Newest Questions
24,986 questions
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Reading JSON from Arduino via Serial Missing Parts of Message
I have a project (Digital Dashboard for a Motorhome) in Pi that reads JSON data from an Arduino board and sends it via Serial.
The Pi gets the JSON data, makes some adjustments and then sends it to an ...
0
votes
1
answer
15
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Replace bootloader in ATTiny88
There are other threads about replacing the bootloader on Arduino boards, but the ATTiny88 seems to be rather a different beast. Instead of creating a serial port and sending the compiled code to the ...
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0
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21
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How to faithfully collect geophone data by modbus RTU
I am trying to collect data from a geophone using a UNO R4 minima as slave with a Zihatec shield so that I can integrate it into a larger project on a modbus RTU bus. The signal from the geophone is ...
- 101
2
votes
2
answers
1k
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I need compact code to fit in memory
I feel a little like I am back in 1975 trying to fit my code in 4K of RAM.
I am writing some code for an ATTiny88, and the code is starting to get big, relatively speaking. I need to save every byte ...
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0
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21
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How do I generate a square wave with an Arduino Uno and DDS 9850 module? [duplicate]
I am having difficulty generating a square wave using an Arduino Uno and an AD9850 frequency generator. From what I understand the ZOUT pin should generate a square wave at the same frequency that the ...
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38
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Send DTMF tones with arduino [closed]
I have been searching for a way to automatically answer calls and send DTMF tones, as many apartments in my area use intercoms with local rj11 phones. How it works is it calls the assigned phone in ...
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0
answers
62
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Arduino simulator [closed]
What Arduino simulator program do you recommend for simulating a toy car (ideally, opensource)? (I'm new to Arduino.) I previously tried ThinkedCAD, but it seems to only work with basic circuits (I/Os,...
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19
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avrdude: stk500v2_getsync(): timeout communicating with programmer Failed uploading: uploading error: exit status 1 [duplicate]
i bought chinese arduino mega 2560 and have this error
avrdude: stk500v2_getsync(): timeout communicating with programmer Failed uploading: uploading error: exit status 1
led on L is blinking when i ...
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0
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1
answer
44
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Arduino HardwareSerial flow control with handshake XON/XOFF
I am sending large texts from PC to Arduino over Serial and I cannot simply copy-paste it, as Arduino is not fast enough to process it on the fly.
I need some flow control (probabely XON/XOFF) so ...
- 1,466
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50
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ESP32-S3 continuous reboot after flashing larger firmware
I’m facing a persistent reboot issue on one of my ESP32-S3 boards after flashing a larger firmware binary. Here’s a breakdown of the problem:
🔧 What’s Happening
After flashing my project (which ...
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1
answer
56
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How can I improve ELM327 response stability on Arduino after setup verified with OBD-II scanner guide?
I'm using an Arduino Mega with a Bluetooth ELM327 adapter to read live data from my car’s OBD-II port — specifically RPM (PID 010C). The goal is to log data to an SD card or display it in real time.
...
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1
vote
1
answer
58
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How does `delay()` differ from using `millis()` in terms of processor efficiency and responsiveness?
In many Arduino sketches, especially beginner ones, delay() is commonly used to pause between actions. However, I’ve seen more advanced projects use millis() instead to handle timing.
From a ...
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0
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36
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Problem generating 10kHZ sine wave using Arduino Uno R3 + DDS AD9850 -- distorted output on oscilloscope
I am attempting to generate a 10kHZ sine wave using an Arduino Uno R3 and a DDS AD9850 wave generator module and getting jagged higher frequency signals in the Megahertz instead.
I have successfully ...
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1
answer
20
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How can I achieve <50 ppm timing with a Sparkfun Artemis ATP?
I want to sample an ADC at very regular intervals. Right now, using millis/micros (which are driven by the internal RC oscillator), I'm off by around 3000 ppm, and it drifts.
Here are some things that ...
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1
vote
1
answer
55
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MKR1010 Interference when relay motor engages?
I am a complete beginner. Are Arduino products really flaky?
I've thrown together the circuit in the diagram - an MKR1010 in a relay shield. I've wired up 2 sets of sensors, an LCD screen and a motor. ...
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32
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Arduino R4 webpage not loading
I am trying to create a web page through which I can control the builtin LED of Arduino R4 wifi. I thought since this is basically an ESP32, I could run it but, even though I'm getting the IP address ...
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1
answer
44
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Is there a way to use symbolic names for debug watch of RISC-V registers?
Re debugging RISC-V CH32V2xx/CH32V3xx
Is there a way to watch 'RCC_CFGR0', say, rather than '* 0x40021004'?
eg. add definitions to GDB?
(program compiled with -g option and optimized for debug, IDE 2....
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votes
1
answer
91
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Error in Compiling for Seeed Xiao nRF52840 [closed]
I am using Arduino IDE 2.3.4 to program a XIAO nRF52840 Sense. I added the board using the instructions on the official getting started page.
After installing the board in Arduino IDE, I open up the ...
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1
vote
1
answer
85
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include directive for external libraries
I added the Adafruit_GFX_Library to my Windows.
I used Arduino IDE, Tools > Manage Libraries > Install.
In preferences, Sketchbook location is set to d:\Alex\Hobbies\Electronic\Learning Arduino\...
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61
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How to setup the configuration (User_Setup) of TFT_eSPI for ILI9225 176x220 TFT with esp32?
I was trying to interface my 2 inch 176x220 reslolution tft display having a ILI9225 driver with esp32 using TFT_eSPI library.This is the User_Setup file of the TFT_eSPI library, i edited this to ...
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0
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40
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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 ...
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0
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29
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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 "...
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2
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0
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74
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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 ...
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1
answer
36
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How to receive data from an Rasberry Pi on ESP32-Cam?
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 ...
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0
votes
2
answers
62
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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
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1
answer
42
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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
275
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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 ...
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1
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52
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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 ...
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1
answer
69
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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...
...
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0
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1
answer
64
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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 ...
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1
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41
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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.
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0
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44
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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 ...
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0
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29
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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 ...
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2
answers
84
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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 ...
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1
answer
59
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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 ...
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1
answer
34
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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 ...
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1
vote
1
answer
56
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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 ...
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1
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1
answer
52
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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 ...
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42
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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
...
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2
answers
77
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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 ...
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0
answers
41
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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 ...
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2
votes
1
answer
124
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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, ...
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0
answers
30
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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 ...
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2
answers
82
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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 ...
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1
answer
75
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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 ...
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1
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1
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53
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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 ...
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1
vote
2
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68
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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
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vote
2
answers
66
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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 ...
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2
answers
144
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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(), ...
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1
vote
1
answer
70
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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,...
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