All Questions
-1
votes
0answers
4 views
Where can I get Genuino in India?
Which vendor sells genuino in India? I am looking for online/offline vendors.
I have heard that Genuino board comes with onboard sensors.
0
votes
0answers
3 views
Sending sms through GSM module sim800
I want to send an sms through my gsm module.I am using the basic GSM.h library included with the IDE. I wanted for the sms to be sent only when I receive output from my PIR sensors. I have created a ...
0
votes
1answer
9 views
Which vendors sell authentic Arduino in India?
I would like to get started with arduino. I am based in India. Unlike Raspberry Pi, Arduino counterfeits have flooded Indian and Chinese markets. Can anyone please recommend me where to buy genuine ...
3
votes
0answers
21 views
Understanding global variables on Arduino
I am rewriting a set of LED manipulation functions to be more object oriented, and I have found that, mysteriously, my global variable memory space has been over consumed, despite a reduction of the ...
0
votes
0answers
13 views
Can I do parallel processing in Arduino?
I recently got to work with Arduino and I want to get parallel input from 5 LDRs and at the same instance I need to light a LED corresponding to that LDR if the resistance got high.
I read about a ...
0
votes
0answers
13 views
Multiple MPU9250 using Multiplexer
Anybody here have tried connecting multiple MPU9250 into multiplexer. Anyway, I've used the HD74LS151 as the substitute for the 74HC4051 multiplexer. I already tried running the program and just ...
0
votes
0answers
10 views
Flashing ESP8266
So this may not be the correct place to ask this, but I can't flash my ESP8266 (ESP-01). I have 3.3v and ground connected, Rx to Tx and Tx to Rx on my usb to serial adaptor. I also have GPIO0 ...
0
votes
1answer
12 views
SPISettings was not declared in this scope
I'm trying to compile a simple I2C example to read data from an MPU-6050 accel/gyro sensor, but I'm getting the compilation error:
/usr/share/arduino/libraries/SD/src/utility/Sd2Card.cpp:27:8: error: ...
1
vote
1answer
16 views
Problem with sending DMX
I want to send DMX with my Arduino Mega 2560. I'm using the IDE 1.6.7
I tried the AVR -> DMX source code from Ulrich Radig and also the layout for the RS-485 transmission.
I modified the code to fit ...
0
votes
3answers
29 views
Arduino subtracting chars from strings
Hello I have an Arduino programme that has a string with the words hello in it.
I can add characters and other strings to the end of that one using:
String test = "hello";
test+=" jack";
it ...
1
vote
2answers
23 views
Replicating Tx and Rx LEDs
In my application all of the Arduino Uno LEDs will be invisible inside an enclosure, so I wish to provide panel-mounted Tx and Rx LEDS just replicating their on-board counterparts. Is there a way to ...
3
votes
2answers
180 views
Arduino potentiometer example: what limits the current?
I have a question regarding potentiometer example:
https://www.arduino.cc/en/Tutorial/AnalogReadSerial
If I turn the potentiometer to the marginal position and have 5V at A0 (and almost zero ...
0
votes
0answers
21 views
Arduino sending data over MAX485
To introduce myself as I'm new to this forum, I'm student from Czech and currently I'm working on a meteostation project.
I've got Arduino set up, with plenty of weather sensors, as well as WH1080 ...
0
votes
1answer
29 views
Use MOSFET to Change Voltage With PWM
Ok so forgive me for being an amateur but I'm having a situation that's driving me nuts.
I have a sensor that I have to cycle between +5VDC and +1.4VDC every 60 seconds. I'm using an ATTiny85 with ...
0
votes
1answer
24 views
Switching LED on and off using microcontroller
I am new to microcontrollers and just become confused trying to solve the following problem:
An ATmega32 chip is connected to four on/off switches (SW0-SW3) and 4 LEDs (LED0-LED3). SWi is connected ...
0
votes
2answers
16 views
Reprogram CH341A chips VID PID etc
I know it's possible (in theory) to reprogram the VID PID details back into a chip. It is however way beyond me.
Recently I learned that Microsoft distributed a piece of malicious software as part ...
2
votes
1answer
11 views
Funduino Joystick Shield with Bluetooth
I have a Funduino Joystick Shield (See here Funduino on Gearbeast store) which has some Bluetooth pins.
Does anyone know what pins they are connected to, and has anyone successfully connected to a BT ...
-1
votes
2answers
58 views
Can an a Arduino make music or speech without a speaker?
I have an Arduino Leonardo that can turn a relay off and on and the click is audible on the relay -this is simply done by making one of the control wires HIGH in the program code to turn the relay on ...
2
votes
1answer
22 views
Error when using USART with Arduino Mega 2560
I use the Arduino IDE 1.6.9
What I want is a DMX Receiver which receives 1 channel and displays it on the serial monitor. When I try to compile the code, I get the following error:
...
1
vote
1answer
33 views
generating digital positive(+5) and negative(-5) signal?
Problem in getting -5V with aurdino.
void setup() {
pinMode(13, OUTPUT);
}
void loop() {
digitalWrite(13, HIGH);
delay(20);
digitalWrite(13, LOW);
delay(20);
}
Above code is generating ...
0
votes
0answers
10 views
Connecting Arduino Due's DAC output to pc sound card with protection
I would like to connect the DAC outputs of my arduino board to my pc sound card input so that I can use my sounds card as an osciloscope.
I have two questions:
1- if I don't use an amplifier, how ...
2
votes
2answers
29 views
Use large variables without using much memory
I've wired up a dot matrix, and I display characters on the screen by using something like the example code below.
The Char_B variable is a global variable in a library used by the Arduino, and ...
0
votes
0answers
18 views
How does one build an arduino version of a slime controlled robot? [on hold]
Recently robots controlled by the emotions of biological slime have been built. See for example the New scientist article titled robot move by fear of slime mould. The hard part of building an arduino ...
1
vote
1answer
33 views
It seems my Arduino doesn't work
I've got an Arduino Uno.
I was building a simple circuit with only one switch and it doesn't seem to work (I followed the Arduino project book from the Arduino starter kit).
This is my circuit :
...
0
votes
0answers
3 views
Is it possible to read RFID card and trasmit the data to Andoird device using bluetooth transceiver without using any microcontroller? [migrated]
My aim is to read RFID card and have the data on android device using bluetooth.
Devices I am thinking of use are
1. RDM6300 RFID Module - RFID Reader
2. Bluetooth Transceiver Module
Do suggest any ...
0
votes
1answer
10 views
Arduino Mega connect to 2.1 speakers
I am new to Arduino and I want to connect it to my 2.1 speakers and later to a 5.1 surround system.
The purpose is to play some wav sounds when a button is clicked or when a trip laser is cut. What ...
0
votes
1answer
18 views
Arduino motor control using digital pins
I am new to these Arduino things, and I am currently using an Uno board for my projects.
I don't know how to control the DC motor with the help of digital pins via L293D. But I cannot use the PWM ...
0
votes
1answer
8 views
HC-SR505 PIR Sensor only outputting HIGH
I recently bought an HC-SR505 Mini PIR sensor. I connected its positive to my Arduino UNO's 5v, output to digital pin 2, and ground to ground. I used Adafruit's code to test it, but all the serial ...
0
votes
0answers
9 views
How to reset an RFID Module
so, my other post got buried, and I sort of have a different question. That is, how would I go about sending a command to the MFRC522 Module to reset it completely? I have looked over the ...
0
votes
0answers
15 views
sending midi to software using arduino [on hold]
Friends Here is what i want to ask.
I have a midi keyboard that is casio cps7. Its an old model so its not a USB midi keyboard.
I use it with a cheap midi to usb cable.
I just wanted to use my ...
5
votes
0answers
21 views
Programming many Arduinos simultaneously with a wireless broadcast
I will have many microcontroller-based devices which will be independent from each other, but all will run the same program.
I would like to upload a program to all of them at the same time with a ...
4
votes
1answer
50 views
Does a graphical driver chip exist for this project?
I need some expert advice. I'm using an Arduino Leonardo, which I have got working with a Nokia 3310 monochrome screen. I wrote some code to draw any graphics to the screen.
What I want to know is, ...
1
vote
1answer
15 views
Problem while writing sketch for GSM module sim800
I wanted to my GSM to recieve SMSs. I have written a sketch for it. But while verifying the sketch an error pops out in this part:
if (sms.available()) {
sms.remoteNumber(senderNnumber, 20);
...
1
vote
2answers
37 views
where I can find ground? [on hold]
there is AVR AVR ATmega32 and a board within.
there is outputs for all ports (A, B, C, D) on board, and Vcc.
the problem is - I have no external GND output.
to watch current - I should search for ...
1
vote
0answers
28 views
How to test Arduino behaviour on Windows? [duplicate]
Hello fellow Arduino enthusiasts,
I created an Arduino project for a Mega2560 board in Microsoft Visual Studio.
Before loading the code on the board I want to test it on my Windows desktop computer.
...
0
votes
0answers
16 views
HC-05 connecting to both pc and phone? [duplicate]
I have a HC-05 bluetooth which is a master-slave mode. So, Can I connect it to both my laptop and android phone at the same same through connecting with arduino uno. Right now, I can connect it to ...
0
votes
0answers
11 views
Save what's inside a .txt File in the SD card in a String or Char Array
I have here a program that seems to work properly.
File is Testfile.txt and the contents are:
97
123
0
123
111
and an Arduino Program:
#include <SD.h>
#include <SPI.h>
const int ...
0
votes
1answer
25 views
multiple relays not triggering correctly
quick description of the sketch: its a clap on/off relay that turns on only when it's dark.
Cannot seem to get the relays to stay off. What happens is they are off by default then when I do the ...
0
votes
1answer
48 views
Will this AC-DC converter chip really work with arduino?
I am looking for a compact solution to convert some 220V/20amp AC to something edible by our arduinos (like 5V/2amp DC). I would like to plug directly my arduino to the wall. I found many things like ...
1
vote
1answer
27 views
Analogue input 0 staying at 0 when sensing light with Arduino and a photocell
I am doing a circuit for capturing light intensities.
I followed the tutorial provided by Adil Moujahid
Yet, when I plug the jumper wires on 5V the circuit stops working and when I plug on 3.3V the ...
0
votes
1answer
21 views
Speeding up Arduino DC Motors
I am using the Adafruit Motor Shield v2.3 for Arduino Uno. I am using the analogWrite() command to power my DC motor and have set the speed to 255. Is there any way to speed up the Arduino motor even ...
0
votes
1answer
31 views
Arduino code not working
Basically its an arduino project in which i am using an analog temperature sensor ky 013. The sensor is reading the temperatures correctly but what i want is to print the temperatures showed on the ...
3
votes
1answer
40 views
How to use Arduino PID library's output to adjust the current value?
I'm trying to set up PID control with an Arduino. Just for my sample, I'm creating a PWM signal with a setpoint that's the microseconds the signal should be high for.
I'm then counting how long the ...
1
vote
3answers
83 views
Where to start?
I am totally new to Arduino and I'm a real beginner with electronics and robotics. I would like to know where to start, knowing that my ultimate goal is to build an autonomous robot (I know that I ...
1
vote
1answer
62 views
Problem Sending Colors from an Audio Visualizer to Arduino
Sorry in advance for the length of my question; I want to provide proper context. I wrote an audio visualization program in Java that (in addition to making "pretty pictures" based off of the ...
1
vote
1answer
24 views
Atmega328 PWM frequency setting not working
I have an Arduino UNO with Atmega 328 SMD, and I am trying to use PWM, but by setting registers, not using analogWrite(). My code is:
DDRD |= (1 << PORTD6); //Setting pin D6 as output
OCR0A = ...
4
votes
2answers
160 views
What's the difference between setting a variable outside a function and setting a variable inside a function?
I'm programming C++ for arduino and today I have seen an example like this
void loop() {
byte variable = 0; // << This variable is the question.
//more stuff here
}
Is the same as ...
0
votes
1answer
10 views
Arduino mini being programmed with CH340G
So, I have bought this USB programmer with CH340G chip on it, but it seems, that I cannot program arduino mini clone.
So, this programmer has pinout of 5V|GND|TX|RX|3V3.
I have connected TX to TX ...
5
votes
3answers
320 views
Why does an RGB LED between VCC and PWM work?
I'm an Arduino beginner and I recently bought a cheap starter kit on eBay. One of the lessons in the starter kit is an RGB LED controlled by 3 PWM output pins. However, the arrangement of the ...
1
vote
1answer
36 views
What is the Proper Voltage to supply an enough Current to the Arduino
I'm just confused about the supply that I should use in driving my arduino. Is it okay to use a 3.7V with a 1000mAh to supply it?
I will be using a Lilypad Arduino.
Your replies would be a big help ...
