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hardware-help

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general-help

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robotics-help

sensors-help

coding-help

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daultimateboss

8/29/2025

Hey all,

I want to make a project that uses the Mouse Library. I have seen the following in the official documentation "These core libraries allow the 32u4 and SAMD based boards (Leonardo, Esplora, Zero, Due and MKR Family) to appear as a native Mouse and/or Keyboard to a connected computer". I also see that the arduino micro is based on some 32u4 board....

еndubyu

8/29/2025

I have to bend the Arduino to get the ide to recognise it

The board is an Arduino nano every, I checked the cable and it works fine with any other device. Do I have to resolder the usb or do I send the Arduino back? Should I clean it maybe? Please help

the other guy

8/29/2025

mega heating up a bit

heya! my understanding is that arduino MEGAs can handle 9v power just fine, but im using 9v and mine's getting a bit warm in unusual places. nothing scorching but i'd just like to confirm that its not a big issue.

witherved

8/28/2025

ESP32 Upload Code Error

Hi there, i'm a beginner with microcontrollers and recently got my hands on two ESP32 boards by Elegoo. I wanted to make a wireless controller by having one ESP32 read some values from joystick modules and buttons, and send them over to the slave ESP32 to help control some computer movements. As I was working with the Master ESP32 to try and send over ESPNOW protocol, suddenly no code would upload to the ESP32. I would get two errors, either: A fatal error occurred: Write failed, the written flash region is empty. or ...

alanm

8/26/2025

motor/gear sizing/type questions

I feel like this should be simple for the qualified people here. I have a 2 inch (OD) aluminum tube with a projector screen and a tubular motor inside that works fine (for now). But the motor is old and can only be controlled via the manufacturer's RF remote. (I tried to decode the codes with an esp32 but could not get the motor to accept my codes)....

Raphouille

8/26/2025

Exit status 74

Hy !! When I upload my programm on my Arduino Giga R1 Wifi, the output tell me that is OK, but, then, it tell me an error, the error exit status 74. The message is : "Le sketch utilise 117792 octets (5%) de l'espace de stockage de programmes. Le maximum est de 1966080 octets. Les variables globales utilisent 47624 octets (9%) de mémoire dynamique, ce qui laisse 476000 octets pour les variables locales. Le maximum est de 523624 octets. dfu-util 0.10-dev...

FedericoDV

8/26/2025

Panel Solar

How can I use a solar panel as a sensor? I’m thinking of measuring the current it produces with a current sensor. Maybe it’s enough to just use analogRead to measure the voltage from the solar panel, but is there another way? My goal is to measure the intensity of solar radiation....

ItsJustCurtis

8/26/2025

Elegoo R3 Bootloader Install

I'm attempting to turn a spare Elegoo R3 I have into a rudimentary ARGB controller using the Hoodloader2 Bootloader, allowing me to use the 16u2 mcu as its own HID. After a successful attempt getting hoodloader2 burned and uploading the necessary Corsair Lighting Protocol sketches to the two MCUs, the board correctly identified as a Corsair lighting device in my PCs hardware settings and on the RGB software. On attempting to modify the sketch to add some debugging (the board wasn't sending data to my LED Strips), I'm now getting the avrdude error stk500_recv(): programmer is not responding. I followed the Hoodloader2 guidance on using the reset pins to enter bootloader mode, but to no avail, the error persists. My understanding is that this error can occur if the incorrect board is selected, however I used the same settings as described in the CLP instructions that had worked to upload the sketches prior, leading me to believe that I had potentially corrupted something. ...

sanjiva

8/26/2025

How to flash the code? Arduino IDE > ESP32 Cam

Can someone guide me on how to flash my code to esp32 cam. It doesn't have interface for me to upload my code. Im still learning about the arduino My hardware components are: ESP32 Dev Board - Node MCU ESP32 Shield Board...

Torgnoles

8/24/2025

Issues with Relay and WaterPump Project.

Hello everyone, I’m currently working on a project using an Arduino Uno to control four water pumps via six push buttons. The goal is to build a simple automatic liquid dispensing machine with four separate tanks. Button functions:...

Bilal,MK

8/22/2025

Battery issue

I’m building an obstacle-avoidance robot with Arduino. I’m using 4 Li-ion 18650 cells (3.7 V, labeled 8800 mAh) connected in a battery holder. When I connect this pack to my L298N motor driver, the two DC motors don’t run (but the L298N power LED turns on). Why might this be happening, and how can I fix it?...

FedericoDV

8/20/2025

Panel Solar on the payload for Atmosferic Baloon

Hello everyone, I am Federico Dalla Vecchia, maker and engineer. The final part of my project is to integrate a solar panel with Arduino. The goal is to measure solar radiation intensity during the day. More precisely, I want to record the raw data as voltage from the solar panel, which will be mounted on top of the payload of a high-altitude balloon. The payload will fly from the ground up to about 30 km altitude in 2–3 hours. I would like your advice on how to design the circuit....

Dog

8/20/2025

Has anyone tried using water level sensors with RO water?

Hello, I'm planning to make an automatic water stopper using solenoids and water level sensors. But the question is will it work if the RO (reverse osmosis) water is a poor conductor, it isn't that clean like distilled water, but the TDS is like 15 so there is still a chance that the sensor will show something or is it just better to buy TDS sensors that are more expensive?

HackingCheckList

8/18/2025

Touch Screen | Esp32 | Squareline studio

Hello guys, i made a design on squareline studio and wonder how i can upload this on this type of touch screen (its my first time doing this) I check online but did not found tuto for my specific model

8/18/2025

wireless barometer sensor?

I need some wireless air pressure sensors I could put inside tires, not sure where I can find anything like this im a complete noob to stuff like this......

Idiot sandwich

8/17/2025

whats the difference between pullup and pulldown

help me control a led with a button

Kama

8/16/2025

can someone help me make my MAX30100 sensor work

So I've been wiring the sensor as VIN --- 3.3V GND --- GND SCL--- A5 SDA--- A4 ...

light

8/15/2025

Connecting Arduino Mega to ESP32

Building a hydroponic gardening system and was wondering how I would be able to collect and send data from the Arduino mega through a ESP32 to a raspberry pi web server that I will be creating. Any suggestions on how I am to do this?

𝓔𝓵𝓮𝓬𝓼𝓹𝓻𝓲𝓷𝓽73

8/15/2025

Esp8266 with robotdym dimmee

Hi i want to connect my esp8266 to my dimmer, but i have a big problem. I have connect only ground with the dimmer and now i cant boot/restart the Esp and upload too from USB. I disconnect everything and nothing happened too. What can i do ? ...

Idiot sandwich

8/15/2025

How to identify which pins are electrically connected in a button

The other day, I was asking chatgpt to teach me about buttons, i couldn't understand which pins are electrically connected

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Official Arduino Discord - Discuss all things Arduino!

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