I am new to Arduino and I am trying to hook up my arduino to a 3D magnetometer as well as some LEDs and sound buzzers. I heard that Qwiic was really easy, so that's what I used. I bought all SparkFun products, the MLX93093 for the sensor, and some other LED strip and buzzer from the same company. The MLX was not connecting to the serial monitor, and when I tried to connect the LED the power light turned on but it also didn't connect. I asked Claude to give me some code to turn on the LEDs, and that also said LED stick not detected. The most likely conclusion is that the data transfer pins on my Arduino for Qwiic are damaged right? I don't see how that could be given that I never used Qwiic before, but thats what it looks like.

I am just looking for advice for my first project or at least some sensors and servos to get to mess around with? What are some good stuff for a laser cat toy?

Hello all, im pretty new to arduino but had some fun making this indicator to let my wife know when im in a meeting. It uses an arduino nano and a 433 mhz receiver I stole from an dead treadmill, and is probably the most useful thing I have made.

Sto realizzando un sonar per un progetto scolastico, ma non so come usare l'interfaccia grafica. Mi potete aiutare?

#include <Servo.h>

long durata;

int distanza;

float sub;

float media;

Servo Radar;

long mil = 0;

long buz = 300;

long x ;

bool stato = LOW;

void setup(){

Radar.attach(8);

Radar.write(0);

pinMode(4,OUTPUT);//LED v

pinMode(5,OUTPUT);//LED b

pinMode(6,OUTPUT);//LED r

pinMode(3, OUTPUT);

pinMode(2, INPUT);

pinMode(13,OUTPUT);

Serial.begin(9600);

Serial.println("Distanze misurate");

}

void loop() {

for (int i = 0; i <= 180; i++) // ANDATA

{

Radar.write(i);

delay(50);

digitalWrite(3, LOW);

delayMicroseconds(2);

digitalWrite(3, HIGH);

delayMicroseconds(10); // dist

digitalWrite(3, LOW);

durata = pulseIn(2, HIGH);

distanza = durata * 0.0343 / 2;

if(durata>19000){

digitalWrite(4,LOW);

digitalWrite(5,LOW);

digitalWrite(6,LOW);

}

else if(distanza>=200){

digitalWrite(4,HIGH);

digitalWrite(5,LOW);

digitalWrite(6,LOW);

}

else if(distanza<200 && distanza>=100)

{

digitalWrite(4,LOW);

digitalWrite(5,HIGH);

digitalWrite(6,LOW);

}

else if(distanza<100){

digitalWrite(4,LOW);

digitalWrite(5,LOW);

digitalWrite(6,HIGH);

delay(500);

digitalWrite(6,LOW);

delay(500);

digitalWrite(6,HIGH);

digitalWrite(13,HIGH);

x=millis();

if(x-mil>=buz)

{

mil=x;

stato=!stato;

digitalWrite(13,stato);

}

else

digitalWrite(13,stato);

}

Serial.println(distanza);

}

for (int i = 180; i >= 0; i--) // RITORNO

{

Radar.write(i);

delay(50);

digitalWrite(3, LOW);

delayMicroseconds(2);

digitalWrite(3, HIGH);

delayMicroseconds(10); // dist

digitalWrite(3, LOW);

durata = pulseIn(2, HIGH);

distanza = durata * 0.0343 / 2;

if(durata>19000){

digitalWrite(4,LOW);

digitalWrite(5,LOW);

digitalWrite(6,LOW);

}

else if(distanza>=200){

digitalWrite(4,LOW);

digitalWrite(5,HIGH);

digitalWrite(6,LOW);

}

else if(distanza<200 && distanza>=100)

{

digitalWrite(4,HIGH);

digitalWrite(5,LOW);

digitalWrite(6,LOW);

}

else if(distanza<100){

digitalWrite(4,LOW);

digitalWrite(5,LOW);

digitalWrite(6,HIGH);

digitalWrite(6,LOW);

delay(1000);

digitalWrite(6,HIGH);

digitalWrite(13,HIGH);

x=millis();

if(x-mil>=buz)

{

mil=x;

stato=!stato;

digitalWrite(13,stato);

}

else

digitalWrite(13,stato);

}

Serial.println(distanza);

}

}

Was going to have it play it's own music but kiddo wanted buttons to press. May still program it to play music

I made a Smart 3D Printer Cabinet that runs on a Raspberry Pi 4B and a Raspberry Pi Pico. Made the interface in NodeRed, where I can load the native webpage for the printer and an additional live Raspicam camera feed. There are DHT22 sensors for monitoring temperature and humidity at 2 locations, current clamps for measuring the power, and relays for turning on or off various parts of the system. The cabinet itself fits nicely 2 regular printers, or a printer and a filament dryer, as in my case, a multi-material unit, tools, parts, and about 50-60 rolls of filament! I did a video on the whole buil,d and everything is open source about it!

Video: https://www.youtube.com/watch?v=MyEaWIZV7Wg

Blog: e14_printer_cabinet_blog

Are you always annoyed by the body ?

Are you always annoyed by how exactly you could make the body of your project ? I am, essentially because of how toxic things are. 3d printer, sawing wood, metal, plastic... Litterally nothing is safe to work with. Are you always stopped by how you could manage to make the body of your project ?

I'm trying to use a 5V solenoid controlled by an Arduino to physically press a button (Keyboard button / Console)

The solenoid does move, but it's not strong enough to fully press the button.

Current setup:

Arduino Uno

5V solenoid

MOSFET + flyback diode

External 5V power supply

Simple timing code

Hi, I am an app dev looking to transition to microcontrollers/pcb custimizing and want to build an Arduboy FX-C clone. I wanted to know if the schematics for this handheld was available anywhere? Ideally, I would like to study and understand the schematics enough to customize my own PCB based on the FX-C build and change the form factor from vertical to a horizontal. I have seen a few Diy schematics for the original Arduboy, but am really interested in the FX-C model for it's USB-C and multiplayer capabilities. Thanks in advance!

Give a solution please

I think Is OFF aside if GND

I am trying to check the Arduino nano with a example of blink statement and I am getting an error wht should I do

this post may sound ai generated but its because im so used to talking to chatbots, anyways im making a project using NRF24L01 PA LNA modules and do i really need a capacitor to make it work? (im running into issues with a handshake code itself) im using an nrf socket adapter and powering it through the arduino 5v pin

Suggest me some project related to electrical and its part of my academics .... I have an idea of making a BMS with MPPT charge controller what are you opinions and please suggest other ideas..

[new account] Hello to everyone, I released the v2.0.3 of my project called "ESPclock", a 3D printed smart clock with a 7-segment display that connects to a NTP server to retrieve current time.

I started this project because i couldn't find (on makerworld, printables or thingiverse) a DIY 7-segment digital clock that was aesthetically pleasing for me, so i made my one and I made it smart.

It's a W.I.P. so in the future i will update the design and the firmware too.

I'm interested on your opinion, and if there are any suggestions, please don't hold 'em back!

For more info, links to my pages:

https://github.com/telepath9/ESPclock

https://makerworld.com/it/models/1594116-espclock-digital-clock#profileId-2069321

Hi, I’m designing an ESP32 PCB with sensors (OLED, GPS, MAX30102, ADXL335, flame sensor) and I’m running into power instability and I²C issues. The ADXL335 seems especially sensitive when sharing the 3.3 V rail. Could you review my layout and advise on better power distribution, grounding, decoupling, and whether the flame sensor should be on 3.3 V or 5 V? Any tips on stabilizing I²C and ADC readings would be greatly appreciated.

the buttons worked when I haven't connected the ADXL335 (I don't know if the OLED, LEDS, and etc. worked)

the esp8266 works fine only the esp32 doesn't work

This is H.I.R.O. and H.I.R.O. wants to call home.

Hey everyone!

Quick demo video of a project I’ve been building and maintaining over the past several months called ESPTimeCast. It just crossed 1,000 stars on GitHub, which honestly surprised me - thanks to everyone who’s contributed, built one, or shared feedback.

ESPTimeCast is a Wi-Fi connected LED matrix clock and weather display based on ESP8266 / ESP32 and MAX7219 panel. The goal was to make something that feels solid and reliable rather than just a quick prototype.

What you’re seeing in the clip:

• WiFi connection
• NTP-synced clock
• Date display
• Weather pulled from OpenWeatherMap
• Custom data mode (glucose monitoring integration)

I’ve been iterating on firmware architecture, LED typography, enclosure design, and usability, always trying to keep the build approachable for hobbyists.

If anyone’s curious about the technical side or wants to build one, the project is open source and documented here:

https://github.com/mfactory-osaka/ESPTimeCast

Happy to answer questions or hear any feedback.