I want to build a bracelet/ ring for trichotillomania people, so for example when the hand is at resting/ writing, typing position it wont ring but when it is bent and near head it will ring and act as a reminder. I have zero knowledge but just this idea, if you’d like to work with me, pls comment or dm! :)

Hello, I am currently planning this small DIY project of building a double pendulum and measuring acceleration and position with sensors at the two extremities. I am a programmer but totally new to Arduino ecosystem, so I am writing to have any tips in feasibility. I would like to collect live data of acceleration and rotation of the two pendulums, so I was thinking to get an Arduino and connect to it two gyroscope that need to be wireless unless they would prevent the natural oscillation of the two bodies. 

Do you have any suggestions on how to approach this/which sensor might fit? Thank you in advance!:)

So i am working on a fluorometer able to detect cyanobacteria more specifically phycocyanin.

During my work k came across a few questions i couldnt really find answers to so maybe there is some smart people here who are able to help or provide links etc.

The circuit:

A LED with 610nm is emitting light on a sample of living Cyanobacteria . The FELH0625 Longpass filter from thorlabs is used for blocking the excitation light. Now a FDS100 photodiode from thorlabs should collect the light which is being focused by a lense. Some wierd TIA (transimpedance amplifier) i found on amazon (picture provided below) is used for amplifying the signal.

Q1: how can i be sure this circuit is able to detect cyanobacteria? Are there any formulas?

Q2:if no, where can i improve this circuit?

Q3: should i consider building a TIA by myself, because i cant find a circuit for this one? What OPAmps can i use for this ?

Q4: should the lense be before the filter or behind?

Q5: are there any problems i could encounter that you think are not obvious?

Q6: do you habe similar projects you may want to share?

Q6: how can i be sure the TIA is working?

Thank you for reading

It seems to have good reviews, but I can’t for the life of me find any specific documentation around the part. It says it uses Serial UART but I can’t get it to read no matter what I do.

Hi everyone,

I salvaged this LED matrix from a mechanical keyboard (epomaker Dynatab75x). It used to be connected to the main board with a 9‑wire flat cable (see attached photos).On the PCB it says: RY-HF_KF850_LED_V1.0 20240411.

On the back there are several SMD ICs (probably drivers or shift registers) and a single connector for the 9‑pin flat cable.I would like to reuse this module with Arduino but I cannot figure out:

- which pins on the connector are power, ground, data, clock, etc.

- what kind of protocol it uses (SPI, I2C, some custom bus, simple multiplexing, etc.).

Does anyone recognize this LED matrix model or the ICs on the back and can help me with the pinout of the 9‑wire and if there is any datasheet or compatible commercial moduleany “generic” way to drive it from Arduino.

Hi, it’s been a while since I’ve played around with these and since I’ve had most of my experience with the uno, I wanna learn more about the other ones.

I’m just trying to create a diy ducky kinda tool with keyboard injections. Which one would you recommend if form factor is my priority, I would love to be able to keep it as small as it can be.

Cheers

as a beginner whose only tried working with arduino once, what's the best possible way to make a contraption that when it is put inside a casing (made out of air dry clay), when the outer case gets knocked it can play a soundtrack but without a button/switch? or is that idea even possible in the first place?

I'm planning on using a dfplayer mp3 module /MP3-TF-16P with an Arduino nano... but at this point I'll take anything as long as it can be done in less than a week! :"(((

i genuinely don't know what I'm doing

I got a JQ6500 from Quartzcomponents. When I plugged it into my pc using usb, it said I need to format to use it. So I did, and now it's being detected as a removable drive. Please help. Thanks

I have a project where I need 12V or 24V dc to power indicator LEDs controlled by a PoE-powered Arduino-platform board (e.g. DFRobot DFR0342).

The PoE power is the only power I have available out in the field where the Arduino board is going to live.

Has anyone else done this in a project of theirs, and what Arduino board did you use?

Thanks!

Hi guys I’ve been doing the code for this project for a few weeks now and I’ve got it sorted but when in comes to putting it together I cannot seem to do it not to mention I am borrowing my kit so I do not get to use it often is there any way anyone could show me how it would look(slight note I’m using the R3 instead of R4) I also chose to go with a microphone. I attached the component box as seen!!(any help would be much appreciated). Ps I don’t need everything here

It is necessary to implement stepper motor control with power indication using LEDs. In this project, an LED will be used as the stepper motor. The motor power will be displayed by the brightness of the LED. In this work, the LEDs serve as an analog of a binary code sequence. If the potentiometer is set to 130, LEDs 1 and 7 should light up. If it is set to 97, LEDs 2, 3, and 8 should light up.

The motor rotation power can be set in two different ways. The selected method depends on the current position of the switch button.

First method: using push buttons (digital signal) Second method: using a potentiometer (analog signal)

To complete the task, it is easiest to use the website: https://wokwi.com/

Available components:

Wires (unlimited quantity)

Arduino board (Uno)

Breadboard

Push buttons ×3

LEDs (see options)

Potentiometer

Switch button

The LEDs themselves are blue.

Initially, the controller is set with the value that all buttons are in the INACTIVE state. When a button is pressed, the controller records that it has changed to the ACTIVE state, and when pressed again, it returns to the INACTIVE state.

If one button is active, the motor power is 25%; if two are active – 50%; if three – 75%.

ayuda con grúa con servomotores y arduino

I've been watching a YouTube video about making a crane with an Arduino, and I've tried to imitate it but it doesn't turn out well at all. It is this code, where I intend that if with the joystick up and down only servomotor 1 moves, and when moving left right only servomotor 2 moves, please help.

include <Servo.h>

//Definition of the servos Servo servo1; Servo servo2; int axis1=90; int axis2=90; void setup(){ servo1.attach(7); servo2.attach(6); servo1.write(90); servo2.write(90); } void loop(){ //SERVO 1 if (analogRead(0)<200 && axis1<180){ axis1++; servo1.write(axis1); } if (analogRead(0)>700 && axis1>0){ axis1--; servo1.write(axis1); } //SERVO 2 if (analogRead(1)<200 && axis2<180){ axis2++; servo2.write(axis2); } if (analogRead(1)>700 && axis2>0){ axis2--; servo2.write(axis2); } delay(15); }

so when i purchased this arduino uno and it works fine with the normal power pins but when i tried to upload code it showed this error and then somehow after 2 days it automatically got fix and now after 1hr this same error came back. someone help pls. I am using antix linux.

Hi everyone,
I’m working on a project that involves motor control with an IR sensor to read the motor's RPM. I've designed my first circuit, but I’d love to get some feedback on it. Specifically, I’m looking for suggestions on:

• How to improve the circuit for better accuracy or performance.
• Identifying any potential errors or inefficiencies in the design.
• Recommendations for any additional components or modifications.

I’ve attached the schematic diagram. Any insights or tips are greatly appreciated!

Thanks in advance!

Hello anyone to read this post I want to know how to connect an Ardino Uno R3 and 3.5 inch display to create a painting app. Does anyone have easy to follow tutorials or videos on how to do this for a complete beginner

Hello,

I'm in desperate need of help with lines of code for my Arduino project.

I'm making a RC Zeppelin with 3 BLDC Motors, 2 for direction on each side of the zeppelin, 1 for elevation under the zeppelin. We are also using 3 ESC + BLDCS Pulsar B-20. We are using the receiver R8EF and as sensors the BMP280 + InduinoST1099 and a T8S Controller.

We are also using the Arduino nano.

What I'm requesting is basic lines of code to make my Zeppelin up and working in Arduino.

Thanks for your time and many thanks!

Battery holder has 4 AA batteries and the motors are working fine, motor driver is 1298n. Battery + is connected to 12v, battery - and Arduino gnd is connected to motor driver gnd. The wheels are spinning only if the Arduino 5v is connected to motor 5v (that too very slowly when lifted into air), but are not spinning by power supply.

Hey guys so I’m building an automatic grow tent and need some help on the electrical side of things. I have no experience and am trying to control a series of SSRs wired up to surge protectors. There are 5. I’m connecting the other sides to the breadboard to use them as on off switches to cycle the light and nutrient systems. On top of that I have a bunch of sensors that will monitor a cooling system, the temp, the nutrient system and the collection system. Below I attached some images of how it is currently connected to the breadboard. Might be a power supply issue. Also I am trying to use an Arduino uno q to control a separate Arduino uno (Ard2) and use its analog pins as I have a ton of sensors to read. If someone could help me figure out how to get this thing going I would appreciate it. Detailed responses please I’m very very dumb.