All Questions
24,738
questions
-1
votes
2
answers
173
views
MAC address arduino
The MAC address is hardwired onto the NIC card when a device is manufactured. How is it that, we get to set a 48 bit MAC address of our choice while programming the arduino ?
Yash Singh
1
vote
1
answer
97
views
Writing new functions into progmem after main program is burned
I've been experimenting with writing very basic operating system-like programs on the Arduino, and so far I have been running user-defined programs on a small virtual machine I wrote. This has been ...
0
votes
2
answers
305
views
Timer for how long button is not pressed
I would like to timer for how long a button is not pressed. So actually if(buttonState == LOW 'for two seconds') than execute the code that comes after it. But the problem is while the user is still ...
3
votes
2
answers
851
views
How to read RPS for fast rotation with status change method in Arduino?
I'm trying to calculate the coming RPS from rotary encoder. I am trying to get it by checking the status with digitalRead. However, I can not get more than 6 RPS. Any solution? I will be obliged for ...
- 93
0
votes
1
answer
2k
views
How do I run multiple vibration motors from an Arduino Mini with PWM?
I'm building a project for my Physical Computing class that involves 4 vibration motors for varied haptic feedback based on serial input via analogRead. I have each coming out of their own pin and ...
- 11
4
votes
1
answer
3k
views
What USB to UART chip provides highest data rates with Arduino boards?
Checking out online stores for a USB/TTL adapter, I came across a wide range of products, and I'm having a hard time selecting the one which would achieve the highest data rate. I was comparing ...
- 1,278
2
votes
1
answer
2k
views
ESP8266 Nodemcu create custom PWM with 1.25us resolution
I am trying to control some SMD LEDs WS2812B with the ESP8266-Nodemcu. I am using Arduino environment for coding. Actually I am trying to accomplish a PWM that is precisely able to:
Go High for ...
- 123
1
vote
2
answers
5k
views
Use of struct and sizeof in C for Arduino
I am a newbie in C and I can not understand the point of using a structure in C. Could someone explain to me what is the point of defining a structure in C programming?
For example, this code(written ...
- 143
1
vote
1
answer
1k
views
ard-reset-arduino resetting Leonardo/Micro via USB works on OSX, fails on Ubuntu
I'm trying to program a Leonardo (actually a Micro ATmega32U4) via the command line using USB. Schematically, I'm doing ard-reset-arduino followed by a sleep 1 and an avrdude command.
This works ...
- 121
0
votes
0
answers
4k
views
How to make auto keyboard using arduino nano V3.0 ATmega 328P ?
I have an Arduino Nano v3.0 ATmega328p board. I want to make an auto keyboard that types in a string when its plugged in. I have googled and found that these chips doesn't support that feature unlike "...
- 183
1
vote
1
answer
392
views
How to run 50 IR LEDs off an Arduino UNO?
Hi I have 50 camera devices I want to program. Luckily the camera devices have a param.xml file I can import. I have already loaded the param.xml file on each of the camera devices however, now I need ...
- 143
1
vote
1
answer
1k
views
GSM shield 2 - Fully erase memory buffer
I would love to get real developers' input regarding the following issue as I've been spinning my head around it for a while now.
What I'd like to do
My program receives SMS containing simple ...
- 35
2
votes
4
answers
26k
views
ESP8266 NodeMCU first WS2812 LED lights up green
I'm trying to power some WS2812 LEDs from my ESP8266 ESP-12E NodeMCU board (circuit here). I'm simply trying to use the NeoPixel Strandtest which works perfectly on my Arduino UNO with the same LED ...
- 353
0
votes
1
answer
798
views
getHostByName always failing to find a valid ip
I'm using an arduino Uno and a CC3000 wifi shield. I installed Adafruit library in arduino to get access to Wifi network. I'm currently trying to run some samples that comes with the library. It ...
0
votes
1
answer
1k
views
How to use this Arduino code to control multiple different LEDs?
I am making an Android-controlled LED system over Bluetooth but I need to use 4 LEDs. I have done Android app but I am not able to figure out this Arduino code. Can some please help me get this done?
...
-1
votes
1
answer
474
views
What is the principle of scanner
I find a 2.4GHz scanner in this web . I want to do same thing in 433 Mhz with SI4463. But I fail to understand it's principle. Who can explain it ? Thanks.
- 123
0
votes
1
answer
2k
views
delete or free on object causes Arduino to hand or reboot
I've read a lot about dynamic allocation for strings or buffers, but that's not my case.
I plan to implement much blinkers types as classes, all inheriting from a base Action class.
I declare an ...
- 113
0
votes
1
answer
187
views
How to interpret accelerometer data to get decimals from -255 to 255
I'm using gy-521 module and I'm wondering how can i get useful readings from it so that i could work with the data that I'm receiving.
I want for AcX and AcY variable values to be from -255 to 255.
...
0
votes
2
answers
2k
views
Voltage on analog pin arduino when arduino turned off
So can I put a voltage from 0v to 5v on an analog Arduino pin before actually turning the Arduino on? And still read the analog pin correctly when turned on?
- 9
2
votes
0
answers
299
views
Opening and closing a hatch with different switches
I'm new to the whole Arduino thing and I'm not much of a programmer myself so I need some help...
The goal is to have 4 buttons which a person who operates it gives out different outputs from the ...
- 21
0
votes
1
answer
625
views
How to use potentiometer data from slave to master Arduino?
I'm trying to make a game where i can use one Arduino as a controller (the controller is a potentiometer) and the other Arduino sending the signals to the computer. Im trying to figure out ...
0
votes
1
answer
826
views
Arduino Uno: how to increase distance of serial communication to PC
Does Arduino Uno's serial communication to PC has the same distance as USB communication? (if I'm not mistaken 5m) If it is, what are the options for me to be able to communicate from Arduino Uno to ...
- 157
0
votes
2
answers
4k
views
Arduino USB Host Shield with joystick
I'm building my own quadcopter and going to use an Arduino for this. An Arduino Micro for the quadcopter and an Arduino UNO for the controller. I want to use an USB host shield with a Logitech Extreme ...
- 3
0
votes
2
answers
690
views
Interfacing IMU and GPS with Arduino
I am using an Arduino UNO board and trying to interface IMU sensor (GY-521) and GPS sensor (Ublox Neo-6M) at the same time. The connections of the IMU and GPS are as follows
IMU to Arduino:
Vcc --> ...
- 11
0
votes
1
answer
2k
views
How do I control multiple LEDs strips with Arduino
I want to decorate my house with LEDs strips on each step of my stairs.
I will buy LEDs strips with a 12V power supply.
I want that if I put my foot on the first step, the first LEDs strip turn on, ...
- 11
0
votes
2
answers
2k
views
Update custom library
I've recently made a custom library. Then, I've imported the library into the IDE via the add .zip library. Once I tried to compile the code, I've realised that I made a small typo. Once I changed the ...
- 2,913
1
vote
2
answers
963
views
Very strange power supply problem
So, I've put together my Christmas tree lights - a string of WS2811s driven by my Uno board. They are 12 volt WS2811s, so I have rigged a 12 volt supply to them and just using the Uno for the data ...
- 325
1
vote
2
answers
65
views
Getting different results from function. How to retrieve values correctly?
Trying to implement PI controller in function.
Already worked for one controller.
However, for more than one controller, the results are shifting.
Suppose to get same values in the following code.
...
- 93
1
vote
1
answer
755
views
Using an Arduino for a Diorama Controller
Kind of new to the whole DIY electronics scene.
I'm building a diorama for my son. It will include a length of track, a station, some other buildings, and scenery. It will be HO scale. The ...
- 135
2
votes
1
answer
616
views
RF24Mesh master-base node communication delay
I'm trying to build a mesh network using 4 nRF24L01 modules directly connected with Arduino Uno where 1 module is master node and the rest are base nodes.
The workflow is exactly as follows
I'm ...
- 129
0
votes
2
answers
236
views
IDE avoiding math operation
I have no idea why this has been happening:
byte potenciometro = 0;int redpin=9;
void setup() {
Serial.begin(9600);
}
void loop() {
int valor=analogRead(potenciometro); delay(50);
Serial.println(...
0
votes
2
answers
2k
views
How do I read data from Parallel port DB25 over my Arduino?
I am using this program. However, I am getting garbage values only.
Do revert as to how can I get proper values over my arduino.
/**********************************************************************...
- 69
3
votes
1
answer
96
views
Implementing interrupts and timers on an Arduino Uno board
I am trying to implement interrupts on an Arduino Uno board. My goal is to synthesize waves and play them via a 3.5 mm jack. This is what I have so far, based on some code I was provided. I have ...
2
votes
1
answer
127
views
millis() vs creating a "long" variable
I think my issue is not fully understanding how the millis() function works;
I am wondering the difference between simply creating a variable such as
long fake_millis ++ ;
vs using millis()?
- 23
2
votes
3
answers
457
views
Why do I get a compiler error when I'm pretty sure I have such method?
Code
(I've omitted much of the code, and left just the outline and code probably relating to the error.)
SelfDrivingCar.ino
#include "JKMain.h"
void setup() { JKMain::setup(); }
void loop() { ...
- 189
1
vote
1
answer
41
views
Need to turn on project twice in order for screen to work!
This problem is really stumping me. I made a simple printed circuit board with an ATtiny85, a 128x64 I2C OLED display, and a Sharp IR analog distance sensor. You can view the circuit here: circuits.io....
- 309
0
votes
1
answer
5k
views
File download from SD card hangs up my ESP-12E
I'm using ESP8266 Arduino for compiling and uploading my code to NodeMCU 1.0 (ESP-12E Module).
Flash Size: 4M (3M SPIFFS)
CPU frequency: 80 MHz
Upload Speed: 115200
I'm using portable arduino-1.6.9-...
- 435
5
votes
4
answers
5k
views
How to setup an I2C bus which stays valid if a slave is powered down or fails?
I have setup an I2C bus between 3 Arduinos (Master, Slave1 and Slave2) by connecting all 3 A4 pins together, all 3 A5 pins together and one GND pin of each Arduino to a common ground line. The 3 ...
0
votes
2
answers
725
views
What am I doing wrong with my millis()?
Im new to Arduino and have been trying to use the millis() function for an assignment of mine. I have had a lot of trouble trying to get the millis() function to work but now it seems to be working ...
- 15
0
votes
2
answers
89
views
First Serial.print voltage is wrong, way too low. Ruins average calculation [closed]
The first Serial.print voltage reading is so far off it really screws up the moving average calculation. For example, the first reading is like 0.00014981, which is wrong. From the second line on it ...
- 137
2
votes
1
answer
1k
views
wire.h multiple slave addresses
Is it possible to use wire.h on an Arduino Uno to act as a slave for more than one address? For example I'd like it to emulate two different devices, one at I2C address 23 and the other at address 57....
1
vote
2
answers
284
views
manual square wave period is off
I'm generating a square wave with my Arduino UNO using the following:
#define pin 10 // data pin to control servo
// pulse width (in microseconds)
int pulsewidth = 2500; // 400 Hz
// wave period in ...
- 113
2
votes
3
answers
938
views
wire.h onReceive only triggering once
I am writing a program to emulate a LCD driver chip (PCF8576) in a piece of equipment where I need to replace an unobtainable LCD display.
I have wire.h set up and the code in place to decode chip ...
0
votes
2
answers
2k
views
How to add Attiny13 to Attiny board profile in Arduino IDE 1.6?
Several months ago, I asked how to add (or where to get) Attiny13 to the list of boards in the Attiny package available in github: https://github.com/damellis/attiny In post 1.5 IDE, the package is ...
- 282
0
votes
1
answer
2k
views
Getting a reset error on a WEMOS D1
As a learning effort, I am trying some sample code on my WEMOS D1, which is basically an Arduino compatible board with a built-in ESP8266 (Wi-Fi module).
This is the output of my Serial Monitor:
...
- 252
0
votes
1
answer
568
views
Questions on how to connect Arduino to Matlab through the serial port
I have an Arduino board with Intel Edison on it. I have tried to read data in Arduino from MatLab through the serial port. I'm sure the Arduino board is working because when I use the serial monitor ...
- 11
1
vote
3
answers
661
views
How to make 12V flashing LEDs using an Arduino Uno?
I have 3 LEDs powered by an Arduino; each LED has its own flash rate.
Now I want it to be powered by an external 12V power source and still have the flashing function of the Arduino?
- 11
0
votes
2
answers
143
views
Most efficient method to turn a gear extremely slowly?
I have a gear that needs to have roughly one rotation per day. It does not have to be smooth or consistent. So far, the best I have come up with is to have a stepper motor with an arduino that ...
- 3
0
votes
1
answer
51
views
Arduino RGB component identification [closed]
Can someone help me identify this component?
Thanks in advance.
- 1
2
votes
1
answer
3k
views
How convert eight hex characters to uint32_t using strtol() function?
I want to control 4 pins using hexa code like this ff00ff00 (255, 0, 255, 0).
strtol() function works fine with three pins like 00ff00, but when i add two extra caracters to &payload[1] variable ...