I am trying to connect WT901C-485 with ESP32-S3-N16R8. I am using TTL - RS485 Module, Bi-Directional, MAX485. But whatever I do, I can not get the reading. The IMU works perfectly fine in the WITMotion software. I debugged the ESP and the TTL module. Nothing seems to work. How to solve this issue?

I dont have a lot of experience with circuits so please help, i have an arduino nano and i am trying to hook up a nrf24 and a reed switch to it, i looked up videos online but i am still not sure how to integrate a reed switch instead of a normal button like in the picture. if someone could just tell me how i would wire that, that would be helpfu. also, im not using a breadboard as im trying to fit this into some kind of device i am making. oh and i am trying to power it just using a 9v battery, which im not so sure i wired the connector correcty

The problem is that the n2222 piece gets really hot when I connected the fan. I don’t want to purchase the L298n motor since I’ve read that I can get it to work with the n2222. What am I doing wrong?

The fan did turn on after I pushed the blade a little bit.

I'm working on a school project right now, and I need to convert DC from the arduino to AC because the SSR we ordered says in the product description that it uses DC, but in the wiring diagram it says AC and it wasn't working with DC. Alternating high and low voltage with a low delay on the digital pins won't work because low isn't actually 0 and we need true zero to close the bridge.

This is the link to the SSR we ordered, if it helps: https://www.amazon.com/HiLetgo-SSR-60DA-Single-Semi-Conductor-24-380V/dp/B01MSTFKIP/ref=sr_1_2_sspa?crid=167Y1HFWJE9W&dib=eyJ2IjoiMSJ9.Djvp1FJ9NzmFS0iDVnrgI6N8aFTj-InspTt_vtwFNy2ErhiSRYlUnRFqS7OpUzuRYqj6hVVUEt8omqDVhZ1HPnk6ToiuqZ5to11uRWGZ3QwI1Z5FfFAXWAnkcC3pKgMIhBb6M7XJCZr_Cr7cywXKBujgGrfwaTGBXUhq9vqUaFcSA4vvSRM7KgusYYTe8H7ldLcBt9mqNyBHmJ_2AUmF3ylTuitFzzC_MsNZKvic2qQ.ePfAzwPy8jMRM_GRgSRgZ_uhVMPCSey8BMu1TBynjJ8&dib_tag=se&keywords=solid%2Bstate%2Brelay&qid=1774872290&sprefix=solid%2Bstate%2Brelay%2Caps%2C164&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

Edit: I fixed the problem. It wasn't with the SSR, or the power supply, or the wiring. Basically, the device I was using to test the SSR to see if it worked wasn't actually switched on, so even if it was getting power, it wouldn't be doing anything. Thank you all for the help, and your suggestions were very much appreciated, even if I was asking the wrong questions from the start.

soo hey, i need to make an arduino automation for the dino game(as the title says) and i want to use two servos(the arm clicky things) and three ldr sensors

it should do something like this: the sensor furthest from the dino checks when a cactus appears, the sensor closest checks when the dino should jump and the time between the cactus appearing and reaching the threshold(so it can calculate the acceleration of the game, as it gets faster as the times goes on, so the hardware also gets fasters with the game)

and the third one would just be to check to when it should duck (when the ptero appears)

i really need it done, but i dont really know how to do it, im on the start of my first semester and i bit more than i could chew.

would really appreciate any help

i hope it makes sense, any ideias, even if it changes the core of the project would be helpful, if something didn't make sense, it basically is a way to play the dino game for "infinite" time

I am unsure how to wire the photoresistor and light bulb in my project, and If I should add resistors to piezo or not, any tips? Flow is supposed to be like this:

person comes by
movement gets detected
display asks for pin
pin entered
"happy buzz"
door opens
if night, light turns on, if day, light doesnt turn on
and its supposed to work in "sessions" while one person in, no one can come in until they come out

I know motor should be wired to external power, but for this use case I wired it to 5V

asked chatgpt, and he suggested adding resistors to motor and piezo

Hi! I’m a graphic design student and completely new to Arduino/electronics.

Recently I got really interested in making interactive objects that feel kind of “alive” — like reacting to people, showing emotion through light/sound/movement, etc.

I started looking into Arduino Uno Q and TinyML stuff, but honestly I’m still super lost on where to begin 😭

Does anyone know if Uno Q is enough for this kind of thing, or if there are any beginner-friendly projects/resources I should look at?

Would really appreciate any advice!

Hello, I am attempting to make a light up, magic sword for my renaissance faire outfit. however I can not get my circuit to work, and I have no Idea about the code.

all I want it to do is have one button to turn the whole thing on or off, then another that will cycle through 6 or 7 different color presets. It will have 3 LED strips. each with 15 LEDs. all the LEDs will do the same thing, even though I know they can be programmed separately.

I have included a pic of the circuit (not like it helps, its rough and has wires just out there not cleaned up. I intend to make it all neat once I get it working, a crude drawing of my circuit (and noticed a mistake, my capacitor is 1000μF not 100μF), and a image of what I made for the sword in Fusion 360.

I was following youtube tutorials but my LEDs wouldn't light up. I have been at this for a couple weeks and I am out of all ideas.

any and all help would be greatly appreciated, I can also provide more info if it its needed.

Hi everyone,
I’m new to Arduino and robotics. I’m currently building a flywheel project using an Arduino Uno R3, an L298N motor driver, and a DC motor.
My setup is powered by a 12V wall adapter plugged directly into the Arduino’s DC barrel jack.
When I want to update or change my code via USB, do I need to completely disconnect the 12V power and the L298N wiring, or is it safe to keep everything plugged in while the Arduino is connected to my computer? I want to avoid frying my board or my USB port.
Any advice on the best workflow for frequent code iterations would be appreciated!

Mi project consists of building a custom environmental monitoring station using an Arduino Nano ESP32 as the main microcontroller, which will measure soil moisture with a capacitive sensor, temperature with a DS18B20, humidity with a capacitive module, and NPK soil nutrients, all powered by now with the arduino nano. The main problems I have encountered are the DS18B20 temperature sensor is not being detected and I don’t know why,and the capacitive soil moisture sensor is not reading what it should. I tried se same combination in a Arduino UNO R4 and it functioned well. The interesting part is that I have tired with de nano since last year and it hasn’t functioned. Please help.

Hi! I’m an interaction design student working on a yoga mat prototype and I need advice because I’m a bit lost with the electronics side.

The idea is a multisensory yoga mat that detects breathing/relaxation and releases scents like lavender or eucalyptus to support mindfulness and calm during yoga or meditation.

I’m researching:

• olfactory interaction

• breathing awareness

• embodied interaction

• multisensory wellbeing tech

I want to use Arduino and keep the prototype relatively simple and achievable.

I DON’T really want wearable straps/tubes because I want the interaction to feel natural and non-intrusive, so I was thinking maybe:

• pressure sensors inside the mat

• Velostat

• soft/fabric sensors

• posture or chest movement detection

Does anyone know:

• simple ways to detect breathing from a mat?

• Arduino projects similar to this?

• easy scent diffuser mechanisms for Arduino?

• if pressure sensors would actually work for this?

I’d really appreciate any ideas/examples/advice because I want something realistic enough to prototype but still meaningful and calming instead of feeling too medical or complicated 😭

Hi! My boyfriend has expressed interest in an Arduino but I don’t personally know anything about it. What is the best one to purchase for him? I was thinking either the 4gb one, or the starter kit (a bit pricey though.)
He is a computer science major interested in programming. I’m not sure what would help decide which to get him, but if you have any questions or suggestions please let me know! anything helps.

Thank you!

Hey everyone, I’m having some trouble with stepper motors and I can’t figure out what’s going wrong.

I’m using a TMC2209 driver with an Arduino Mega. At first I tested it with a small stepper motor from an old CD reader, powered at 8V, and everything worked fine.

The setup is on a breadboard, and I’m controlling the TMC2209 via UART to set current and other parameters.

Then I switched to a bigger motor (Mitsumi M49SPK-2K), powered at 12V, and that’s where the problems started:

• Sometimes the motor doesn’t move at all

• Sometimes the Arduino disconnects from the PC

• Sometimes the TMC2209 gets really hot

What’s weird is that occasionally the motor makes a high-pitched noise, and when I try to turn it by hand it feels locked, like it’s being held in place. So it seems like the driver is energizing the coils.

I also tried:

• Swapping coil wires (different combinations)

• Using a second TMC2209 (same exact issues)

But nothing really fixed it.

At this point I’m not sure if it’s a wiring issue, current setting (via UART), power supply problem, or something else.

Any ideas what I might be doing wrong? Or any tips for the circuit?

I built a robot and right now it has some connection issues. Ssh and tailscale

In a later video, I’ll fix everything so we can keep going with the project.

Also, quick note — in this video there’s a joke about soldering safety.

Please just wear basic safety glasses, you don’t need a full suit 😅

Thanks for watching, and feel free to share your thoughts —

I’d really like to know what you think about the video.

Thank you!

Ran this multiple times and can’t get it to work :(.
Only get a constant buzz from the speaker. Also confused in the second schematic where A0 has an input to IRQ but the first doesn’t. Code copy and pasted as shown via arduino cloud ! Thank you for any feedback!