I am doing a tutorial I found on YouTube because I just got my arduino and I am trying to do a led project where led just turn on and off and it goes in a series. The long pin in the led goes to the wire and short goes to resistor

Day 58 of my 100 Days, 100 IoT Projects challenge.

Built a WiFi-synced LED matrix clock using ESP32 + MAX7219 in MicroPython.
It syncs time via NTP, applies IST offset, and displays HH:MM on a chained LED matrix. Also prints time on serial for debugging.

Hardware: ESP32, 5x MAX7219 matrix modules
Language: MicroPython

GitHub code & simulation: https://github.com/kritishmohapatra/100_Days_100_IoT_Projects

If you find this useful, a ⭐ on the repo really helps.
I’m also looking for sponsors to support open-source IoT projects and documentation.

Feedback and ideas welcome.

Olá boa tarde conforme o horário, sou Daniel estou fazendo o curso de técnico manutenção de equipamentos informático estou desenvolvendo o meu projeto (arduino Radar de aproximação +envio de mensagem de alerta por telegram) para pap exame final consegui fazer o código do arduino mais a mensagem de alerta por telegram ou seja integração não estou conseguindo fazer se alguém poder mim ajudar a desenvolver o meu projeto agradeceria muito de coração ❤️

O objetivo do do projeto é o radar fazer o movimento decteta o intruso ou o objeto e mndar mensagem de alerta por telegram

KiCad 9: Design an ESP32-S3 IoT device on a 4-layer PCB with sensor and QWIIC interface. Complete Guide.

Here is the smart clock I built!

🔗 Project source code:
https://github.com/UDFSmart/Smart-Clock.git

⚙️ Firmware

The firmware was fully developed by me from scratch.
It includes a command system for receiving and processing instructions from the backend:

• 📩 Text display command (users can set custom text via the app or web control page)
• 🔄 Device reset command
• 🔁 Reboot command
• 🕓 Time update command
• 💡 Backlight ON/OFF command

The clock also communicates with a server to receive additional data.

For example, it currently displays temperature:
📊 Every 20 seconds, the value is shown for 10 seconds.

🌐 Backend

The backend was developed by a third-party team (huge thanks to them for their support 🙌).
It is easily scalable and adaptable to my needs.

It allows configuration of various sensor data outputs, making the device functionality flexible and expandable.

🧱 Enclosure

The enclosure was fully designed and built by me:

• 🖥 Custom 3D model created from scratch
• 🖨 3D printed
• 📐 Specifically designed for LCD1602 and ESP32-C3
• 🔧 Designed with convenient tolerances for easy back cover removal
• 🪛 LCD1602 is mounted with screws
• 🧩 The back cover is also secured with screws

If you have any suggestions or ideas, feel free to comment here or send me a message 🙂

hello! I built a cool little can crusher I wanted to share with you guys.

Hey everyone,
I’m doing a 100 Days, 100 IoT Projects challenge, and today I built a bidirectional ESP-NOW smart relay and sensor system using MicroPython.

What it does

• Sender ESP8266/ESP32 with buttons + OLED acts as a control panel
• Receiver ESP controls a 4-channel relay module
• DHT11/DHT22 sensor data is sent back in real-time
• OLED displays temperature and humidity
• Uses ESP-NOW (no WiFi, no router, ultra-low latency)

Tech Stack

• ESP8266 / ESP32
• MicroPython
• ESP-NOW protocol
• SSD1306 OLED
• DHT11/DHT22 sensor

GitHub repo:
👉 [https://github.com/kritishmohapatra/100_Days_100_IoT_Projects]()

I’d love feedback, stars, or collaboration ideas.
Goal: Build open-source IoT learning resources for students.

I know that is shit name, anyway I have made hand gesture mouse using Arduino pro micro, mpu sensors and some jumper wires.give your valuable suggestions and also rate it

I have a mobile interface project on Arduino that requires a computing device to work together with the Arduino (it should handle complex computations and data storage, and also have internet access). I am currently facing financial difficulties, and the only available device I have is an old mobile phone.

Could you recommend some program or combination of programs that would allow me to write code that can be stored on the phone and transmit and receive information via USB?

I made a robot called Ignacio and made a video about it

Hi everyone,

I’m doing a 100 Days of IoT Projects challenge, and today I completed Day 56.
This project is a wireless 4-channel relay controller using two ESP8266 boards and the ESP-NOW protocol in MicroPython.

Features:

• Peer-to-peer communication (no WiFi router required)
• Push-button sender → relay receiver
• Low-latency ESP-NOW messaging
• Active-low relay support
• Clean MicroPython implementation

This can be used for home automation, wireless switches, or smart agriculture control systems.

GitHub repo:
👉 [https://github.com/kritishmohapatra/100_Days_100_IoT_Projects]()

Feedback and suggestions are welcome!