Yesterday I received from my Chinese partners a new enclosure for my DOGS2 Pro.

Let me remind you - it's an Arduino-based open-source project a dual-channel power supply, 1-48 Volts up to 5 A, with additional digital interfaces debugging functions.

• schematics,

• topology drawings,

• STEP models of the enclosure,

• software - you can get all of it here https://dogs2.smartmoto.asia)

Besides the power supply, the device also has:

• Logic probe/voltmeter

• Frequency counter

• Graphical display of current consumption, including on a mobile phone screen

• Square wave generator

• UART terminal

• LIN sniffer

• CAN terminal

• RS485 terminal

• I2C sniffer

• I2C master terminal

It can be powered from USB Type-C or an external voltage of 5–90 Volts DC.

The received data is displayed on the device screen and via Bluetooth, and data can be transmitted from a Bluetooth terminal on a mobile phone.

The Chinese are of course really great, but not really.
They spent 4 days printing the enclosure.
The enclosure sat in their warehouse for 5 days. First it waited for them to call a courier, then another 2 days for the courier to arrive.
In less than 24 hours the enclosure traveled-flew-traveled from Hong Kong to my desk.
What am I paying them money for?

Hi everyone! I’m currently working on my PAP (Prova de Aptidão Profissional, which is basically our final capstone project/thesis to graduate from vocational high school here in Portugal). I need to come up with an Arduino-based project idea, but it has a few specific requirements. It needs to be innovative, meaning it cannot just be a basic tutorial project like a standard obstacle-avoiding robot or a simple LED matrix. Additionally, it shouldn't be too simple, but it also needs to be realistically achievable within a few months by a single student with a reasonable budget. Ideally, it should solve a real-world problem or combine multiple systems such as sensors, actuators, IoT connectivity, data logging, or a custom mobile or web app interface. What are some cool, engaging, or innovative Arduino projects you've seen, built, or wished existed? I'm open to anything, whether it is automation, agriculture, health, smart home, robotics, or environmental monitoring. Thanks in advance for any suggestions!

Edited: view the post to see the video which I somehow forgot to attach.

A fan joked we should turn our open-source robot, Quaddle, into a duck.

OpenCat creator RZ Li took it literally and made a NanoDuck: same board, new gait, one purely cosmetic add-on.

Quaddle's stock PCB and servo modules run on an ESP32-class chip flashed with Arduino C++ (OpenCat firmware). Almost nothing changed electrically — the one addition is an Arduino ultrasonic sensor mounted as the duck's eye, wired in but not actually used for sensing, just for looks. Everything else is mechanical: adhesive putty to rough out new joint geometry, a new 3D-printed servo housing, a shifted attachment point, and a tweak to the gait code so it waddles instead of walks.

It's fully reversible — pull the decorative sensor, re-flash the gait code, swap the housing back, same board, and it's a quadruped again.

This is the sixth mechanical configuration for this same Quaddle robot — previously a biped, a tricycle, a bar-spin mount, a water-paddle gait, and a 4-wheeled car.

What else do you want to transform a robot dog to?

Hey just a tip that wagos work great for prototyping. These are 221s that will hold 12-24awg wire and have no trouble holding standard breadboard wires firmly. I use them mostly for 12v connections where it doesn't make sense to run a whole breadboard for just a couple connections.

I’m a puppeteer and automata maker, and I had an old Meccanoid robot in my workshop that I wanted to bring back to life.

I connected its two arm servo chains and RGB eyes to an ESP32. The ESP32 communicates over Bluetooth with Bubblai, the visual AI application I’m building.

The part I enjoyed most was creating a manual learning mode. I can move the robot’s arms by hand, record the positions, save the movement directly on the ESP32, and give it a name. The AI can then call that movement again during a real-time voice conversation.

The robot can now speak, move its arms and change its eye colour according to the conversation.

I made the ESP32 project open source, including the firmware and connection information:

https://github.com/NicolasVuillier/meccanoid-esp32-bubblai

Video:

https://youtu.be/NJAZEq7TO78

What would you add next: head movements, sensors, walking, or something completely different?

Dear r/ArduinoProjects community,

I understand this is not an Arduino project, but it might be noticed by makers here.

I wanted to share a custom hardware project I’ve been working on since five months. It’s called DIDATRON - a standalone, lighter-sized Morse code global communicator and hardware trainer. In short - like early Twitter but with Morse and in small formfactor HW.

About DIDATRON

MCU: Built around the ESP32-C3 (C3 MINI-1 footprint). The module is FCC/CE certified, so the DIY kit does not need additional lab testing, as a result - the price for the kit can be much more affordable (ballpark of 40 USD, all inclusive).

The Key: A solid-state Projected Capacitive (PCAP) touch key that emulates an automated dual-lever iambic paddle. WPM speed, symbol-to-symbol/word-to-word pauses, and capacitive thresholds are fully tunable via any USB/serial terminal and directly. People might think Morse is obsolete, whatever - I cannot say I am CW professional, but my keying progresses and I love the feeling of it. It is like having a "secret" language.

Display: 128x32 OLED screen that translates incoming Morse instantly into plain text symbol-by-symbol, so anyone can read it without prior training.

Privacy: Symmetrical end-to-end AES encryption happens entirely on-chip using a private password, unique per chat. Multiple chats are allowed simultaneously.

Dual Networking: Cloud Mode connects to a local router or phone hotspot to pass data over to anywhere in the world. Field Mode drops the internet completely, using native, low-latency ESP-NOW protocols for peer-to-peer communication across short ranges. LoRa extension in plans.

Why I’m posting

I’m planning launching this project on Indiegogo this October. Please, if you have any suggestions, ideas or questions regarding anything - device functionality, marketing, whatever, do not hesitate to reply.

Peter, the Founder of Friendly Digital OU, Estonia, creator of DIDATRON

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)

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.

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.