I couldn’t find much ...
- 11
1
vote
2
answers
61
views
Trouble calibrating MMC5603 Magnetometer with MotionCal and Adafruit SensorLab – readings seem off
I'm trying to calibrate my MMC5603 magnetometer using MotionCal and the Adafruit SensorLab Jupyter notebook, but my readings seem off. The raw magnetometer values appear to be spread out oddly even ...
user118038
1
vote
2
answers
55
views
Can't sync ESP32 with Blynk
I was trying to display the readings of my dht11 sensor on the Blynk dashboard but I am struggling a lot. A little help would be really appreciated.
#define BLYNK_PRINT Serial
/* Fill in information ...
- 111
1
vote
2
answers
133
views
ESPAsyncWebServer WiFi.scanNetworks() Soft WDT reset
I'm using Arduino IDE(2.3.5) ESP8266 (3.1.2) and ESPAsyncWebServer (3.7.4), ESPAsyncTCP(2.0.0). I need to wifi scan the network an print the result of my web interface. If I use WiFiScanNetworks(), ...
- 11
1
vote
1
answer
67
views
ESP32 scanNetworks compile error: call of overloaded 'BSSID(int)' is ambiguous
I am trying to run following code:
#include <WiFi.h>
void setup() {
//int16_t scanNetworks(bool async = false, bool show_hidden = false, bool passive = false, uint32_t max_ms_per_chan = 300,...
- 19
0
votes
1
answer
32
views
Problem Parsing NWS Severe Weather Alert API using Arduino_JSON.h [closed]
I have been using Open Weather and Weather Undground APIs for some time. I recently learned the National Weather Service has an API for alerts. I can print out the raw data but not able to parse it. ...
- 11
1
vote
2
answers
67
views
Unwanted toggle on OC1A
the code below for the ATmega328P (Arduino Pro Mini 5V @ 16 MHz) produces a periodic sequence on timer1 pins OC1A and OC1B:
#include "Arduino.h"
// For Arduino Pro Mini 5V @ 16 MHz
// ...
0
votes
4
answers
108
views
Adding multiple or's in line to condense amount of if lines
I have edited my question for more clarity. I am including the whole sketch. I tried to do a shorter version of my sketch, for this question, which had some typos in it and the way it was wouldn't ...
-1
votes
1
answer
79
views
MFRC522 RFID RC522 Only Works Sometimes – Unreliable Detection Issue
Problem Overview
I’m using an MFRC522 RFID module with an Arduino Uno, and it only detects RFID tags sometimes. The behavior is inconsistent—sometimes it reads the card instantly, and other times, it ...
- 1
3
votes
1
answer
217
views
How to send 0x1A as data via TCP on SIM8xx?
I am using a SIM868 module with an Arduino Mega, where the SIM868 is connected to Serial1.
After establishing a TCP connection, I need to send the following byte stream:
{0x60, 0x1A, 0x9D, 0x01, 0x00, ...
- 39
-1
votes
2
answers
64
views
How can you trace out the short-term trajectory of a 6DOF IMU
I've looked and looked on forums, wrote prompt after prompt in DeepSeek and ChatGPT but I've hit a roadblock.
I'm currently working on a project where I want to write numbers in the air using a ...
- 7