Hi,

I am a University student currently in my DLD course i have a semester project but confused to decide what to make professor tells us to do something with help of Arduino so any expert can please help me

Hey everyone, I am beginner in coding and want to learn arduino can anyone suggest! Where to start?

Is it also better if i have a backup sensor using MQ9 Gas Sensor? Like a paired function along flame sensors. I'm also concern what type of buck converter should I use for various inputs like these.

I'll provide any information you need

my arduinos are both arduino uno r4 wifis, i run windows

i wantted to make something that shuts down your pc as soon as you plug it in and i made something that presses alt f4 and enter and uploaded it on my arduino. i have 2 arduinos 1 from a starter kit and one from micro center. they are bpth same r4 wifis and one is from elegoo and other is form arduino
what i will call from now on

ARDUINO 1 = elegoo non working r4 wifi

ARDUINO 2 = arduino non working r4 wifi

I uploadeed the code to my arduino 2 and it worked! it shut down my pc! and i erased the code from it. then i wanted it to work with a ir reciever so i connected arduino 1 to a ir reciever and i wrote the code. but then my pc is not reconizing the arduino 1 any more. it reconizes the arduino 2, it makes a dading sound but my arduino 1 doesnt, my device anager doesnt reconize it too. i didnt do anything to the board, and last time i did something to it it wsa working perfectly fine. teh arduino 1 has power, it runs my previous code that i uploaded on my arduino 1 (it has power) but no data is sending.

SOME ONE PLEASE HELP ME I WANT IT TO BE REVIVED ask me anything i will answer
(its my first post on reddit)

Where do I get information on error messages?

Recently i bought a tft touch display. IlI9341 2.8" hiletgo v1.2 5v/3.3v SPI specifically. I have tried with different board inc esp 32 s3 arduino nano arduino uno etc. Only the backlight works. I did try shorting the j1 pins, no luck. I did install all the necessary libraries and drivers still doesn't work. Its not a connection issue, its not a conductivity issue, its not a spi communication issue because i have used spi communication with my esp and arduinos it was working perfectly fine. Is there anyting else i should try or should i return the display

Backstory: Recently, I bought this vibrating alarm to help wake me up (I am a very heavy sleeper). I bought it, and it was super underwhelming. It cost $50 and had super low vibration strength, so I decided to make my own

Components used: .96 OLED, 3 push buttons, 5V 1A TP4056 charging board, LP603449 3.7V 1100mAh 4.1 Wh lipo battery, MT3608, 3v DC mini vibration motor 12000 rpm, DS3231 clock, TB6612 motor driver, Arduino Nano (now I'm using a uno but will use a nano in final

Problem: Currently (it's a mess), but it works (the actual project). I need help hooking up the charging unit to it. It's my first time with a LiPo battery, and I'm not sure I'm doing it right. Have I heard of needing a JST connector?

Any help or tips would be greatly appreciated! Thanks!

Hello Arduino Community,

I am facing an issue with my Arduino UNO Q (4GB version) and would appreciate your help in identifying the cause and finding a solution.

Problem Description

I flashed my Arduino UNO Q with the latest Debian Linux OS image using the official Arduino flashing procedure. After flashing, I removed the jumpers from the EDL pins and connected the board to my Windows 11 laptop. However, the board was not detected by the computer in normal mode.

I reflashed the board multiple times, trying different OS versions, but the problem persisted.

The board is detected successfully in EDL mode, and flashing completes successfully. However, once I remove the EDL jumpers and reconnect the board in normal mode, it is not detected by the computer.

OS Versions Tested

I have tried flashing the following OS image versions:

\- \`20260528-558\` — Latest version

\- \`20260407-523\` — Second-latest version

\- \`20250807-136\` — First version

\- \`20251229-457\` — Third-latest version

The issue remains the same with all four versions.

Observations

1. Board powers on normally

\- The power LED turns green.

\- The usual animation appears on the onboard LED matrix.

\- The board appears to power on normally, but it is not detected over USB.

2. Board is detected in EDL mode

When I connect the board to my Windows 11 laptop in EDL mode, it appears in Device Manager under Universal Serial Bus devices as:

\`QUSB_BULK_CID:0420_SN:51008D40\`

I can successfully flash the OS in this mode.

3. Board is not detected in normal mode

After removing the EDL jumpers and connecting the board normally:

\- Nothing appears in Windows Device Manager, including the USB-related categories.

\- The board does not appear when I check \`lsusb\` or \`dmesg\` on a Linux computer.

\- Arduino App Lab cannot detect the board through the USB connection.

Troubleshooting Already Attempted

I have tried the following steps:

1. Reflashed the board multiple times using the official flashing procedure.

2. Tested four different Debian Linux OS image versions.

3. Used multiple USB cables, including USB-A to USB-C and USB-C to USB-C cables.

4. Tested different USB ports on my Windows 11 laptop.

5. Tested the board with another computer running Linux.

6. Verified that the board is detected in EDL mode using the same cables that fail to detect it in normal mode.

7. Tested the Arduino UNO Q in Single Board Computer (SBC) mode using a USB hub. The hub works correctly with my laptop: when I connect a monitor to the hub and connect the hub to my laptop's USB-C port, the monitor works normally. However, when I use the same hub with the Arduino UNO Q in SBC mode, I am still unable to get a display output.

I have followed the official flashing procedure carefully and repeated it multiple times, but the issue remains unresolved.

Questions

I would appreciate guidance from the Arduino team on the following:

1. What could cause the board to be detected in EDL mode but not in normal mode, even though the OS flashing completes successfully?

2. Is there any additional recovery or diagnostic procedure I can try?

3. Could this indicate an issue with the USB interface, boot process, firmware, or another component of the board?

4. Is there a way to diagnose the issue further without requiring the board to be detected over USB in normal mode?

I would prefer to resolve this through software recovery or diagnostics if possible, before considering hardware repair or replacement.

Thank you for your time and assistance. Any suggestions from the Arduino team or other UNO Q users who have experienced a similar issue would be greatly appreciated.

Hi,

I'm scratching my head.
I thought it should be easy to create little project with those two component.
I not even can run a example from the Ardiuino-SSD1306 library (SSD_1306_128x64_SPI).

I connected the wires as outlined below:
Gnd --------- Gnd
VDD -------- 3.3v
SCK(D0) -- D5
SDA(D1) -- D7
Res --------- D0
DC ---------- D1
CS ---------- D2

In the code I defined the following connections:

#define OLED_MOSI   7
#define OLED_CLK    5
#define OLED_DC     1
#define OLED_CS     2
#define OLED_RESET  0

I have to mention that when I'm running this example e.g. with an Arduino Uno, is working fine.
When running other examples for the ESP-12F (w/o OLED display) they are running fine too.
I just can imagine that the wire connections between the MCU and the display causing the trouble.
Any idea what is causing the trouble and what I can do to rectify the problem?
TIA

PS. I'm running the tests in Arduino-IDE v2.3.4 on Linux.

Hey guys! We are currently developing our senior high school capstone research project called Eco-nnect. The goal of the project is to build an automated reverse vending machine that accepts plastic bottles and tin cans in exchange for Wi-Fi access/time.

Before we finalize our wiring and assembly, we’d love to get some feedback from people who have built similar embedded systems or reverse vending machines.

Here is our current component list:

Component List & Specs:

Main Controller: Orange Pi One + 16GB Sandisk Class 10 MicroSD Card

Sensors:

Plastic Detection: LJC12A3-5-Z/BX Capacitive Proximity Sensor (NPN)

Metal/Can Detection: LJ12A3-4-Z/BX Inductive Proximity Sensor (NPN)

Object Passage/Counting: E18-D80NK Adjustable IR Obstacle Sensor

Signal Isolation & Interfacing: PC817 4-Channel Optocoupler Isolation Board

Display: LCD 2004 (or 1602) Board with I2C Module

Actuator/Mechanism: MG996R High-Torque Metal Gear Servo Motor

Power Supply & Distribution:

12V 5A DC Power Adapter

LM2596 DC-DC Buck Converter (12V to 5V step-down)

Female 12V DC Barrel Jack Adapter (5.5mm x 2.1mm)

Relay: 5V 1-Channel Relay Module

Network & Cabling: CAT6 Ethernet Cable + Assorted Jumper Wires (M-M, M-F, F-F)

Question:

Sensor Logic & Logic Levels:

Both the inductive and capacitive sensors usually run on 6V–36V (we plan to power them via 12V). Since their NPN outputs will send 12V signals, we are using the PC817 Optocoupler board to safely step down the signal to 3.3V for the Orange Pi GPIO pins. Is this setup solid, or is there a better way to route this?

For the capacitive sensor (plastic), how sensitive is it in practice? Have you experienced false positives with nearby enclosure materials (e.g., acrylic or wood)?

Mechanism / Sorting:

Is a single MG996R servo sufficient for a trapdoor/sorting flap mechanism, or should we consider stepper motors or dual servos if the flap gets weighed down?

Missing / Recommended Components:

Is there anything essential we forgot (e.g., flyback diodes, extra decoupling capacitors, terminal blocks, specific fusable protection)?

Any feedback, wiring layout advice, or hardware pitfalls you encountered while doing a similar setup would be an awesome help for our team! Thanks in advance!

reposting this here

can you guys recommand "big" projects that group specific skills to learn like a project that uses MOSFETs logic gates ect and another for motors ect so that at the end i know the basics of everything

Hello Arduino Community,

I am facing an issue with my Arduino UNO Q (4GB version) and would appreciate your help in identifying the cause and finding a solution.

Problem Description

I flashed my Arduino UNO Q with the latest Debian Linux OS image using the official Arduino flashing procedure. After flashing, I removed the jumpers from the EDL pins and connected the board to my Windows 11 laptop. However, the board was not detected by the computer in normal mode.

I reflashed the board multiple times, trying different OS versions, but the problem persisted.

The board is detected successfully in EDL mode, and flashing completes successfully. However, once I remove the EDL jumpers and reconnect the board in normal mode, it is not detected by the computer.

OS Versions Tested

I have tried flashing the following OS image versions:

\- \`20260528-558\` — Latest version

\- \`20260407-523\` — Second-latest version

\- \`20250807-136\` — First version

\- \`20251229-457\` — Third-latest version

The issue remains the same with all four versions.

Observations

1. Board powers on normally

\- The power LED turns green.

\- The usual animation appears on the onboard LED matrix.

\- The board appears to power on normally, but it is not detected over USB.

2. Board is detected in EDL mode

When I connect the board to my Windows 11 laptop in EDL mode, it appears in Device Manager under Universal Serial Bus devices as:

\`QUSB_BULK_CID:0420_SN:51008D40\`

I can successfully flash the OS in this mode.

3. Board is not detected in normal mode

After removing the EDL jumpers and connecting the board normally:

\- Nothing appears in Windows Device Manager, including the USB-related categories.

\- The board does not appear when I check \`lsusb\` or \`dmesg\` on a Linux computer.

\- Arduino App Lab cannot detect the board through the USB connection.

Troubleshooting Already Attempted

I have tried the following steps:

1. Reflashed the board multiple times using the official flashing procedure.

2. Tested four different Debian Linux OS image versions.

3. Used multiple USB cables, including USB-A to USB-C and USB-C to USB-C cables.

4. Tested different USB ports on my Windows 11 laptop.

5. Tested the board with another computer running Linux.

6. Verified that the board is detected in EDL mode using the same cables that fail to detect it in normal mode.

7. Tested the Arduino UNO Q in Single Board Computer (SBC) mode using a USB hub. The hub works correctly with my laptop: when I connect a monitor to the hub and connect the hub to my laptop's USB-C port, the monitor works normally. However, when I use the same hub with the Arduino UNO Q in SBC mode, I am still unable to get a display output.

I have followed the official flashing procedure carefully and repeated it multiple times, but the issue remains unresolved.

Questions

I would appreciate guidance from the Arduino team on the following:

1. What could cause the board to be detected in EDL mode but not in normal mode, even though the OS flashing completes successfully?

2. Is there any additional recovery or diagnostic procedure I can try?

3. Could this indicate an issue with the USB interface, boot process, firmware, or another component of the board?

4. Is there a way to diagnose the issue further without requiring the board to be detected over USB in normal mode?

I would prefer to resolve this through software recovery or diagnostics if possible, before considering hardware repair or replacement.

Thank you for your time and assistance. Any suggestions from the Arduino team or other UNO Q users who have experienced a similar issue would be greatly appreciated.

Hello Community,

I am facing an issue with my Arduino UNO Q (4GB version) and would appreciate your help in identifying the cause and finding a solution.

Problem Description

I flashed my Arduino UNO Q with the latest Debian Linux OS image using the official Arduino flashing procedure. After flashing, I removed the jumpers from the EDL pins and connected the board to my Windows 11 laptop. However, the board was not detected by the computer in normal mode.

I reflashed the board multiple times, trying different OS versions, but the problem persisted.

The board is detected successfully in EDL mode, and flashing completes successfully. However, once I remove the EDL jumpers and reconnect the board in normal mode, it is not detected by the computer.

OS Versions Tested

I have tried flashing the following OS image versions:

- `20260528-558` — Latest version

- `20260407-523` — Second-latest version

- `20250807-136` — First version

- `20251229-457` — Third-latest version

The issue remains the same with all four versions.

Observations

1. Board powers on normally

- The power LED turns green.

- The usual animation appears on the onboard LED matrix.

- The board appears to power on normally, but it is not detected over USB.

2. Board is detected in EDL mode

When I connect the board to my Windows 11 laptop in EDL mode, it appears in Device Manager under Universal Serial Bus devices as:

`QUSB_BULK_CID:0420_SN:51008D40`

I can successfully flash the OS in this mode.

3. Board is not detected in normal mode

After removing the EDL jumpers and connecting the board normally:

- Nothing appears in Windows Device Manager, including the USB-related categories.

- The board does not appear when I check `lsusb` or `dmesg` on a Linux computer.

- Arduino App Lab cannot detect the board through the USB connection.

Troubleshooting Already Attempted

I have tried the following steps:

1. Reflashed the board multiple times using the official flashing procedure.

2. Tested four different Debian Linux OS image versions.

3. Used multiple USB cables, including USB-A to USB-C and USB-C to USB-C cables.

4. Tested different USB ports on my Windows 11 laptop.

5. Tested the board with another computer running Linux.

6. Verified that the board is detected in EDL mode using the same cables that fail to detect it in normal mode.

7. Tested the Arduino UNO Q in Single Board Computer (SBC) mode using a USB hub. The hub works correctly with my laptop: when I connect a monitor to the hub and connect the hub to my laptop's USB-C port, the monitor works normally. However, when I use the same hub with the Arduino UNO Q in SBC mode, I am still unable to get a display output.

I have followed the official flashing procedure carefully and repeated it multiple times, but the issue remains unresolved.

Questions

I would appreciate guidance from the Arduino team on the following:

1. What could cause the board to be detected in EDL mode but not in normal mode, even though the OS flashing completes successfully?

2. Is there any additional recovery or diagnostic procedure I can try?

3. Could this indicate an issue with the USB interface, boot process, firmware, or another component of the board?

4. Is there a way to diagnose the issue further without requiring the board to be detected over USB in normal mode?

I would prefer to resolve this through software recovery or diagnostics if possible, before considering hardware repair or replacement.

Thank you for your time and assistance. Any suggestions from the Arduino team or other UNO Q users who have experienced a similar issue would be greatly appreciated.