Questions tagged [arduino-uno]

The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.

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Question about infrared receiver with metal shell to detect heart pulse rate?

I'm newbie to the world of arduino and environmental sensing. I have been searching for a while about how can I measure the heart pulse rate, I came through the following tutorial: Click Here I ...
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2answers
5k views

6 + 1 motors connected to an arduino uno?

Is it possible to connect 6 dc motors and 2 dc servo motors to an Arduino Uno? I intend to control the Uno with a Raspberry pi connected through USB. Assuming every motor to be bidirectional, how ...
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1answer
410 views

Why client.stop causes some significant delay to do another task in a loop?

void setup() { Serial.begin(9600); // Initialize serial communications with the PC // disable SD SPI pinMode(4, OUTPUT); digitalWrite(4, HIGH); // disable w5100 SPI ...
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1answer
307 views

Arduino Piccolo Example Script Error

So I am trying to make an audio visualizer from this tutorial listed here. So I downloaded all the files needed, and downloaded the code. But when I try to verify it, I get this Error: C:\Users\ted\...
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1answer
2k views

Why my RTC module doesn't return the right date/time?

I have a RTC module DS1307 (MR005-001.2) on my Arduino Uno. I use the Wire.h / Time.h / DS1307RTC.h libraries. The date and time returned is completely wrong ("17:18:9 2 4 2036") ... What do I do ...
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2answers
473 views

How to detect high/low signal from a DC servo motor using arduino?

I am a newbie to Arduino. What I am going to do is to change my roll to roll printer to flatbed printer. Rather using print roller, I decided to move the bed from a stepper motor.I know how to run ...
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2answers
2k views

Read data from 3 ColorPal 28380 simultaneously on Uno/Mega

I've been trying to get an Arduino (I have a Mega and Uno lying around) to read values from a small array of 3 ColorPal 20380, which individually, work as intended with some reflective material. The ...
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1answer
298 views

How to use ROHM LB202VL display (on BP-006LH-GC board) with Arduino?

I got this 8-unit, 7-segment, 2-digit display board with 24 pins and I am wondering how I can interface with this from my Arduino Uno. The board is labeled ROHM BP-006LH-GC and it has 8 units of the ...
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1answer
846 views

SPI Communication Failure

I am trying to program an AD5930 with my Arduino Mega, and I suspect that I have a software issue or a broken Mega. I am fairly new to coding Arduino's so I am hoping someone here knows better. Here ...
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1answer
559 views

How to update a text file dynamically

I have Two Arduinos, One with the help of sensors it will dynamically updates in to my server database. Other Arduino, reads the stored contents from the server database and sends sms to phones. Now, ...
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1answer
217 views

How Server request happens?

Can somebody explain the below code, like how the server understands, how the request goes to the server from the below code. if (client.connect(server, port)) { client.print("GET /abc.txt"); ...
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1answer
34 views

Bluetooth: read a user provided value and then obtain time from an Android phone

I'm new to Arduino and try to accomplish following 2 things (via Bluetooth module connected to an Android phone): read an integer value provided by user. obtain current time from the phone (the ...
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1answer
169 views

esp8266 ip address issues

I have android studio app and arduino codes they are connected to each other using esp8266 but it works only on one network when I use another network it doesn't recognise it's ip address instead it ...
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1answer
149 views

OLED shield for wemos d1 mini pro not staying on

I recently bought a wemos d1 mini pro to toy with wifi and bought a oled shield with it. I've been looking on youtube and github for software and I finally found the software and got it to load onto ...
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1answer
100 views

Uploading bootloader to ATMEGA328 P

I have a duemilanove which originally had a 168. I have some ATMEGA328 P chips and I've put one into the duemilanove. I am using a Uno as a programmer for the duemilanove. I am running Arduino 1.8....
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1answer
49 views

Motor driver not working properly in case we connect motor to it

We are making a Bluetooth controlled RC car. when we connect our motor (moderate power) to motor driver then Bluetooth module is automatically disconnected after taking initial command from Arduino ...
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1answer
4k views

Arduino NOOB - Stepper Motor + Rotary Encoder Control

I have a very basic Arduino setup : Arduino Uno Rotary encoder Nema 17 stepper motor + A4988 driver How can I control the rotation of the motor with the rotary encoder? How can I get it to make one ...
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1answer
184 views

Keeping track of the number of rotations of a stepper motor

Using the stepper.h library in Arduino IDE, how can we control the number of rotations the motor has to move?
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1answer
169 views

LED color for outdoor project

I am creating an arduino project that will display the value of a sensor in an LED array. Because the device is to be deployed outdoors, I wonder if there is a better color for the LEDs to be visible ...
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2answers
2k views

Nema 17, Arduino Uno and stepper motor drive ~2H42B

I tried running Nema 17 stepper motor using the drive in the pic below (not the basic L298N drive, which BTW I successfully used to rotate the motor) . Could any of you review my existing connections ...
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1answer
302 views

Generate 40 kHz then stop it

I'm currently working on my thesis right now. It aims to determine the distance measurement using ultrasonic sensors. My transmitter works on a 40 kHz frequency. I want to generate 40 kHz waves ...
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1answer
49 views

How can I control Servo motor properly by using TimerOne and ServoTimer2 Library?

In this project I want smooth rotation of the Servo(Pin (D10) periodically where period time select by a potentiometer(actually I will use pressure sensor in this pin now it is unavailable to me so I ...
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1answer
105 views

Can I connect a Android phone fingerprint scanner to Arduino or a raspberry pi?

I got it from my old phone (redmi 3s prime) and was wondering if I could connect it to an Arduino or a raspberry pi ,since I don't know what type of communication protocol it uses.
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1answer
31 views

L298N Motor Driver - Code issuing “expected primary-expression before '=' token”

Programming Questions / L298N Driver - Code Issuing - " expected primary-expression before '=' token" Today at 07:20 pm Hello Arduino Community, Code is shown at bottom - please read below I've been ...
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2answers
93 views

How to read distance of passing object?

Ok, guys this is my first post and I am new to Arduino but somewhat familiar with programming so I hope you guys can assist me. If any of this is confusing, I apologize in advance! :) I want to be ...
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1answer
149 views

Write and read problem while interfacing 93LC46B EEPROM through SPI

I try to save and read data from 93LC46B EEPROM using SPI with Arduino UNO. I'm following this article https://www.arduino.cc/en/Tutorial/SPIEEPROM . So far I have correctly connected EEPROM pinout (...
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1answer
557 views

How we can Create the folder into SD card and gives the path for file to save the data into the folder

I am trying to store files inside a series of folders, depending on month and year. I am using a RTC, and the standard SD library. I have previously gotten the program to set the file name to the ...
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1answer
623 views

Unable to analogWrite to MOSFET properly (IRLB3034)

I've got a 5 meter LED strip connected to a breadboard as such 12V Supply (+) -> (+) on breadboard rail (-) -> ground on breadboard rail Arduino (Wemos D1, all pins w/ PWM) pin7 -> gate(1st ...
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4answers
294 views

What project design tools are available?

What do you guys use for project designing? I just found out about AutoDesk's 123D Circuits, which is nice but I wonder if there is something with more components, tools, etc? For example, I can add ...
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1answer
579 views

Relay activation

I am posting my simple code here, I wanted to print the Output_Current Inspite when delay function called.Below is my code. #include <MsTimer2.h> int Analog_Pin=5; int newaverage; float ...
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1answer
2k views

hx711 and load cell read out 0 for calibration

I'm using this tutorial from Sparkfun https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide And using THEIR code. The only difference is I added a delay so it wouldn't ...
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1answer
11k views

ARDUINO UNO+SIM808(GPS/GSM) SYNCHRONISATION

I started a project quite recently where I intend to combine the Arduino Uno and the sim808 module which has gps/gsm/gprs all together in one. The GPS functionality works fine. Just the GSM both ...
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1answer
1k views

OLED display wrong (using SPI )

I can't figure out where I doing wrong https://www.youtube.com/watch?v=35NqOANmgUE This is my question in videos The both of two connect the same pin (so the right display result is the correct ...
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1answer
68 views

Arduino uno not writing to file

I'd like the arduino to write to a file whenever an ajax call is made. The ajax works, but it doesn't write to the file. All other code inside the ajax handler does execute. void handle_ajax() { ...
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3answers
88 views

How can I change the loop() procedure code?

This is the code that I started with for blinking an LED. int redPin = 12; // Red LED connected to digital pin 12 int greenPin = 11; // Green LED connected to digital ...
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1answer
59 views

what is wrong with this code? It doesn't work

#include <DS1302.h> #include <Servo.h> Time t; Servo myservo; int Hour; int Min; int Sec; // Init the DS1302 DS1302 rtc(2, 3, 4); void setup() { myservo.attach(9); myservo.write(45); // ...

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