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hardware-help

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project-showcase

general-help

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robotics-help

sensors-help

coding-help

hardware-help

esp-help

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Fαƈҽʅҽʂʂ Gσσɳ

5/30/2025

DHT11 Humidity sensor not reading.

I am using a keyestudio DHT11 humidity sensor. I have checked the wiring multiple times, so I think it is correct. The error that it gives me switches randomly between 16,12 and 16,16. I have attached a photo of the arduino and where the wires are connected.

Enodiá

5/23/2025

Power supply for ESP32 and hardware

Hello dear community, I am currently working on a project that I would like to present later in the showcase. However, I am currently failing due to my lack of experience in the area of power supply. Short version: I have an ESP32, a WS2812b ring with 16 LEDs, an HC-SR04 and possibly a vibration module. The whole thing comes in a housing with a USB-C socket as a connection - basically a lamp for an art project. According to my calculations, the power requirement at full load would be at least 1.4 A....

koyo

5/17/2025

Joystick buggy with ESP32

Hello. I uploaded a simple code to read joystick values to my ESP32 but the values aren’t reading the usual 0-1023 and instead are lying between 0-4095 with the values constantly fluctuating even when centered. I assume it has something to do with the hardware and connections messing with the signal but just in case I’ll show the code too

marcopyre

5/13/2025

Trying to get nrf905 to work

Hi everyone, i am trying to make my nrf905 work with an esp32s3, but i am starting to give up… I tried a lot of different ways, trying all the available libs with exemples, notions worked. for exemple the Radiohead library shows that the modules are correctly initialized, but no communication happens, even on my sdr i cant see any communication....

Maltulus42

5/9/2025

HC05 Connectivity Problems

Hello, i have a HC05 bluetooth module and whenever i'm trying to connect (on an Android) instead of a password field nothing shows up and then it doesn't connects and shows up at earlier connections. On an iOS device the HC05 doesn't even show up.

koyo

5/5/2025

Question about esp32 battery connection

So I’m planning to use a 3.7V LiPo battery to power an esp32 project. I’m confused on whether or not connecting it to the 3.3v pin is a good idea or if I should connect it to a step down converter first. Is it better to use the onboard regulator and will it even work properly or will I fry my board if I don’t use the step-down

koyo

5/4/2025

Questions about LiPo batteries

I’m making an RC car right now and I’m using 3.7V 1s LiPo batteries. I’ve become aware of the importance of a protection circuit when working with LiPos due to the dangerous discharge levels but every protection circuit I find online is a bit too big for my project which is a tiny RC car. Does anyone know of a tiny enough protection circuit I can use just so the battery discharges safely enough

Cemal

4/28/2025

L298N vs L9110

Hi, has anyone used L298N and L9110? What is the obvious difference between them? I was going to buy L298N, but since it is out of stock, I am thinking of buying L9110, but I have not completely decided despite looking at the descriptions. While the L298N has an enable pin, the L9110 does not have this pin, I wondered if the speed of the vehicle is not changed. What is the most obvious feature difference between the two?

Carillon

4/16/2025

esp8266 sketch stops working

wasn't really sure where to ask but my esp8266 has a sketch that creates a HomeKit device that controls a light strip which works fine, but then sometimes when i power it on the sketch just seems to not work and i have to reupload the sketch for it to start working again. any ideas? ...

Hayato

4/16/2025

problem with potenciometers and diy simrig

what should i do about this? a0 should be gas, a1 should be brake and a2 should be clutch, but only the a0 is working i guess and it somehow changes the value of all 3 analog ports

Cemal

4/10/2025

Servo Motor Not Working Correctly

Hi, after connecting the servo motor to VCC (5V), GND and a digital pin, I tried running an example on Arduino but it does not provide a continuous rotation. In the video you will see that it rotates a bit and then stops. I then reset it and it spins a bit and stops again. Since the power is cut off during the reset, it makes a small turn again and does not continue. I would like to clarify a bit: I know it is 180 degrees, there is no problem in the code, the default example provided by Arduino and the pins are connected correctly....

YeehawCat

4/9/2025

I need help with bootloading a atmega328p-au chip

im using a QFP32 to DIP 28 adapter since its an SMD. im using a arduino nano to bootload it.

arvincible

4/8/2025

Need help in making a faraday cage protect against 2.4/5G Hz wifi.

I am trying to make a faraday cage that shields against wifi but it is not working the slightest. The cage is made of stainless steel mesh with 4-4.5mm hole size. The bottom has aluminium foil to ensure continuity and I also grounded the cage but somehow it just does not work. Any suggestions please I am desperate

𝝅.

4/7/2025

auto plant waterer

i need help again but this time it uses a relay instead of a mosfet

Patrick

4/6/2025

Bidirectional I/O buffer

For something I am making I am going to have each I/O pin of a microcontroller controlling the gate of a transistor or MOSFET. But I also want to use those I/O pins as inputs while only connecting devices to the drain or source of each transistor. Is there a type of transistor that would allow current to flow back through the body to the gate? Or would I need some extra components to do that reliably.

Cools9

2/28/2025

Arduino nano help

I need to install a driver but the driver dosent work it's Ch340 btw so can you guys tell me a driver that u guys used

ndam500

1/6/2025

Soldering a parallel port

How do i solder a parallel port that doesn’t have sockets for a cable as pins

AnaBanana

12/18/2024

Cant Connect to Arduino Nano V3

I remember I had to do something funny to my home computer to get it to connect to my Arduino Nano V3 and that Arduino IDE would fail to upload code or Upload, but it would just keep doing the default blink code rather than the code I was uploading. I have a surface that I got so I can now code and tinker between breaks at work but Im having the same problem and I can't remember what I had to do to get it to connect and upload successfully. Its a fresh install of Windows...

Patrick

11/12/2024

Custom motor driver module

I am planning to make a high current motor driver module with IRLZ34NPBF mosfets. But I am wondering what components to add to make a nicely working system, like resistors, capacitors, and diodes. I know I need a 10k resistor for the gate to ground, and I know I need diodes from the drain to the vcc. But is there anything else I should have other than those?

2smokeguy (pls @ me if respond)

4/6/2024

what can i use to add Bluetooth and WiFi control to my arduino uno

I need something that will add WiFi and Bluetooth capabilities

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Official Arduino Discord - Discuss all things Arduino!

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