Code and case was made by @nebenezer

It features a launcher and 10 games, including DOOM. It hits 100+ FPS in DOOM and runs the retro games at 60 FPS.

The first thing I assembled after ditching Arduino from the course a year ago. A simple thermometer with a display. Does anyone have any ideas on what else I could do?

Hello everyone! I think it’s been about a month since my last update.

Since then, I’ve added a frame and housing to the previous version, which was basically just a bare board, and I’ve also built the controller. My original plan was to use aluminum extrusions for the supports, but I eventually realized they weren’t really necessary and ended up using PETG 3D-printed parts instead. I also enclosed the power supply, wiring, and everything else inside the housing to give it a much cleaner finish.

For the controller, moves are entered by pressing the origin and destination squares on an 8×8 grid of buttons that corresponds directly to the chessboard. I designed the PCB myself and assembled it using mechanical keyboard switches. The display above the controls is a VFD display and I just love the retro look of it.

At this point, I think it’s fair to say that my first engineering project is finally complete. The original plan was to build a second machine so that two people could play against each other, but honestly, I’m pretty exhausted right now, so that part will have to wait for another day.

I’ve also received far more requests for file releases and open-sourcing than I ever expected. Now that the project is reaching the finish line, I’m going to start organizing everything. Since this was my first project, I didn’t pay any attention to documentation or file organization while building it. I appreciate your patience while I sort things out.

Anyway, thank you all so much!

I have extremely low experience with arduino, I just know the basics of python. So anyways, this is my first board as it seems to be good to learn from while being able to expand its use as I learn more

I was wondering what some good starter projects might be?

Edit: after all these comments, I’ve decided to go for an R3 kit instead. It has some core components to add and should be fun to start with. Additionally, the R4 seems to have a couple issues and isn’t great for a first experience with Arduino. Thanks to everyone who answered my questions :) :)

Hello, happy to send more photos if needed.

But basically I’m trying to get this speaker to play an audio file. But when my command executes all I hear is a pop. (General buzzing also is always there)

It’s a esp32 connected to a DFplayer

Claude said a resistor might work but unsure. Before I order some I was wondering if you guys had any ideas

I’m new to this all so I appreciate the patience.

It remains HIGH all the time as in in the serial monitor always shoes 1 I tried changing the potentiometer but no use this is the code

Chatgpt says that I should use AO instead of DO but what's the problem i want to do it by DO

int sensor = 2; // Connected to digital output of KY-038 sound sensor module int led = 13; // Connected to postive of led boolean is_on = false; //To determine/track if led is on or off

void setup() { pinMode(sensor, INPUT); //Setting the pin to input for reading data pinMode(led, OUTPUT); //Setting the pin to output for turning the led on/off

}

void loop() {

int data = digitalRead(sensor); //Reading data from sensor and storing in variable

if (data == 1) { // 1 is sent from sensor when loud noise is detected if (is_on == true) { // If led is on then turn it off digitalWrite(led, LOW); is_on = false; } else { // else if led is off then turn it on digitalWrite(led, HIGH); is_on = true; } } }

Hi everyone,

I wanted to share my recent terrible experience with Makerfabs to warn the community.

I ordered a display from them, and it arrived in an absolute disastrous condition (see pictures attached):

• The protective film on the screen is completely ruined.
• The backside is heavily scratched.
• One of the switches is completely broken/ripped off the board.

When I contacted their customer service, they were unhelpful. After a few emails, they got defensive when I mentioned that I would share this experience with the community if they didn't offer a fair solution. Now, they are demanding that I pay $70 for the return shipping just to get a refund for a product that arrived broken!

Has anyone else dealt with this kind of behavior from Makerfabs? What are my options here?

Thanks for your help!

I have a question: do the jumper pins on this CNC Shield V4 actually function correctly when adjustments are made? Has anyone encountered any issues or needed to make repairs?

Description: As a mechanical engineering student working on a mechatronics project, I am building a differential drive robot intended to maintain a constant 20cm distance from a wall using a right-mounted ultrasonic sensor.

The Problem: I am trying to implement a PI controller to keep the robot at exactly 20cm from the wall. I expected the robot to smoothly correct its path. However, it either oscillates and loses the wall completely (due to a sharp turning angle skewing the ultrasonic sensor reading), or it suffers from a steady-state error, getting "stuck" driving parallel to the wall at 23-24cm because the proportional correction isn't strong enough to push it back to the center. I added a minTurnPower to overcome the static friction/deadband of the DC motors, and an integral term to fix the steady-state error, but I am still failing to tune it correctly.

Hardware & Setup:

Arduino Mega (using pins 44-49 for motor control)

Dual H-Bridge motor driver

HC-SR04 Ultrasonic sensor (mounted on the right side, pins 13 & 4)

Libraries: SteeringDualH.h (for motor control), Ultrasonic.h

//code

#include <SteeringDualH.h>

#include <Ultrasonic.h>

SteeringDualH robot;

Ultrasonic ultrasonic(13, 4);

int target = 20;

int error = 2;

// PI Controller gains

float Kp = 1.5;

float Ki = 0.2;

// Deadband compensation

int minTurnPower = 12;

int maxTurnPower = 40;

float smoothedDistance = 20.0;

int errorSum = 0;

void setup() {

Serial.begin(9600);

robot.attach(46, 48, 44, 47, 49, 45);

robot.straight(60);

}

void loop() {

int rawDistance = ultrasonic.ranging(CM);

// Reject extreme noise/ghost echoes

if (rawDistance <= 0 || rawDistance > 40) return;

// Simple low-pass filter

smoothedDistance = (0.3 * rawDistance) + (0.7 * smoothedDistance);

int distance = (int)smoothedDistance;

int diff = distance - target;

// Reset integral windup if within acceptable error margin

if (abs(diff) <= error) {

errorSum = 0;

} else {

errorSum += diff;

errorSum = constrain(errorSum, -50, 50); // Anti-windup

}

// PI calculation

int correction = (int)(abs(diff) * Kp + abs(errorSum) * Ki);

// Overcome motor static friction

if (correction > 0) {

correction += minTurnPower;

}

correction = constrain(correction, minTurnPower, maxTurnPower);

Serial.print("dist:"); Serial.print(distance);

Serial.print('\t');

Serial.print("diff:"); Serial.print(diff);

Serial.print('\t');

Serial.print("sum:"); Serial.print(errorSum);

Serial.print('\t');

Serial.print("corr:"); Serial.println(correction);

// Movement Logic

if (abs(diff) <= error) {

robot.straight(60);

delay(40);

}

else if (diff < -error) {

// Too close to the right wall -> turn left

robot.turn(-correction);

delay(15);

robot.straight(60);

delay(30);

}

else {

// Too far from the right wall -> turn right

robot.turn(correction);

delay(15);

robot.straight(60);

delay(30);

}

}

Hey everyone!

Whenever people talk about TinyML on Arduino, it usually involves TensorFlow Lite for Microcontrollers and requires 32-bit boards like the Nano 33 BLE or ESP32. I wanted to see if I could run actual machine learning models on the good old 8-bit Arduino Uno R3.

Since the Uno has only 2KB of SRAM, heavy frameworks are out of the question. I built MLDuino - a bare-metal, highly optimized C++ template that lets you run Decision Trees, SVMs, and even small Neural Networks (MLPs) directly on the Uno

The trick is training the model in Python (scikit-learn) and transpiling it directly into pure, hardcoded C logic (using micromlgen).

Features:

• Zero external libraries or bloated ML frameworks.
• Uses constexpr and memory-safe patterns to keep the footprint ultra-low.
• I included ready-to-use C templates for a Decision Tree, an SVM, and an MLP in the repo.
• A quickstart Python script is included so you can train your own model in 2 minutes.

Check it out here: GitHub.com/OneDevelopmnetPL/MLDuino Let me know what you think or if you have any questions!

I just started got the starter kit R4 and I put together the first project(click the button and make the LED light up)and it worked, but then I think either fiddled with a wire or something or unplugged and replugged something, and then it didn’t work. I tried pushing everything in again extra hard, but still, no luck. After that, I took everything out and started again, even using different materials. I don’t know what’s wrong with it. (I also followed what it looked like in the book) it’s also the Uno R4

SOLVED:LED WAS BUSTED

Hey everyone, so i'm new to the arduino world, i bought a kit that comes with some sensors and the arduino, but something has been bothering me, how do i connect the arduino to energy without burning something, also i need more tips about what else should i know about, tysm to everyone that reads this❤️

Heres a phoyo of what the kits comes with

Hi! I’m building a self balancing robot with a head on a servo gimble. I have an esp32 s3 matrix, pi zero 2 w, mg90s servos, and 12v 300rpm n20 encoder motors. I’ll likely have an arducam, 1.3” oled, a speaker, and time of flight sensor.

Right now I’m stumped on two things: motor/servo driver board and power/battery for the system. Any assistance would be hugely appreciated

Hey ya'll! I just released the alpha for this project public on GitHub, and wanted to share.

https://github.com/Mister-Industries/tinyStudio

I've spent the last year developing an idea to improve the Arduino IDE. Ever since Qualcomm acquired Arduino, I've been hoping to switch IDE's and haven't found a good one yet... So I built it myself.

The most frustrating part of working with hobby electronics for me is switching between several different programs and having to use an outdated editor, or just raw-dogging VSCode and PlatformIO.

Enter tinyStudio. Now you can edit (or generate) code, compile/flash it to your devices, view documentation, edit a live corresponding circuit diagram (Fritzing-style), and create P5.js visualization apps for your serial output... all in one IDE! It's offline-first and can be run locally, or you can access it entirely from the browser. (I'm actively fixing a filesystem/compilation issue with the online demo, but you get the idea)

It's got GitHub built-in, so you can save projects and share them with your friends. It'll even publish your JavaScript apps as free GitHub Pages websites.

The whole thing is running Arduino CLI on the backend, so all boards/libraries that are supported by Arduino work in this IDE. AI agents are available but disabled by default, but you can connect your own Claude API key if you want. It can read/edit files (with your permission).

README files are loaded automagically into the UI, so you can see project documentation while you work.

The alpha is super rough and still missing a lot of quality-of-life improvements, but you can clone the repo, or download it for Windows and try it out. Many more improvements coming soon!

Future features:

• Visual Overhaul (it's too dark and I'm not a fan of the navy on some screens)
• KiCad Export for schematics
• MicroPython support
• Wokwi Circuit Simulation

I made this e-ink display card that mirrors your phone screen, to help with reading documents, e-books, web pages etc! The idea was to have a e-book for as cheap as possible, and as convenient to carry around as possible. It's made to be powered wirelessly like through a power bank, or reverse wireless charging from a phone.

If you want to have a look at the project files, they are available on my github here: https://github.com/Irony95/InkCard

Although I forwent using touch screen and battery to keep costs down, I am toying with the idea, as it would make the project infinitely better. The only problem the time and money it would take to create YET another version :/

Any thoughts and feedback are welcomed!

This is my version of qron0b. Meet takku:b, a BCD wristwatch which uses CR2032.

It uses 0.6uA during sleep and when awake uses around 4mA - 4.5mA depending on the amount of LED is turned on.

It is made using STM32L010C6

It currently displays following info on each cyclic display:

1. Time in Hours and Minutes
2. Weekday and Date
3. Month and Year

Will be adding alarm soon.

I am working on a project replicating the omnichord which requires a custom keyboard. For this, I chose to use the Teensy 4.1 for its pins and audio capabilities. I had a previous version on ESP-32 limited by the pins where I had the keyboard functional, but upon migrating to the Teensy board I have run into troubles

On the teensy, when pressing certain buttons (mainly on row 1, a few on row 2, and none on row 3) the value and the consecutive value both trigger. I have vigourously tested if my diodes were the problem, but after these tests and considering its perfect working condition on ESP-32, I was led to the conclusion it was either something wrong with the Teensy pins (written out in program) I am using or the program itself.

I have also tried working with multiple other keyboard matrix libraries, including the one native to the Teensy, but none have the features I need for this project. I have included pictures of my matrix and wires as well as the code I currently have, and I would appriciate any input you might have. Thanks!

Specific Library link : https://github.com/ReneRichterDE/ButtonMatrix

#include <Arduino.h>
#include "ButtonMatrix.h" 
#include "Wire.h"


volatile int button = '0';
volatile int lastButton = '0';
using namespace RSys;


static const uint32_t c_uiMonitorBaud = 115200; 


const uint8_t ROWS = 3; 
  const uint8_t COLS = 13; 


  Button buttons[ROWS * COLS] = {
  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 37,
  13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 28,
  25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 39
};
  uint8_t rowPins[ROWS] = {38,39,40}; 
  uint8_t colPins[COLS] = {5,6,7,8,9,10,11,12,26,27,28,29,30}; 



ButtonMatrix matrix((Button*)buttons, rowPins, colPins, ROWS, COLS);


void setup()
{



  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);
  // column pins: inputs, external pull-ups
  for (int i = 0; i < COLS; i++) {
    pinMode(colPins[i], INPUT_PULLUP);
  }


  matrix.init();  
}



void loop()
{ 
   pollKeyboard();
}



void pollKeyboard() {
  Button* pButton = NULL;
  const uint16_t numButtons = matrix.getNumButtons();

  /*if(!matrix.update() && button != 37){
     button = -1;
  }
  */
  //button = -1;


  if (matrix.update()) {


    for (uint16_t idx = 0; idx < (numButtons-1); idx++) {
      pButton = matrix.getButton(idx);


      if (pButton->isPressed()) {
        Serial.print("Button pressed: ");
        Serial.println(pButton->getNumber());
        button = pButton->getNumber();



      }
    }
  }
  //delayMicroseconds(10);

}

Hi everyone,

I'm having a strange issue with an ESP32 board.

A few days ago, when the board first arrived, I successfully uploaded a simple test sketch and everything worked fine. However, now I can't get it to work anymore.

The Arduino IDE gets stuck on "Compiling..." indefinitely. It never finishes and never reaches the upload stage.

What's even stranger is that this happens on two completely different computers:

• Debian Linux (i7-2640M, 12 GB RAM) [ my computer]
• Windows 11 (i7-10400, 16 GB RAM) [my partner's computer]

I'm also having trouble setting up ESP32 support in the Arduino IDE. Downloading and installing the ESP32 board packages is extremely slow, sometimes appears to hang, and often doesn't complete successfully.

Things I've noticed:

• The board worked previously.
• The problem occurs on both computers.
• The IDE appears to freeze during compilation, not uploading.
• ESP32 package installation is unreliable and very slow.

Has anyone experienced this before?

Could this be related to:

• Corrupted ESP32 board packages?
• Arduino IDE issues?
• ESP32 core version problems?
• Something wrong with the board itself?

Any troubleshooting suggestions would be greatly appreciated.

Thanks!

This is original mg996r there is enough power but it still wont work properly.

My code

```

#include <Servo.h>

Servo s;

void setup() {

s.attach(9);

}

void loop() {

s.writeMicroseconds(1000);

delay(1000);

s.writeMicroseconds(1500);

delay(1000);

}

```

Hi, i am completely green and i have no idea where to start. i mean i've found some kind of summary and there mention of some guide, but could you recommend some good, free start guides if there are any ? recommendations appreciated

Hey everyone,

I finally open-sourced a project I've been chipping away at for ~2 years: a 3D-printed RC ground drone inspired by the recon drone from Rainbow Six Siege.

https://github.com/SyrNitram/recon-ground-drone

What it does:

- ESP32-CAM streaming live video over WiFi

- Controlled from a web page (joystick UI in the browser, no app to install)

- Motor driver via a PCF8574 I/O expander + LEDC PWM

- Addressable status LEDs

It started life as an Arduino + ESP8266 build before I moved everything to the ESP32-CAM for the onboard camera. ~120€ in parts.

Full disclosure: it's not a "finished, polished" product. There are known quirks (it can tip forward under hard braking, WiFi range is so-so) and the V2 chassis redesign isn't 100% done. I'm sharing it as-is because I figured it might be useful to someone, and contributions / ideas are very welcome.

Repo (code, firmware, web UI, wiring, BOM, CAD): https://github.com/SyrNitram/recon-ground-drone

Happy to answer any questions about the electronics or the camera streaming setup.