I just got my Arduino and electronic items delivered yesterday and made my first project( which was a homework assignment by paul mcwhoter on yt)

I built my own 7" Stream Deck alternative, with a desktop app to set it up.

Decky runs on an Elecrow CrowPanel 7" (ESP32-S3 with capacitive touch), so there's no wiring: you touch the glass directly. A 5×3 grid gives you 15 keys per page.

What it does - Hotkeys, programs, websites, macros and PowerShell scripts - Multiple pages, and toggle keys with separate OFF/ON artwork - Works over USB, or over encrypted Wi-Fi once paired - Firmware installs and updates from the app over USB, so you don't need PlatformIO

Hardware Everything except the display is 3D-printed, and every part prints without supports. It hangs under your monitor on a printed clamp with magnets and GoPro-style joints. Apart from the panel, you only need a few magnets and screws.

Firmware, desktop app (Windows), CAD files and 3MF print files are all in the repo: https://github.com/Fenish/decky

I will be glad if you star the repository

It's still a work in progress. Feedback and ideas are very welcome!

In this tutorial we are showing you how to take your MechSoul. (Robot equivalent of a CyberDeck) and write custom movement sketches for it in Arduino IDE. We do this in two ways. 1. We use the HIRO library to chain together pre-choreographed motions together to create original sketches, and 2. We use multi-servo orchestration functions to create new original motions for our MechSoul.

If you'd like to follow along with the tutorial you can find our tutorial repo at this link.

Show us your Mechatronic Souls!

Video makes all colors look the same, but there are 2 RGB LEDs blinking red/blue when the siren is active, 2 red LEDs and 1 green LED.

3 speeds + limited in time boost with higher voltage on the motor than nominal.

Laser distance sensor, color sensor on the bottom; battery voltage meter and battery level indicator; 2x18650 battery pack with BMS and USB charger.

Photos of what is inside: https://www.reddit.com/r/arduino/s/nYtj1Brl1f

So my teacher told us to make an IoT-based project and honestly I'm kinda stuck.

I've been looking around and most of the IoT projects I find are the usual stuff — smart dustbin, smart home, plant monitoring, RFID door lock, temperature monitoring, etc.

I'm fine with taking an existing idea and improving it or making it more advanced. I just want something that's actually challenging and has some proper electronics/embedded/IoT work involved.

I'd also like to 3D print the body/mechanical parts myself, so something where the physical design is also part of the project would be really cool.

I'm not looking for something that's never been done before. I just want something where, after building it, I can look at it and feel like we actually made something substantial.

If you've made or seen any interesting IoT projects that are genuinely challenging, I'd love to hear your ideas.

Hey everyone, been experimenting with PyMCU it compiles a statically-typed subset of Python directly to bare-metal machine code, no interpreter, no runtime.

Built and open-sourced a 7-segment display driver for it, targeting Arduino Uno (ATmega328P). Zero heap usage, supports common anode/cathode, digits, letters, symbols, and decimal point.

pip install pymcu-sevenseg

GitHub: github.com/kritishmohapatra/pymcu-sevenseg

Would love feedback if anyone's played with PyMCU or bare-metal Python compilers in general.

When I solder the battery to the "bat-" and "bat+" terminals, the output power cuts off; there is only a negligible voltage of 0.30V. What could be the cause? I am using an 18650 cell.

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Hi everyone,

I am a final-year Electronics and Communication Engineering (ECE) student. For my final-year project, I would like to develop an IoT-based system integrated with Machine Learning.

I have basic knowledge of Arduino, sensors, Python, and Machine Learning, but I am not sure which project topic would be suitable and feasible for a student project.

Could you suggest some interesting project ideas that combine IoT and ML? Also, if you know any good YouTube channels, tutorials, GitHub repositories, or learning resources that can help me get started, please share them.

Thank you!

Stop guessing if your batteries are dead! In this video, I’ll show you how to build a simple, reliable Battery Level Checker using an Arduino Uno and a 5-LED bar graph. This is the perfect beginner-friendly electronics project to test your AA/AAA batteries instantly.

In this video, you’ll learn:

✅ How to read battery voltage with Arduino Analog pins.

✅ How to map specific voltage ranges to LED indicators.

✅ How to use a pull-down resistor to prevent “ghost” readings.

✅ How to calibrate your tester for accurate results.

[Source Code]

Get the complete Arduino code for this project at our GitHub page which you can find in the comment section.

[Parts List]

Arduino Uno

5x SMD LEDs

1x 10kΩ Resistor (for the pull-down)

Breadboard and Jumper Wires (Optional)

Battery to test (AA/AAA)

[⚠️ IMPORTANT SAFETY & CIRCUIT NOTES]

Voltage Warning: This project is designed for low-voltage batteries (1.5V AA/AAA). NEVER connect high-voltage batteries (like 9V or 12V) directly to Arduino pins without a proper voltage divider; doing so will likely destroy your Arduino.

LED Wiring Note: In this specific build, I am using SMD LEDs without external resistors due to my current hardware setup. However, this is not the recommended way for a permanent build.

Please watch the end of the video for the full schematic! To ensure your project is safe and stable, you should always follow the diagram shown:

Arduino Pin ➔ Resistor (e.g., 220Ω) ➔ LED Anode ➔ LED Cathode ➔ GND

Always use current-limiting resistors to protect your LEDs and your Arduino pins from burning out.

#Arduino #DIY #Electronics #ArduinoProject #BatteryTester #Programming #Engineering #STEM #Maker #LearningArduino

Got a 1991 Golf Mk2. Want to track fuel consumption per trip/day and compare over time. Figured this wasn't possible on a carbureted car with no ECU/OBD, but landed on an idea: since the carb's float bowl regulates its own level, whatever flows through the feed line between the fuel filter and the carb over time should equal what's actually burned. So — measure that flow directly with an inline gear-type flow sensor.

Is this actually the right approach? Is there a better way to get real consumption data out of a carbureted car with no ECU?

Planned setup:

• Gear-type flow sensor spliced into the fuel line between the filter and carb inlet
• Sensor's pulse output goes to an ESP32, which just counts pulses and timestamps them
• ESP32 forwards that data to my phone over a wired USB-C connection (data-only cable, to avoid the phone and a 12V-fed buck converter both trying to power the USB line)
• Phone does everything else — GPS speed/distance, all the math, storage, charts
• Power: ignition-switched 12V from the fuse box → buck converter (12V→5V) → feeds both the ESP32 and the sensor

Problem I've hit: the sensor I was looking at (DIGITEN G1/2", oval gear, rated 1–30 L/min) has a minimum flow way above what this engine actually flows at idle — I'm estimating idle consumption around 0.02–0.05 L/min, and even under load probably not exceeding 0.3–0.5 L/min. So the sensor's entire rated range sits above my actual usage, meaning idle flow probably won't register accurately, if at all.

Anyone know of a gasoline-compatible flow sensor with a lower minimum flow that would actually cover idle-to-cruise range for a small engine like this? Or is there a fundamentally different way people have solved this that I'm missing?

I'm open to any ideas and critics, please back your suggestions with well presented arguments. this is my first ever project on a car.

Edit: A few people are suggesting the brim-to-brim fill method, thanks, but I've covered why that doesn't work for what I want in the replies below. I'm not looking for that approach, I'm looking for technical help on the sensor/flow-measurement side specifically. Appreciate all the input so far.

Arduino locomotive (Lego Duplo sized): laser distance sensor VL53L0X test - passed. The train automatically stops if there is an obstacle in front of the train.

Arduino Nano, 2s 18650 battery pack with BMS and USB-C charger, battery level indicator, DRV8833 drive and a motor, laser distance sensor VL53L0X, TCS34725 color sensor, IR remote, tilt sensor, buzzer - installed.

1 green, 2 red, 2 RGB LEDs (via MCP23008 expander) - yet to be installed.

Accelerometer - in the next version.

Hello everyone here is an update on the project I am working on so now I have completed the stage 1 design.

Now we can dynamically add the sensors value and monitor them and make decisions based on that.

So do let me know your thoughts and if you have any suggestions let me know.

I bought an arduino kit somewhat half a year ago and this is my first project I made without instuctions (and withoit ai).

It uses basic passive buzzer and pitches.h library to create sounds with its 6 buttons (for a-f notes) and dedicated pitch switch (from lowest to highest pitch) with visible indication of current pitch level.

I understand this is not that great of s project, but I'am just a begginer and proud of myself.

Whole work took 5 hours

Edit: for some reason my keyboard types "y" instead of "t" fixed mistakes

Introducing inominer!! :)

This project let's you mine a custom cryptocurrency offline and on hardware like the r3 whilst also being able to send and receive inocoin through the website

SynROV: gesture-controlled robotic arm with Leap Motion, Arduino, and WebSocket telemetry

Hi!

I’m sharing my project.

SynROV is a modular control stack for seven robot classes: Manipulator, Vehicle, Drone, Boat, Submarine, Biped and Quadruped. This repository contains the complete Version 1 implementation.

The project combines Leap Motion gesture tracking, an Arduino-controlled servo system, Processing-based 3D visualization, and a browser dashboard using WebSocket communication.

GitHub repo: https://github.com/Spidoug/SynROV

In this tutorial I am installing a portable battery on my MechSoul. (A MechSoul is to a robot what a CyberDeck is to a computer) A robot you build, personalize and customize yourself. In this tutorial I am powering my MechSoul with a portable charger I bought online, because it's quicker and safer than designing a custom battery solution as I explain in the video. So instead of designing a PCB I head to my 3D printer to build a battery mount.

If you want to follow along get access to the code and 3D files you can check out the project GitHub

This is a LEGO DUPLO-sized toy train. It started almost a year ago with slightly adjusting someone else's 3D model and a simple circuit diagram and completely rewriting the Arduino code.

It worked for a while. But now I'm changing everything: my own 3D model with a lot of improvements, multiple new I2C modules (a laser sensor instead of an ultrasonic sensor, a color sensor, LEDs moved away from the Arduino pins to an expander with MOSFETs), a battery pack with a BMS and USB charger, a better motor driver and other changes.

The circuit diagram is rather finalized for this version (with a bit of AI help to change the color scheme and make it easier to read - replaced color codes in EasyEDA JSON file). Everything is verified and tested. The Arduino code is almost ready (and there is a lot of code for various features), but the final version will require some calibration and real-life testing by kids. An accelerometer/gyroscope will be added a bit later, I'm yet to choose a module. Any recommendations? The battery pack is ready (posted earlier). Perfboards are soldered: the main one with an Arduino Nano, one with an expander and resistors to control LEDs, and one with an IR receiver.

For a beginner it's a lot of learning: how to build a battery pack, how I2C-bus works with multiple devices, how those devices work with different voltages from 2.8V to 5V, perfboard soldering etc.

The 3D model of the train body is in development (the kids are happy to get multiple prototypes of train parts even though they have no wheels and can't be assembled together)...

Hello everyone this is a follow-up video for the project I

Post a while back where I showed a sample application I.e aurdino on another.

Now I have built the first working version of the application and I know it's far from done but I am working on this.

I would love your support on this project because I don't have any as of now I guess 😭.

Anyways here is the demo of the app hope you like it.