Questions tagged [arduino-uno]

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How do I daisy chain multiple data streams? Is there a better solution? [closed]

I am doing a school project right now but am stuck on some hardware issues. I am struggling to create a way to daisy chain a bunch of sensors to connect to my Arduino Uno. I don't want to route back a ...
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2 votes
3 answers
169 views

Arduino Uno prescaler, not measuring what I expected

I'm using the following code to set a pin high or low (each cycle.) I measure that pin with a logic analyzer. I use an Arduino Uno with 16MHz frequency. I set a timer interrupt with a prescaler of 64, ...
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  • 206
0 votes
1 answer
46 views

Level shifting a pitot tube signal to an Arduino ADC [duplicate]

I have a speed sensor (pitot tube) that operates as described in the figure below. My problem is that the resolution of the sensor is not good when read by the Arduino UNO ADC (around 2.75m/s.) My ...
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0 votes
2 answers
91 views

Arduino as a voltmeter

I need to read DC voltages between -2.5 V and 2.5 V with Arduino. I have read that an op-amp in inverting configuration (below) can be used to add a DC component. Therefore, I have thought about using ...
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0 votes
1 answer
76 views

OLED screen not working when I change code on Arduino from 128x32 to 128x64

I am having an issue with my new OLED screen (128x64). I was using the SSD1306 driver to run an OLED screen 128x32 screen without any issues with the Arduino. Then I swapped out the screen with a ...
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-2 votes
1 answer
60 views

Using an air pump for an pneumatic forearm trainer [closed]

I am attempting to create a forearm training device which looks like this (I don't know what it's called). Can I use this air pump motor with an arduino? It can provide pressure up to 100 kpa, but I ...
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-2 votes
1 answer
44 views

Solenoid valve triggering [closed]

Will a solenoid valve if kept in on condition (triggered) all day long cause it to burn itself, due to the heat it produces or for any other reason? Rating - (24V DC, 2A, normally closed, 1 inch, ...
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1 vote
2 answers
54 views

Difficulty in deciding battery requirements. I am using 64 A3144 Hall sensors connected to eight 74HC165 shift registers & 64 WS2812B LED strip

The image is just a basic representation. I am making a college chess project. I was powering all this with my laptop using an Arduino Uno. I plan to introduce a 16*2 LED display and one ISD1820 with ...
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2 votes
0 answers
50 views

Making a low-cost in situ fluorometer with Arduino

I am making a low cost in situ fluorometer with Arduino based on this paper The paper lists all the instruments required for the device, but since some of the products were outdated/hard to find, I ...
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  • 23
0 votes
3 answers
56 views

How do I know what voltage logic board I'm using (Arduino Uno and accelerometer)?

I've recently purchased an accelerometer (Adafruit ADXL345: https://thepihut.com/products/adafruit-adxl345-triple-axis-accelerometer-2g-4g-8g-16g-w-i2c-spi), and I'm working on connecting it up before ...
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2 votes
2 answers
432 views

Energy calculation using Arduino

How I can calculate accurate energy if I have power, current and voltage values? This is the code of energy calculation, the result's it's wrong so how I can fix that? I want to measure apparent ...
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1 vote
1 answer
117 views

Motor rotates well in one direction but runs slower in other with L298N and L293D [closed]

I connected two motors with an L293N driver. When I control it with my joystick, one motor works fine (Out 1 and 2 of driver). It rotates in one direction and the other very smoothly. The problem ...
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0 votes
0 answers
60 views

Analog pins showing incorrect data. Only from 0 to 255

A month ago, I connected a joystick with an Arduino Uno. VCC with Arduino 5v, GND with ground and Y axis with analog. I tried all, but the error persist with all 6. A month ago, in the serial monitor ...
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0 votes
1 answer
67 views

LED doesn't turn off as intended in sound sensor circuit

I am using a sound sensor and would like that when sound is detected by the sensor, an external LED also reacts to the sound and flickers to the sound. The connections for the LED is the positive pin ...
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0 votes
0 answers
153 views

I shorted my Arduino Uno from 5V to GND and now i think both pins are dead

So basically I shorted my Arduino Uno and I think the 5V pins and GND pins are dead (yes those are the ones I shorted) I was playing around and I did a really stupid thing, what I did is I got 2 MF ...
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0 votes
1 answer
88 views

Creating a simple address and data bus with Arduino Uno as a master using 3-state buffers and decoders

First of all, sorry if my post is too general. If you know a better place for this post please let me know. Problem I have 5 motors to be controlled independently (but not simultaneously, i.e. one ...
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  • 151
1 vote
1 answer
63 views

Switching Multiple Constant Current Regulators

I'm looking to setup a grow light system but I'm a bit of a beginner. My aim is to be able to turn on/off two series of LEDs from an Arduino Uno. At the moment I have two constant current regulators (...
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1 vote
0 answers
62 views

Running a 12V motor on 9V battery and arduino and matlab implementation

I have a DC geared motor rated at 12V and 60 rpm . It has a quadrature encoder with 700 PPR. I connected it directly to a 9V battery (almost new) and wished to measure the rpm of that motor. To find ...
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1 vote
0 answers
35 views

Connect analog sensor 12 volt to esp8266 Arduino

I need help how to connect analog fuel Level sensor 4-20mA running on 12V DC to A0 pin on esp8266, the main problem is the large difference in the voltage difference between sensor (9-20 VDC)and ...
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  • 19
0 votes
0 answers
80 views

Relay Module with Arduino Uno and K-Type Thermocouple

I am working on a project for school. The goal is to use thermocouples to measure temperatures. The measured temp will control whether or not the lightbulb is turned on. The components used will be an ...
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  • 21
1 vote
1 answer
196 views

Using a relay to turn PWM signal ON/OFF

I've been gaining understanding about using relays to control PWM signal (ON/OFF). Setup: Pixhawk generates PWM signals and sends it to motor controllers to control the 24V DC motor's speed. Goal: To ...
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2 votes
2 answers
120 views

MOSFET Switch in 120 Vac application with Arduino Uno

I am working on a project that requires an Arduino Uno to activate a safety mechanism using 120 Vac from a power supply. I have little experience in electronics and EE. I want to ask if the following ...
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  • 21
0 votes
2 answers
64 views

Debugging Arduino Sonar Project

I am making a simple Arduino based radar project. The complete details of the project can be found on YouTube. The circuit consists of an HC SR04 sensor ,a servo motor, an arduino UNO R3 connected as ...
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0 votes
0 answers
54 views

LiFi with Arduino

I am trying to learn LiFi by transferring data between two Arduino UNO boards with sample code as in link below. https://create.arduino.cc/projecthub/hamiran1997/li-fi-system-36ff5b?f=1#comments ...
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0 votes
1 answer
99 views

How to connect multiple digital sensors with single wire?

I am new to Arduino, and I have a problem that I can't solve on my own. I am trying to connect multiple PIR motion sensors with a single wire, in parallel and onto one pin on my Arduino. I am thinking ...
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  • 19
1 vote
0 answers
61 views

LED array falsely triggering Arduino pin

I have a strange issue where a limit switch is displaying as triggered the moment I turn on an LED driver with a relay. To complicate things further the issue doesn't occur 100% of the time. The ...
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-3 votes
0 answers
36 views

How to hook up ultrasonic sensor pair to arduino board? (Reposted after closing) [duplicate]

I have a pair of ultrasonic sensors, one of which is a transmitter and the other is a receiver. How do I hook them up to the Arduino board? The board is an Arduino Uno board and the sensors are ...
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-3 votes
1 answer
121 views

How to hook up discrete ultrasonic sensor pair to Arduino board?

I have a pair of ultrasonic sensors, one of which is a transmitter and the other is a receiver. How do I hook them up to the Arduino board? The board is an Arduino Uno board and the sensors are ...
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0 votes
1 answer
96 views

How many sensors can I interface with an Arduino Uno R3? [closed]

I got my final project to make, and I have a couple of questions regarding the Arduino Uno R3, as I have only worked with simulated ATMega on simulating software until now. I must mention I am not ...
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0 votes
1 answer
59 views

How can I use this LCD with Arduino?

I found my LCD somewhere from some remote control. And as I am a beginner, I would like to ask you guys how could I connect these LCD with my Arduino Uno so that I can display the numbers on this LCD.
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  • 3
0 votes
2 answers
164 views

My ESP8266-01 gets hot after connecting CH_PD to the 3.3V

I connected VCC to an Arduino's 3.3 volt and the GND to Arduino's GND. When I connect CH_PD tothe Arduino's 3.3 volt, it gets hot. While the red light is on, the blue light is on, too. On the serial ...
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0 votes
1 answer
141 views

How to achieve high speed microstepping?

I used an Arduino Uno with A4988 driver with 1/16 microstepping and tried to achive the highest speed possible. Using AccelStepper library ...
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  • 135
2 votes
2 answers
70 views

I don't know what voltage to use for my Arduino Uno

Specifications: It's a 100% Arduino pro micro Compatible Board. Chip: ATmega32u4 Board Mode: LEDNARDO R3 Operating frequency: 16MHz Working voltage: 5V Input voltage: 7-12V Digital IO port: 20 PWM ...
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0 votes
1 answer
558 views

How to setup a GT911 touch panel using Arduino? (i2c commiunication)

I have a 9 inch touch panel which has a GT911 controller and works with i2c. I should configure its registers and then read the touched points' coordinates. It has 6 pins (Vcc, GNd, INT, RST, SCA, SDA)...
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0 votes
0 answers
154 views

Help me pair with multiple Android devices using HM-10 BLE

I have a simple home automation project using an Arduino, HM-10 and relay to switch ON/OFF a connected load using an app made in Kodular (free online APP creation site.) The HM-10 BLE module is ...
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0 votes
0 answers
429 views

CAN BUS circuit using arduino and STM32 not receiving data

I tried to connect arduino uno R3 to STM32 using MCP2515 CAN bus transceiver. This was the transmitter code: ...
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3 votes
1 answer
103 views

Oxygen sensor voltage changes when machine is powered on. Interference?

I built an Arduino Uno based control panel for an altitude training machine, which connects to an oxygen sensor. The value is amplified by an instrumentation amp (INA122P) and read into the analog ...
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0 votes
1 answer
80 views

Connecting a bulb and a buzzer onto the same output of a relay

I am currently doing a project to light up a bulb and a buzzer at the same time. This circuit is an Arduino UNO which is connected to a relay to light up a bulb and the buzzer. Can a 40 watt bulb and ...
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0 votes
1 answer
53 views

Connecting two ports of arduino together

I want to implement the working of a CAN transceiver using Arduino. But the problem is - I have only one Arduino. So, I thought of sending and receiving signals using different ports of the same ...
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2 votes
1 answer
340 views

Arduino EMF detector / non-contact voltage detector

I am trying to build an EMF detector or non-contact voltage detector based on an Arduino to be used as a prop. The detected EMF value should be read from an analog input and based on the level, 1-5 ...
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-1 votes
1 answer
112 views

Can't get Arduino output to work using IRremote Arduino library

I'm trying to send an infrared signal to my LED-strip-receiver, but no code makes the LED work (light.) I have the IRremote.h Arduino library installed on version 1.18.15 and I found this example/test ...
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0 votes
0 answers
96 views

arduino uno connected with MCP2004a Lin Bus

i have Lin Bus connected with arduino uno project ,simulaton will be in proteuse but the question is I could'nt find the MCP2004a devices in proteuse to do my shematics olease some help ?
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10 votes
5 answers
2k views

Did I design my LED circuit correctly?

For my wedding I'm making some letters which I would like to provide with some LEDs. To have the full "I made this myself" experience, I gave myself a course on electrical engineering (...
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  • 203
0 votes
1 answer
283 views

Ultrasonic sensor not detecting any values when using Arduino and LabVIEW

I have connected the circuit as shown. The circuit works perfectly when I Use the Arduino ide. When I use LabVIEW, the distance from the ultrasonic sensor is always zero. The LabVIEW circuit diagram ...
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0 votes
1 answer
124 views

Arduino accidentally transmitting FM

I was trying to make an FM transmitter and, because I have no mic, I thought I could just use an Arduino (Uno) to generate some tones for testing. It turned out I never got a signal from the circuit ...
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0 votes
2 answers
335 views

How can one determine the pulse width of a servo motor?

I have recently started to fiddle with an Arduino UNO R3 kit I bought some time ago, and I got so hyped that I have decided to build a robotic arm. This robotic arm which I found on Thingiverse ...
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1 vote
0 answers
53 views

Connecting two FSRs in Series

Does anyone know if i can connect 2 FSR in series and then in parallel to a fixed resistor, creating a potential divider circuit. Given the inaccuracies and low repeatability of force reading from one ...
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1 vote
2 answers
81 views

What are the general characteristics of a faulty Arduino UNO board?

I am building an Arduino based project with DS1307 RTC clock module and storing an offset value, rarely updated though, in its EEPROM. But I am observing drift in the time as well as the offset value ...
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  • 281
1 vote
1 answer
43 views

How can i generate a negative potential/current and alternate the pin-input between positive and negative potential/current using an arduino uno?

My goal is to make the barmagnet rotate by activating two coils and use both forces at the same time with an Arduino Uno. One coil should have a positive potential or current to attract the negative ...
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  • 11
4 votes
4 answers
381 views

Output from TD100 with instrumentation amplifier not as expected

I've been having trouble with my TD100 circuit for a few days now and I cannot understand why the output isn't as I expect. This is the process: simulate this circuit – Schematic created using ...
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