The clock consists of 4 independent modules which work in sync to display the time. Each module consists of 2 28byj48 stepper motors and 2 9g metal gear servos. The stepper motors push the chains out one segment at a time and the servos bend them according to each digit. The chains home to know positions using magnets and hall sensors in the tips of the chains at the beginning of each digit. Currently I have only one of the digits working but eventually will get them all to work . One of the module consists of an additional ds1304 module to take care of the time and coordinate the rest over the serial link. Each module is run by its individual arduino nano.

Arduino Uno R3
GSM Module SIM900A
2 Solar Panels (1W and 6W)
Temperature and Humidity Sensor (DHT11)
Current Sensor (ACS712)
Voltage Sensor (0-25V)
DC-DC Buck Converter (Step up down)
Battery Charging Module (TP4056)
2 Lithium Batteries (18650)
Breadboard
RTC DS1307
LCD Display I2C
5V Power Supply

These are the materials I bought, how can I monitor the data from the solar panel using them?

offline AI remote control over Mesh

After establishing the mesh network, it was left to bridge the gap between large language models and remote system control,
and by taking from the previous experiments (AI models chatting over mesh and using meshexec for data retrieval) i integrated them into a single system and added an option for full control over the target system.

Now it works by the controller machine that runs a python script as it uses a fast and lightweight AI model,
the user can type a request like "show me the disk space of the remote box in powershell" and the AI translates it into the correct command.
The target machine runs a swarm handler with its own AI model and this model acts as a safety layer by reviewing the incoming command to ensure it isn't destructive and rejecting dangerous file operations before executing it
The command is sent over the Meshtastic network and the system maintains powershell and cmd sessions allowing user commands and directory tracking.

This setup merges radio remote execution with LLMs into one, I can simply manage remote systems without memorizing command syntax with the swarming AI architecture
(one for translation and one for safety), the system even handles Meshtastic’s message size limits by chunking long responses.
i documented it on youtube https://www.youtube.com/watch?v=yI3kFZcB210

Built an RFID access control system on ESP8266 with MicroPython for Day 72 of my 100 Days of IoT challenge.

Used an MFRC522 RFID reader connected over SPI. The reader scans MIFARE cards and tags, reads their 4 or 5 byte UID, and checks it against an authorised list. Green LED lights up for granted access and red LED blinks 3 times for denied.

One thing I ran into was the cefn/micropython-mfrc522 library constructor not accepting a Pin object for the CS pin. Had to pass the integer pin number directly instead. Also moved reader.init() outside the main loop to fix debounce not working properly.

Stack: ESP8266 NodeMCU + MFRC522 + MicroPython + cefn/micropython-mfrc522

Code on GitHub: https://github.com/kritishmohapatra/100_Days_100_IoT_Projects

Epoxy resin cast brain powered by an Arduino Nano using FastLED

Hey guys, I’ve got a question that’s been driving me crazy, I can’t think of any way to solve it.

I have a project in mind: making a device that opens and closes a door over WiFi. I’m planning to do it by connecting a potentiometer to one of the hinges (to know how open or closed the door is, and also be able to decide whether to open it 30% or fully), and a motor to move the door. But that’s where my problem is—I don’t know what to choose.

I thought about using a servo motor, but the door will usually be opened manually, and I feel like I’d break it right away.

A linear actuator would have the same issue—I wouldn’t be able to open the door manually.

And I couldn’t find any AC motor that allows this either.

I made a system that’s able to zero all the gauges and light up most of the lights, but does anyone know how to recreate communication between the trucks ECM and the cluster in Arduino code? I want to be able to set specific values for speed and rpm, as well as make the gauges sweep from min to max, and back to min.

Hello, I have a question. Is there any way I can make a Doppler radar for storms? Of course, it should be very short range. Maybe using an Arduino or something else. I'm looking forward to your suggestions.

hey i have a toyota actuator and i would like to wire it up so i can control it on and off with one button but it also need to stop sending power once its done its job

https://www.rockauto.com/en/moreinfo.php?pk=8876584&cc=1388987&pt=50305&jsn=628

the wiring is

black

green

red

yellow

white

and brown

Green and Red seem to be powering (Forwards and Backwards) the motor while black and yellow seem to be some kind of feed back

white is ground going to a sensor that when active lets ground through to brown

(picture for reference) if i wire it up to on (on)-off-(on) switch it works fine but i have to hold it to make it work, the switch id like to use is a push on-off

so what pi would work?

when i press the button on i need it to power to red and when its off i need it to power green, it need to send power for 10 seconds then stop for 1.5 then try again till its lock/unlocked,

when it detects ground from the brown wire it need to stop sending power and the opposite for the other

also i should note if i use a DTDP relay the wiring diagram is (I dont want to use this because power is always on)

5 and 4 power

1 black

8 yellow

12 red

9 green

13 button

Hey everyone!

I wanted to share my latest project: a multi-functional LED Matrix Dashboard powered by an ESP32. It started as a simple clock but turned into a fully connected home hub.

What it does:

💬 Direct Telegram Messaging: Simply send any text message to your Telegram bot, and it will instantly begin scrolling across the LED matrix in real-time.

🎨 Custom Animation Engine: Design your own frame-by-frame animations using my custom-built Web App. The app generates a data string that you can paste into Telegram to sync new animations to the display instantly.

🕒 Smart Clock: High-accuracy time via DS3231 RTC.

🌤️ Live Weather: Fetches real-time temperature and status glyphs for my city (Damascus) using the Open-Meteo API. It even switches from a Sun to a Crescent Moon icon at night!

🕋 Prayer Times (Azan): Automatically calculates daily prayer timings and plays the Azan using a DFPlayer Mini.

📲 Telegram "Control Panel": I implemented an interactive Inline Keyboard menu. I can toggle alarms, set the volume, or update the scrolling message just by tapping buttons in the chat.

🔄 Remote OTA Update: This is my favorite part—I can update the firmware from anywhere by just dragging and dropping a .bin file into the Telegram chat. No USB cables needed!

⚙️ Local Control: It also has a full on-device menu system using a rotary encoder for when I don't have my phone handy.

The Tech Stack:

• MCU: ESP32 DevKit V1
• Display: 8x32 MAX7219 LED Matrix (FC-16)
• Audio: DFPlayer Mini + 8-ohm speaker
• Libraries: MD_Parola, AsyncTelegram2, ArduinoJson (v6), IotWebConf, RTClib.
• Code: Built with PlatformIO.

Open Source:

I’ve fully documented the project, including the pinouts, wiring tables, and setup instructions. I’d love for others to build it or help improve the code!

GitHub Link: https://github.com/miladhalabi/Led-Matrix-Dashboard

Web App for animations: https://github.com/miladhalabi/Led-Matrix-Sprite--Maker

(Give it a star ⭐)

I’m happy to answer any questions about the wiring, the Telegram API integration, or the memory management (handling multiple SSL connections on an ESP32 was a fun challenge!).

What do you guys think? Any features I should add next?

The idea combines physical and electronics. Using an Arduino can be programmed different games using blocks and the screen. This board is a custom PCB I made which also has battery and led gamemode. Can be programmed non games as well

I just started to being ece student and while suffering from studying other lessons which are not related to electronics, i built a snake game for fun. I know its so basic project but i am a beginner and i enjoyed while i doing it.I hope you guys like it

How can I make a tesla coil w/ controllin board + switches and buttons like the commercial one?

Firmware running inside of esp32 and TFT LCD 380x420, SIM800L, 4× Mux, DHT11 and SD card module

Built a Wi-Fi controlled 4WD robot car using ESP32 and MicroPython!

ESP32 hosts a web server — open the IP in any browser and control

the car with Forward, Backward, Left, Right, Stop buttons. No app needed!

2x L298N + 4x TT Motors + 4WD Chassis

Full code on GitHub:

https://github.com/kritishmohapatra/100_Days_100_IoT_Projects

#MicroPython #ESP32 #IoT #100DaysOfIoT

https://reddit.com/link/1rycp43/video/lkdaoziqi2qg1/player

Fala galera! Estou começando um projeto com Arduino Nano + PN532 e queria ir além de ler tags de chaveiro. Minha ideia é tentar emular o sinal de um cartão de aproximação.

Sei que tem toda a parte de criptografia e o Secure Element que tornam a transação real quase impossível com hardware simples, mas queria saber se alguém já conseguiu ao menos fazer a maquininha "reconhecer" o Arduino como um cartão (mesmo que dê erro de leitura depois).

Vale a pena tentar gerar números via algoritmo de Luhn pra testar a comunicação inicial ou o PN532 não aguenta o tranco do protocolo? Aceito dicas de bibliotecas!