Questions tagged [arduino-uno]

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Reducing 3A output to 500mA from DFROBOT DFR0379 buck converter [closed]

I am prototyping a system (firstly breadboarding) with a 12V 2A DC input to the DFROBOT DFR0379 buck converter with a 7V output. The issue is I need to supply 2 centrifugal fluid pumps with a max ...
CadeO01's user avatar
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0 answers
30 views

OV7670 camera module (no FIFO chip) configuration with arduino Uno R4 WIFI

a couple of days ago I bought this camera module to use for my project which also does not require a lot of resolution, since I haven't used this camera module before I did google and chat GPT. but ...
MarCoPolo's user avatar
2 votes
3 answers
887 views

What resistors for a 4 LED Arduino/breadboard project?

I am currently working on a school project for my work-study. The project is super simple: light up 4 LEDs, in various patterns, using a push button to cycle through the modes. I'm using 4 colored ...
Dio B.'s user avatar
  • 23
2 votes
1 answer
133 views

Why won't my voltage feedback system work?

Vin is a constant DC source. This circuit will take a random DC input between 12.6V and 48V, and then maintain a constant output voltage of 5V using a system of voltage feedback. with the source code,...
İbrahim İpek's user avatar
0 votes
1 answer
116 views

Why doesn't my buck converter work properly?

Such is my circuit: Vin is a constant DC source. This circuit will take a random DC input between 12.6V and 48V, and then maintain a constant output voltage of 5V. At the left bottom corner, there is ...
İbrahim İpek's user avatar
0 votes
1 answer
66 views

How do I connect two RFID readers at the same time to my Arduino?

I’m making a simple door lock for my room using an Arduino uno and an RFID sensor, I made the code to unlock the door with the correct tag, but it’s only on one side, I need a way to unlock the door ...
Computer Noob's user avatar
0 votes
2 answers
50 views

Stepper motor for wire winding step calculations

Stepper motor takes 200 steps/revolution without anything attached to the shaft. With a bobbin of 10mm in diameter and 50mm in length attached to stepper motor shaft, does it take the same 200 steps/...
Maria Stanford's user avatar
0 votes
2 answers
122 views

How can I read audio output signal (jack) with Arduino?

I am trying to find a way to connect an Arduino board to an USB sound card, equipped with 2 outputs: RCA and headphone jack 6.3mm. I would like to simoultaneously play a sound from one and record the ...
vtot's user avatar
  • 1
0 votes
2 answers
89 views

Why my 12V RGB LED strip controlled by Arduino Uno has reversed colors and when I set RGB to 0,0,0 (after reverse) strip should be black but its red?

This is scheme: Transistors: BD912, PNP, 15A, 100V, 90W, TO220. And this is color of "black": and this is code: ...
Adamoss's user avatar
0 votes
2 answers
115 views

How can I calculate the current induced in the copper coil that is wrapped around a single phase of an 11kV, 2616A distribution line?

Aim: To develop an alert system for power outages in the distribution line, informing electricians of their occurrence. Working Principal: Fuse Monitoring: The Arduino measures the status of the power ...
Ronny Alfons's user avatar
0 votes
1 answer
85 views

MOSFET trouble with Arduino

I am new to electronics. I have a MOSFET that I'm gonna use to activate a solenoid, but for now I wanted to test it with a resistor. This is my design. simulate this circuit – Schematic created ...
Epix's user avatar
  • 27
5 votes
9 answers
4k views

Can I drive a 5 V relay that requires 22 mA with an Arduino’s 20 mA continuous output?

I need to control a solenoid that requires 120 VAC to actuate. I’m powering an Arduino with a 5V power supply (directly into the 5V pin), and I want to use the Arduino to control a relay that will ...
Jake Nixon's user avatar
0 votes
0 answers
74 views

LCD Display with FPC to Arduino

I’m very new. My game is push button, but it’s important that the display is transparent. I have this LCD screen. (data sheet) I was going to connect it to my uno using this PCB. But it didn’t fit ...
Supernew's user avatar
3 votes
1 answer
215 views

Need help to understand an Arduino Capacitance-Meter program

There is a program for Arduino that without using any external component, measures value of an unknown capacitor in the range of 470pF to 18pF: https://www.circuitbasics.com/how-to-make-an-arduino-...
Meysam's user avatar
  • 73
1 vote
1 answer
138 views

How to connecting two ADXL345 (GY-291 modules) to one Arduino UNO R3 by using pin jumper?

I am having some trouble in connecting two independent ADXL345 (GY-291 modules) to my one Arduino UNO R3. Before this I tried using one ADXL345 and it works perfectly, but in my project I need to use ...
Airidz's user avatar
  • 11
0 votes
0 answers
34 views

What is the Arduino code for 433MHz RF TxRx pair connected to one Arduino UNO board to transmit "Hello" text from the transmitter to receive?

I wrote 2 codes but no one shows anything on the Serial Monitor. Please correct my code. 1ST CODE ...
Ship's Tech Talk's user avatar
0 votes
1 answer
105 views

Connecting Raspberry Pi UART to Arduino Uno

AFAIK the RPi uses 3.3 V logic and the Uno uses 5 V logic. So I need a level shifter to convert the logic levels. I have purchased a bi-directional level shifter. I want to check if I have wired it ...
Ageis's user avatar
  • 3,333
0 votes
1 answer
59 views

74HC595 used with Arduino gives high value only on first pin

I am using a 74HC595 shift register IC connected to my Arduino board as described in this tutorial to drive 8 RGB LEDs. The code is given below and is similar to the one in the tutorial: ...
Pratyush Kumar's user avatar
0 votes
2 answers
96 views

Powering Arduino from 12 V

I’m making an automatic dog feeder with an Arduino Uno as the brains and a stepper motor (taking 12 V, hence the need for the 12 V power supply) as the muscles. I want to power the whole unit from a ...
Carter's user avatar
  • 101
1 vote
1 answer
700 views

Does ESP32 Wroom-32 have internal EEPROM?

I'm working with ESP32 Wroom-32 and AHT25 temperature and humidity sensors. I need to store the temperature and humidity data using EEPROM. I don't think ESP32 has internal EEPROM. If not means how ...
Kuralmozhi's user avatar
0 votes
0 answers
18 views

Microstep driver with arduino to control DC motor

I am new to robotics and I am learning and understanding basic circuits. I am using two microstep drivers with a single Arduino to control the speed and direction of two stepper motors. Can I use ...
robie's user avatar
  • 1
0 votes
0 answers
58 views

Inverting Arduino reset signal

I'm designing a general-purpose PCB for a 8051-family MCU. I make it compatible to use shields for the Arduino Uno. There is a snag with the reset circuitry, as an Arduino is active-low reset and the ...
Joe's user avatar
  • 143
0 votes
2 answers
208 views

How to connect a 4x4 matrix keypad to one analog pin?

I watched this video on YouTube, the video's creator shows how we can connect a keypad to just one single analog pin of Arduino UNO instead of using (number of columns + number of rows) pins by using ...
M-125's user avatar
  • 53
0 votes
4 answers
118 views

How to give small voltage signal to Arduino?

I have a device which audibly says a specific line, let's say it says "received payment of $5," and the device has a speaker connected. Now I want when it says this line, my Arduino should ...
Shashank Kumar's user avatar
0 votes
0 answers
35 views

Arduino + ULN2003 + stepper motors?

I have a need to control 2 stepper motors independently and a set of three 4" fans with variable DC voltage from 0-12vdc (not pwm). I read an article about using the Arduino Uno and a ULN2003 ...
Greg_M's user avatar
  • 1
0 votes
2 answers
331 views

Understanding how the input pins on my Arduino Uno read voltage

I recently bought an Arduino starter kit which comes with an Arduino Uno and some components. I know very little about electronics or physics. The Arduino has some analog-to-digital pins on it which ...
Jack M's user avatar
  • 143
0 votes
2 answers
227 views

RS485 not working

I want to send data between different Arduinos distributed in different places: Something like this: https://forum.arduino.cc/t/arduino-master-slave-communication-using-rs485-and-modbus-protocol/...
user avatar
0 votes
1 answer
228 views

My lower side MOSFET in my half bridge SPWM inverter keeps getting shorted

I am designing a single phase SPWM inverter as a project. I am using IRF740 as MOSFETs (all N channels.) My low side MOSFET keeps getting shorted. I have checked through DSO - there is no cross ...
Ahmad Waheed's user avatar
8 votes
5 answers
2k views

MOSFET overheating in Arduino heating pad project

I am very new to electronics and working with Arduinos, I am learning a lot and would appreciate any help. I am making a heating pad system for a high-altitude weather balloon science experiment. The ...
DRAGONiaj Pax's user avatar
1 vote
0 answers
87 views

Not being able to write&read data from the 24C04N EEPROM using I2C

I have connected the 24C04N EEPROM to the ATmega328p like this - Image source - Google The only difference is I connected the ATmega328p on a breadboard using FTDI like this - Image source - This is ...
yssh's user avatar
  • 11
0 votes
2 answers
114 views

Can I capture keypad values with an analog pin?

I am building a calculator with an Arduino Uno. The thing is I ran out of pins. The switch membrane has 4 rows and 4 columns resulting in 8 pins it doesn't fit. That is why I plan to do a shift ...
Akko's user avatar
  • 3
0 votes
2 answers
189 views

How does an Arduino actually read a high signal on a pin?

I have made circuit where you can see that it is reading some signal from a button. I've found in Arduino tutorials that there should be a pull-down resistor, which I don't really understand well. I'...
Andrey Radkevich's user avatar
2 votes
1 answer
180 views

GP2Y0A21YK0F Sharp IR sensor not counting below a certain distance threshold

I'm building a self-navigating robot that uses IR sensor (GP2Y0A21YK0F model) with Arduino to navigate through a terrain, however during testing phase when I put my hand closer than 7cm it bugs and ...
melonade's user avatar
0 votes
1 answer
305 views

I need help uploading scripts to an ESP01 through an Arduino UNO

I am a beginner with Arduino. I am trying to upload any basic script from my PC to an ESP01 through an Arduino UNO and Arduino IDE. The code I am trying to upload is very basic: ...
Barth's user avatar
  • 1
7 votes
9 answers
2k views

How can I connect multiple potentiometers (~20) to my Arduino without having to have 20 analogue pins?

I'm trying to build a MIDI controller and I'm looking for a clever way of using 20 potentiometers without having to have 20 analogue ports on the Arduino. So far all the functionality I need is for ...
Michelangelo Prisciano's user avatar
1 vote
0 answers
92 views

Coding Help: Blender to Arduino over Serial Port

Working on a connecting an Arduino Uno to Blender 3.4 over the serial port. In the Blender file, I have an object named "motor1", a simple cube that can be manually rotated in the 3d ...
JakeNEPA's user avatar
0 votes
1 answer
118 views

Why is my arduino digital signal flickering on my oscilloscope display?

I have a very simple arduino program: ...
Trev347's user avatar
  • 1,032
0 votes
1 answer
66 views

Using a voltage divider to measure output of generator, and use an Arduino to measure wind speed

I am currently part of a group project in which we are required to build a turbine and generator that will turn on a light at a wind speed of 10 m/s. How will I use the fluctuating voltage out of the ...
Poorprogrammer's user avatar
1 vote
1 answer
109 views

How to properly measure a 200 A/5 A CT using an Arduino?

I've seen multiple projects for energy monitoring explaining how to calculate values using a Current Transformer (CT), however, all the CTs that were mentioned have high turn ratios. The CT available ...
user avatar
1 vote
1 answer
254 views

Is I2C clock continuous or does it depend on acknowledge from DUT?

Below is the I2C waveform obtained from my DUT. Blue is the SDA and red is the clock waveform. You can see that two acknowledgements are coming (yellow circle). After that you can see that there is no ...
Hari's user avatar
  • 2,014
1 vote
1 answer
99 views

Voltage triangulation across a copper plate for touch sensing

I'm using an Arduino Uno and am admittedly a bit out of my depth here. I'm trying to sense (very broadly) where on a copper plate a touch occurs. I'm using the voltage triangulation method found here. ...
Dan's user avatar
  • 113
0 votes
2 answers
176 views

How can we give unit step input to an Arduino Uno (for implementing PID controller)?

I am trying to implement a temperature control system in an Arduino and I also want to know relevant parameters such as settling time, overshoot, etc., so I want to give a unit step input to the ...
DSP_CS's user avatar
  • 1,267
2 votes
1 answer
85 views

Switch matrix activating more than 1 row at the same time

I'm new to electronics and I am working on a 3x3 switch matrix prototype using an Arduino UNO. I created a simple circuit using TinkerCAD but it seems that whenever I press a button, the susbequent ...
NoobxCamper's user avatar
2 votes
2 answers
789 views

Control multiple DC motors with single PWM from Arduino Uno

I don't have much knowledge of electronics, so my question might be vague. Please point out my mistakes in as simple terms as possible. I am working on a project in which I have to control multiple DC ...
JBK2's user avatar
  • 31
1 vote
1 answer
73 views

LM358DR as LMV358 replacement

So I have an Arduino Uno here that I mistakenly put 24V on the VIN pin, and as a result, the LMV358 on it popped the Magic Smoke. My question is, can I replace it with a LM358? I asked this question ...
Jotaro Joestar's user avatar
1 vote
0 answers
192 views

PID to balance a single-propeller pendulum

Dear all, I have my setup in the image which uses micro DC brushless motor instead of the 3-phase motor shown in this video, may I know what modifications should I make to the author's PID arduino ...
jessica smith's user avatar
0 votes
0 answers
60 views

Current running through drain and source on an N channel MOSFET when the Vgs has not been met

I am attempting to create an electromagnetic paper airplane launcher. I am using a hall effect sensor to detect when a sled is passing a solenoid. I am using an Arduino Uno as my microcontroller so ...
Sam Rembold's user avatar
1 vote
0 answers
143 views

What happens if you try to run code faster than your Arduino can handle?

I've been trying to program my Arduino to spin a BLDC motor. When I have this code running the BLDC motor runs perfectly every time. It also makes the motor rotate pretty fast: ...
Trev347's user avatar
  • 1,032
-1 votes
1 answer
198 views

Maximum weight for robot arm - MG996R [closed]

I want to build a robot arm (see here) to move a dumbbell of 2 kg (roughly 2.2 lbs). However, since I have no background in engineering, I have no idea how to calculate / find out if the servos used (...
juliusphysics's user avatar
1 vote
1 answer
76 views

Electric guitar output not working

So I (foolishly) decided to try and build an effects pedal of sorts for an electric guitar. I'm running it through an Arduino, and the signal is received by the Arduino just fine, although I had to ...
Sam A's user avatar
  • 11

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