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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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
53 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
339 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
231 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
106 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
53 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
1k views

How to read Output data from SPI connector using Arduino Uno?

I am having main controller circuit board that give the data such as ("HAI", "HELLO") to 5 pin SPI Connector mounted on the same board. In that 5 pin SPI connector I could connect separate circuit ...
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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
314 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
158 views

Problem With interfacing of 16 Servo MG996R with Arduino Uno

I am using 16 MG996R servo motor with PCA9685 servo driver with Arduino Uno, but the motors are not working properly. What is the best power supply/battery for my project as it worked well earlier but ...
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2answers
109 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
209 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
686 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
4k views

How to recieve NMEA data in A7 Gprs/Gsm/GPS Module

This module is special, it has two UART ports, Rx/Tx to send AT commands and another TX GPS. If I send the commands: enter code here AT+GPS=1 // OPEN GPS AT+GPSRD=1// RECIEVER GPS NMEA DATA The ...
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3answers
194 views

Nested for loop errors

Ok, I am trying to make 2 LEDs run at two different speeds. Here is the code I am using: void setup() { pinMode(13, OUTPUT); pinMode(12, OUTPUT); } for ( ; ; ) { for ( ; ; ) { ...
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1answer
180 views

Host name is unvalid

I am trying to call a web service from a server but didn't get the correct response on Serial Monitor arduino, i get the error "hostname is invalid". Below is the code along with the result: Thanks @...
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1answer
2k views

Wiring ESP-05 to Uno

I'm a beginner with Arduino, so I'm asking how to connect ESP-05 module to Arduino Uno, before I buy it. Thank you.
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1answer
4k views

Send values to a PHP page using Arduino ESP8266

I still a noob, and I'm learning Arduino. I built a PHP page to send values using GET parameters. I would like to send a specific value from Arduino to that PHP page. I bought an ESP8266, and I would ...
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1answer
1k views

Fingerprint sensor with external memory source

I am building a door lock that we will use at a local MakerSpace-club in my city, and we had this idea about building a fingerprint lock with parts compatible with Arduino. What we are aiming to do ...
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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
71 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
94 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
77 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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