The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328 microcontroller.
0
votes
0answers
2 views
Why isn't this pushbutton program working?
Here is my circuit:
and here is my code:
int LED = 13;
int BTN = 7;
void setup() {
pinMode(LED,OUTPUT);
pinMode(BTN,INPUT);
}
void loop() {
if(digitalRead(BTN) == HIGH) {
digitalWrite(LED,LOW);
}
...
1
vote
2answers
18 views
How to convert bool array to byte?
I have following problem:
I'm reading 8 bit signal from one Arduino pin and store all informatin in bool array. Now I want to convert this array to single byte in decimal. How to do this?
I've tried ...
0
votes
0answers
14 views
servo detach function problem
This is my test code.
I used the detach() function to stop the servo, but it didn't turn.
By the way, I used the Uno board.
#include <Servo.h>
Servo servo;
int servopin =6;
void setup(){
...
0
votes
0answers
7 views
SIM808 Module's D5 LED os not lighting up
I bought a SIM808 GSM module. I followed the instructions. Powered it up with a 12v DC adapter. But whenever I click power on button, only D3 and D4 LEDs are lighting up, but not the D5 LED. I also ...
0
votes
0answers
8 views
Bluetooth Speaker to connect with Arduino
I am working on a project to use a bluetooth speaker to connect with my Arduino Uno and also make it play .wav/mp3/audio files.
Any suggestions? I want the device to be portable but legit clueless ...
0
votes
1answer
14 views
Arduino which library for led 4x20
I am having an Arduino Uno and I want to add a LCD to it. My LCD is a C2042A with I2C shield on it. I tried the LiquidCrystal_I2C library but it doesnt work. I am not getting any errors the LCD is ...
0
votes
1answer
11 views
connecting two keypad with arduino
I am pretty new to arduino.I am working on a project which requires comparison of two keypad inputs to operate a relay using arduino. I have found lot of info on connecting single keypad but none ...
1
vote
2answers
39 views
Sketches won't upload to Uno
Today I tried to update the sketch on my Arduino Uno, but was unable to due to this error:
Sketch uses 1,870 bytes (5%) of program storage space. Maximum is 32,256 bytes.
Global variables use 188 ...
0
votes
1answer
24 views
Why is one LED more luminous (brighter) than the other?
Given that there is a circuit with two pins (12 and 10) from an Uno providing power to LEDs on two separate branches, why is the yellow LED dimmer than the green LED? (Please see below image.) To my ...
0
votes
0answers
11 views
Call Rest API from ESP8266 and Arduino uno R3
I just want to make a call to any of GET API request from ESP8266 and Arduino Uno (I don't want to read any response back).
My rest functionality will be taken care by the API, because doing things ...
4
votes
2answers
192 views
interrupting an interrupt
What should be expected if the code in the timer interrupt ISR does not finish before the interrupt is called again? For example Timer0 ISR(TIMER0_COMPA_vect){} on the Uno. This is for debugging ...
0
votes
1answer
7 views
NFC 'dynamic' UID database
Hi SE (and Majenko in particular, if I'm lucky) -
I have a setup with an SD module (on SPI) and an Elechouse PN532 NFC reader (on I2C). I would like to use a master tag to enter MASTER MODE [sic] to ...
-1
votes
1answer
22 views
can i unplug my Arduino project when i'm done installing the libraries and it still work the way it did when it is plugged in
can i unplug my Arduino project when i'm done installing the libraries and it still work the way it did when it is plugged in
-1
votes
1answer
31 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?
0
votes
1answer
6 views
User-Agent question
I've seen a few different User-Agents used in demo sketches and am curious as to what the various User-Agent options are and how to determine which one to use.
For example...
User-Agent: Mozilla/...
0
votes
0answers
22 views
Setting up arduino uno without administrator rights?
If you have read my other questions you will know that arduino is giving me a hard time. i gave up on it but one day i realised that i need admin to update driver software! However, as you've probably ...
4
votes
1answer
22 views
How to connect Arduino to headphone jack?
I would like to connect a headphone jack to my Arduino and make it as an output. I mean I would simply send some simple beeps.
I know that there is a breadboard friendly headphone jack, but I don't ...
0
votes
0answers
16 views
Atmega328P and Arduino Studio and Pololu AVR - not working
I have standalone ATMega328p and I'm using external 16MHz oscillator, I hooked up and I triple checked my connections for Pololu AVR programmer and I make sure that I select a proper programmer \ ...
0
votes
0answers
5 views
Problem with format of data to be sent with ether.browseUrl
I am using MINI ENC28J60 board.
It works fine but I have problems with formating the dataCollection variable so that it can be sent with the ether.browseUrl.
I need to collect several analogReads and ...
0
votes
0answers
19 views
How do I read from HID proximity card with Arduino?
We have a RFID card reader and we have a circuit that works perfectly with 13.56 Khz and 100Khz RFID cards.
But the HID proximity cards (Like the one here, HID Proximity behave differently, and we ...
0
votes
2answers
15 views
Supplying power to arduino by 5V and 2A adapter
Can I power my Arduino using a 5V/2A adapter by connecting it through the USB port?
More precisely, I have to run a module requiring 200mA but the aim is to make the laptop independent.
0
votes
0answers
35 views
help with programming
i have used sd card module and saved two audio (0001.wav and 0002.wav).
so before a led blink, a audio should plays.
but the problem is that the audio does not play, only the leds blink
#include <...
1
vote
1answer
26 views
NodeMCU : Input pullup in A0
I am trying to port a simple project I have working in an Arduino UNO to a NodeMCU but I am stuck as I am using the analog gpio to receive the input from some buttons, I am always getting always low ...
0
votes
2answers
44 views
[Arduino UNO]Receive Serial Data from multiple sources
I have the following system:
As a master, I have an Arduino UNO Chip, more specifically an Atmel MEGA328P. The important thing is that this microcontroller has only one hardware Serial port, and ...
0
votes
1answer
21 views
Problems with running multiple ESC
I've written a program which allows me to use my Arduino Uno to send a PWM to an Electronic Speed Controller. 5 seconds after startup the ESC is sent a config via PWM to signal the low to high PWM ...
1
vote
1answer
27 views
IDE 1.6.10 on LinuxMint 17.3 Cinnamon
When compiling I get the error
'as: unknown option »-mmcu=avr5« exit status 1'
I succeeded now using your piece of advise. Thank you so much.
1
vote
2answers
74 views
A question about resistance measurement with arduino
Lately I was asking myself about the posibility of measuring a potentioneter resistance with arduino, and my questions are:
1) Is it possible?
2) if it's possible, what kind of restriction the ...
0
votes
2answers
32 views
Low memory error using SD card
I called HTTP web service on Arduino Uno, now i am trying to store the data in SD card. But as soon as i compile the program, it shows LOW MEMORY error and no data stored in SD card.
Any one can help?
0
votes
0answers
17 views
Cannot edit text using OSX editor
When I received an Arduino Uno in the post today, I used my 2012 iMac running OSX El Capitan to download and run the OSX version of the Arduino Editor. After having finding I could not edit the text, ...
0
votes
1answer
16 views
how to find find out capacitance using time constant?
i'm trying to find out the capacitance value using the time constant of the RC ciruit. so i followed the technique on the below link.
http://www.gammon.com.au/forum/?id=12075
Now, it's working fine.....
0
votes
1answer
27 views
Fastled int + float problem
I'm working on a code based on PaletteCrossfade.ino example. But i found the motion speed too fast. its stated in this:
static uint8_t startIndex = 0;
startIndex = startIndex + 1; /* motion speed ...
0
votes
2answers
50 views
Lowering delay when sending multiple SMS
I would like to use Arduino for bulk SMS sending. Right now, when I'm sending an SMS with 160 characters, I have to delay the sending of the next one for 9500 milliseconds. If I don't do that, some of ...
0
votes
1answer
16 views
Serializing data created by ATTiny85 for use on PC
Have an AES-128 implementation I'd like to install on an ATTiny85 for embedded use but need to come up with a way to communicate with it from a PC as you would do via Serial on Arduino Uno. For ...
0
votes
1answer
26 views
build simple ir sensor with 220 ohm and 1000 ohm resistors
I am brand new to the arduino board and I am trying to build a simple ir proximity sensor. I bought a handful of emitters and detectors from amazon here:
https://www.amazon.com/gp/product/B01HGIQ8NG/...
0
votes
1answer
21 views
How to convert arduino gsr value to microsiemens?
In my project Arduino provides value range between 0-1024. I need to convert this serial value to standard microsiemens value to measure emotional stress.
Can anybody point me to a answer which would ...
2
votes
2answers
51 views
How to increase voltage of Arduino?
Hey I'm very new to Arduino. I don't have very much knowledge in electrical engineering either.
My project: an EL wire working on Arduino. Since the Arduino can only support 5V and the wire needs ...
0
votes
1answer
78 views
help with arduino programming
my project involves:
1 ultrasonic sensor.
1 servo motor.
3 leds.
when a person comes in range of ultrasonic sensor (7 to 20),servo turns by 150 degree.
then ultrasonic sensor check again if the ...
0
votes
0answers
5 views
HM10 firmware v540 not able to scan all Bluetooth modules
I am using HM10 Bluetooth with firmware v540. I fired AT+DISC? in Arduino and only able to discover surrounding HM10 Bluetooth devices. i.e. not able to discover other Bluetooth devices, other than ...
1
vote
0answers
47 views
Serial Port greyed out Ubuntu 16.04
I am running Ubuntu Mate 16.04 LTS, with an Arduino Uno R3 clone. I am having the dreaded serial port graying out problem, and have not found a solution for fixing it. Currently, The serial port will ...
0
votes
0answers
24 views
Arduino PWM to control electronic toy
I am trying to control a basic childrens' electronic toy using Arduino Uno. I mean, I'd like the different sounds to be activated automatically by transistors driven by Arduino as opposed to actually ...
1
vote
2answers
21 views
How to code for cascading multiplexers?
I hope I can get some help on how to get this to work.
I have multiple Sensors (32 of these) which values I want to read. I am using a master multiplexer HC4051 connected to 4 slave multiplexers, ...
1
vote
1answer
13 views
Webserver on Arduino: How to 307 temporary redirect
I originally asked this question. Regarding a webserver Refresh issue on arduino.
I am totally new to web development and ethernet. The answer from @Majenko is correct, but I do not understand how ...
1
vote
1answer
17 views
Webserver on Arduino: Refresh issues
I am using W5100 Ethernet Shield Network Module with arduino Uno as a webserver to trigger four relays connected to it.
The relays may be toggled through the four buttons attached to it physically, ...
0
votes
1answer
11 views
Controlling an OSX app by Arduino
I am trying to control an app on OSX with an Arduino Uno. Specifically, I would like to start and stop play of an MP3 on iTunes, or a track on Spotify, using an Arduino connected to the Apple ...
0
votes
3answers
25 views
Initialize a class (HX711) within a class with constructor and parameters
I am far from being an Arduino specialist, so please bear with me if some of my code below is far from correct.
I am writing a sketch in which I need to use 3 instances of the HX711 library, as I am ...
0
votes
2answers
37 views
How to control 12v water pump by arduino?
I have arduino uno and I've bought 12 Volt/350 GPH Seaflo Electric Bilge Pump, how to control it directly from arduino?
0
votes
1answer
21 views
Arduino servo seems to time out after code runs for some amount of time
I am running a simple servo program that swings the servo back and forth, it is essentially pressing a button continuously. However, after some time the servo stops moving and it seems like the code ...
1
vote
2answers
37 views
Testing Logic Gates using Arduino
hello guys is there someone who can help me with my first project.
its basically about logic circuits.
by using tact switch and pull-up resistor to set the values to logical 1 or 0.
the output can be ...
1
vote
2answers
43 views
Programming arduino using avrdude from command prompt
Out of curiosity, I am trying to upload a simple hex file to Arduino UNO using avrdude from windows command prompt.
As per this forum, I tried to implement it. But got stuck at
avrdude: ...
0
votes
1answer
8 views
Arduino Saint Smart Chapter 7 Tri Color Module
I am very new to Arduino, I bought a starter's kit and I am working with the user manual that is available. I am in chapter 6 Tri Color Module
I am using the following code:
// Defining the LED ...
