The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328 microcontroller.
0
votes
0answers
6 views
Arduino UNO stops working after a while
So I was looking after this problem of course, but I cannot guess what the problem can be.
I am using Arduino UNO with a matrix module and it after I upload the program it works correctly always for ...
0
votes
2answers
26 views
Why can't I declare variables inside an if statement?
I have a void function that helps me set the time on my arduino clock. I need to use the same function twice - once for the alarm and once for the actual time. The variables I am defining need to ...
3
votes
1answer
32 views
bitClear doesn't work on most significant bit
I'm currently working on a project where I read a 32 bit sequence.
The digitalPin is always HIGH when no sequence is received and starts oscilating with about 1kHz when the sequence starts (RC5).
I ...
0
votes
1answer
24 views
How to connect the 3.3v pin of arduino mega to multiple sensors
I am connecting 3 accelerometers to an arduino mega. I have everything except how to connect them to the 3.3v pin. I know that I can just connect the 3 of them to the same ground pin but I have been ...
0
votes
1answer
46 views
Why does a push button not work?
I am working on my project and a push button just won't work. I replaced the wires and buttons. It still doesn't work, so it is not the components. I use the INPUT_PULLUP on the arduino. I tried pin ...
0
votes
2answers
43 views
Why are pull-up resistors needed?
Please tell me why is it necessary to access pull-up resistors and how can we access them in arduino?
2
votes
1answer
16 views
How to Implement Simple, Quick HMAC on Arduino
Hi I am a research student working on securing the communications in Controlled Area Networks (CANs), and I am using Arduinos to simulate one of these CANs.
My goal is to use HMAC to implement ...
0
votes
1answer
28 views
Why doesn't the time update?
I am making an arduino clock/alarm. I use an LCD screen to display the time.
void loop(){
static unsigned long timing=micros();
if (mode == 0) {//mode 0 is when the time should show
...
0
votes
0answers
15 views
Murata Type ZY BLE
Previously i was using HM-11 ble module with Arduino lilypad in order to communicate Arduino and Android phone.
HM-11 was well documented and support At commands so i was able to program it really ...
0
votes
1answer
17 views
Servos Do Not Move to Specified Position
This code receives sine wave parameters from a serial connection, then formats and writes the sine wave positions to 8 servo motors.
The positions are successfully written to 6 of the 8 motors.
Of ...
-3
votes
0answers
14 views
Send Data through Wifi Module to Server [on hold]
I need to send temperature every sec to webserver
How we could do this .
PLEASE HELP ME ASAP WITH CODE PLEASE......
0
votes
1answer
13 views
How to detect the pulse width from microphone as Input?
I'm working on a project that detects the pulse width of an audio signal, which uses a microphone as an input. The user gives 2 different types of sounds one last less 0.3 seconds and other lasting ...
0
votes
1answer
19 views
Arduino Data to Cloud without shield []
I am performing basic analogue read like temperature and LDR, reading the data serially, but I would like to deploy it online to cloud platforms like (Plotly, Xively, ThingSpeak, or DataSparkFun). Is ...
0
votes
1answer
21 views
how to send large strings (> 100 characters) from arduino serial monitor
I am a newbie to arduino programming. I wish to send big strings which are in range of 100 to 1000 characters to my arduino uno. I saw that arduino cannot read more than 63 characters at a time.
The ...
0
votes
1answer
43 views
Random output on decoding time from LTC audio using arduino UNO
I am a newbie in Arduino and I am trying to decode time from ltc audio. For this I got Arduino UNO.
I got a sample code from here.. Here my code:
#define icpPin 8 // ICP input pin on arduino
...
0
votes
0answers
17 views
Serial available doesn't work right after upload
I have 2 programs to test serial communication, an simple arduino program that echoes whatever is on the serial port and a python program that writes to the serial port and prints the reply.
I'm ...
0
votes
0answers
15 views
How to increase the Sampling Rate of Arduino and Storing it to SD Card for High Speed Data Logging
I'm trying to build a Data Logger for our FSAE Car which logs both data Coming from CAN Bus of the Vehicle and from Analog Channels of the Arduino. Although I tried to log Analog Values first and ...
0
votes
0answers
15 views
Modscan Request format
I have downloaded the modbus RTu library from below link. The code seems working for me. I Need help in Modify sending request format with same library function.
Here is My part of code. I am also ...
-1
votes
0answers
5 views
Nrf24l01 some time not receive
Nrf24l01 was not properly receive I think it was due to power supply problem can any give you solution
Micro controller used:arduino uno
0
votes
2answers
20 views
How to connect two or more appliances to relay?
I was making a home automation system in which I will control a fan and a LED bulb through voice commands. I have a 2 channel relay module but don't know how to connect both the appliances to the ...
1
vote
1answer
16 views
trying to discover other nrf24 modules
Today I started messing with the idea of getting an arduino uno to autoconnect with another arduino uno using the nrf24l01 breakouts.
I dont have a particular goal in mind per se but was just wanting ...
1
vote
2answers
63 views
How can I made my Arduino follow the time exactly?
I am making an Arduino clock. You can set time to it, and then it keeps on going. The problem is that it is always within a minute off. It is not a major issue, but one that I would like to fix. I use ...
0
votes
1answer
25 views
Why does my 1602a LCD not display text with this code
#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>
#define RST_PIN 9 // Configurable, see typical pin layout above
#define ...
0
votes
0answers
28 views
Arduino does not accept code, but serial interface and MCU work
first post here ;)
My Arduino UNO R3 broke yesterday after flashing it about 15 times. I did not have anything plugged into it, I was just flashing a sketch for reading a RFID module. I did not short ...
1
vote
0answers
35 views
Serial clock for SPI
I'm trying to configure my ADC(LM98725) registers through Arduino UNO via SPI but I'm facing a small problem, it would be great if somebody help me out. I have to configure my 16 bit ADC registers ...
0
votes
1answer
26 views
Arduino Mega different SPI Pins
I am working on a project that uses Arduino and Water Level Sensor MS5540C sensor that uses SPI to communicate with Arduino.
When I use Arduino UNO, it was working like a charm using pins 11, 12 and ...
1
vote
1answer
29 views
how do you capture the top value in a fallen edge in analogs data (flex sensor)
Guys i'm working with a flex sensor and I'm trying to capture a specific value which is the moment before the user lets go of a flexed flex sensor and its represented as the top point of a falling ...
0
votes
2answers
31 views
HTTP Requests using Arduino
I use this simple HTTP Post request to post some values on my API from Arduino using Switch. each time I push the switch it send a different values to API.
void switch_led() {
bool SwitchReading = ...
0
votes
2answers
30 views
Which relay should I use to control the power from mains?
I was making a home automation project in which I want to control appliances like a fan and a bulb through voice commands with the help of an arduino uno and a relay but I am confused which relay to ...
0
votes
2answers
28 views
Thermometer project shows fluctuation due to varying sensor value and voltage
I built this thermometer that reads the sensor value from the temperature sensor and displays it on the LCD display. It basically works fine, but the displayed temperature shows a fluctuation between ...
0
votes
2answers
56 views
How can I make push buttons react to being pressed instantly?
I am making an Arduino alarm clock. I am checking for the state of a button. If it is clicked, I increment the button counter. If the counter is divisible by 2, it is mode 0, if not, it is mode 1. I ...
0
votes
0answers
9 views
Sd card initialization failed HR911105A [duplicate]
This program worked Well but after a simple modification SD card initializing failed Shown . & ethernet shield HR911105 temp. is rising . Can anyone tell me either is there any kind of software ...
0
votes
0answers
21 views
SD card initializing failed
#include <SPI.h>
#include <SD.h>
File myFile;
int sensor0,sensor1,sensor2;
int delay_time;
boolean S1,S2,S3;
void setup() {
pinMode (10,INPUT);
pinMode (11,INPUT);
pinMode ...
1
vote
1answer
30 views
avrdude: ser_open(): can't set com-state for “\\.\COM2”
I have an unofficial arduino Uno.
I've tested these :
Testing on USB 2.0 and USB 3.0
Changing Port (COM XX)
Updating drivers for the Unknown device to Arduino Uno (COM XX)
Resetting ...
3
votes
1answer
25 views
RC Car Hack Issue
I am trying to hack a cheap RC car as to be able to control it using my Arduino. I took apart the cars remote controller and found the pins that make it go forwards, backwards, left, and right. So I ...
3
votes
1answer
40 views
Why does my lcd screen work fine and then display random characters?
It works as expected for a few seconds and then random letters appear on the second row. The wiring and the programming should be correct. I wired it according to an Arduino Starter Kit Book and coded ...
1
vote
1answer
18 views
Why do I get “invalid operands of types 'const char*'” error?
I am making an Arduino alarm. This is the error:
exit status 1
invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
Here is the code that triggers it:
...
1
vote
1answer
29 views
74HC595N shift register with separate power supply
I have wired up a 74HC595N with an Uno, and the standard 8 LEDs and resistors, per the usual youtube "shift register tutorial" and written a sketch that works. For example, I wrote a routine to walk ...
1
vote
0answers
23 views
OBD2 VIN issue - Reading multiline response [on hold]
I have this AllPro OBD adapter and OBD2 simulator hooked up. And so far everything works great, except for the getting VIN.
When I run 0902\r command to get VIN number, I just get one raw as ...
0
votes
0answers
8 views
Arduino: Sending SD CSV file online at specific time of the day
I intend to perform data logging from sensors and store it on SD card as CSV format. The data is related to weather and I would like to send it at the end of the day/
Any available codes how to deploy ...
1
vote
1answer
21 views
Can I connect a remote control relay to a arduino uno board by disabling the remote control in the relay?
I was making a home automation system by making some of the appliances in the home like fans and lights voice activated. But by mistake I bought a remote controlled relay in place of a normal relay ...
0
votes
1answer
50 views
Arduino Uno - ESP 8266: sending AT commands via Code
I bought a ESP 8266 & I am able to send AT commands and receive response via serial monitor when I upload a empty sketch. I changed the baud rate from 115200 to 9600 by using AT+CIOBAUD=9600 and ...
1
vote
1answer
45 views
MG2639 CELL AND GPS LIBRARIES
I'm using a MG2639 Cell Module with the SMS and GPS functionality.
I have a sketch that sends through SMS the location of the arduino UNO.
This is my code:
#include <SoftwareSerial.h> //to ...
0
votes
2answers
24 views
I2C multi sensors reading on Arduino
I have several sensors (Grove multichannel gas sensor, Air Pressure Sensor MPX4115A, Temperature and Humidity Sensor DHT11) where most of them uses I2C communication.
I wonder if it is possible to ...
0
votes
1answer
36 views
how do I power my motor shield without an arduino uno?
I want to power my motor shield without my UNO. I have connected the +ve and -ve terminals resulting in lighting up of the LED.
Is there any way to control the motors in this arrangement from the ...
0
votes
0answers
13 views
Arduino Proteus Terminal Simulation
I am developing a simulation of an anrduino project on Proteus. And I wanted to use the terminal as if it was a GSM Modem.
I have this code somewhere.
mySerial.print("AT\r");
And when this line ...
0
votes
0answers
19 views
Proper motor for an arduino car [on hold]
I want to build an arduino car from scratch. I was wondering if you could guide me to choose the proper motors for my car. I want it to have some torque and also some speed( like a sweet combination ...
0
votes
1answer
20 views
Row-columm Scanning to control an 8x8 LED Matrix
https://www.arduino.cc/en/Tutorial/RowColumnScanning
This code really confused me because I don't know if the "pixels[x][y]" is HIGH or LOW in void refreshScreen(). As you look at the code, ...
0
votes
3answers
73 views
Why connect arduino with Rasberry pi?
I have a question about connecting a Arduino with Raspberry Pi.
What is the benefit of connecting the two?
0
votes
0answers
9 views
using a tessel RFID module with arduino uno
I have an RFID module that works with tessel based on RFID-pn532 shield from adafruit I was wondering if i could use it with my arduino uno.. here is the link for the RFID module ...
