All Questions

I'm trying to incorporate a screen into my Arduino code which is quite large already. The Adafruit SSD1306 library is overly large and has a lot of unnecessary things in it. I've found the ...

I currently have a MKR1000 which is connected to 1 ring with 8 neopixels, 1 strip with 20 neopixels, 1 microwave sensor, 1 speaker, 1 rotary encoder. I am running the NeoPixel positive and negatives ...

Sorry for novice question in Arduino, but I'm trying to figure out why res is keeping its value when up_cmd0 is being called again. for example - if num=8 in first run and the result is :up_cmd0_res: ...

I am developing a very simple project to measure some temperatures and store them in an SD card. I have a problem trying to write. No matter what I do the SD card always ends up with content like this:...

I'm working with ATmega328 NANO boards, and I would like to know if it is possible to INSERT my own routine, to be included in the things done during reset, BEFORE any pre-C initialization is done, ...

i want to connect a humidity,moisture and temperature sensor to a micro controller which controller shall i use and how?

My potentiometer reads out t's or u's in my serial. I believe that my potentiometer is wired correctly. What am I missing? Here is my code: #include <VarSpeedServo.h> VarSpeedServo servo; ...

I have six daisy chained MAX7219 connected to an Arduino nano. The thing is that all of them turn on and display the desired results but only the data on the first two is retained. The other four go ...

I am working on a project requiring very precise humidity control, preferably in 40 to 90 percent RH, for that I have been looking for a reliable andaccurate humidity sensor. I am using an Arduino ...

I am unable to set it up. I want UNO to read some sensor data -> ESP8266 should transmit this sensor data to OSX. I want ESP to act like Access Point. And read incoming changes from uno and transmit ...

I succeeded in giving an AT command. My two BL MAC addresses are 21, 13, A03B and 21, 13, A3E2. When I want to connect one to the other I use AT+BIND=21,13,A3E2. But then I see Error(7). If I use ...

I have an ebook which is converted to a .txt file saved on an sd card which is connected to the arduino. I'm trying to display the words from the book on a 16x2 lcd display on word at a time. It works ...

Here I have a small problem: I have an ESP8266, to which I have connected a matrix of LEDs to move text (the array of LEDs is made with the tape of LEDs addressable ws2812); when you turn on the ...

I need some advice regarding an Arduino setup I am currently working on. My aim: I have a set of 6 high power LEDs (http://www.roithner-laser.com/datasheets/led_highsingle/apg2c3-530.pdf) that I need ...

My Arduino Uno controls a couple LEDs in a watertight enclosure. I'm running wires from ground, a data pin and the 5V pin into the enclosure. The Arduino is powered through the DC jack. What measures ...

I want to attach a counter sensor which should work in between two flags. My code for measuring speed between two flags fixed at 30 m spacing is below: const int laserPin = 2; int laser =0; volatile ...

We're trying to make an network of connected cars in which the status of one car is continuously updated to the nearby cars (for example, speed, gear, brakes, etc.). Can I continuously send out ...

simple problem I can't see the reason behind, the sd card writes the first file fine, but the second doesn't write at all. Can any one see why? #include <SPI.h> #include <SD.h> ...

I have this code, and I have wired everything properly but the LCD is not displaying anything. Can someone help? #include<LiquidCrystal.h> LiquidCrystal lcd(13,12,11,10,9,8); #include <...

So I am programming an OLED display from my Arduino Uno. I am trying to have a button that switches the different words on the display. (The words are just placeholders for programs as of now.) My ...

First of all I want to be clear, I'm not very skilled in programming methods, all the C I learned was for various Arduino projects. That being said, I just finished a project that reads some data ...

I want to control my Arduino with USB gamepad. I know that exists library for USB keyboard for Arduino but I don't know any library for usb gamepad. I have PS3 styled gamepad. I dont want to use ...

I am designing a low-power RF application using an ATTiny (Adafruit Trinket). When the system receives a radio signal, it needs to read some sensors, and transmit with that data. Because I am short ...

I want to implement the Interrupt on the Adafruit_RGBLCDShield Select button to start/stop the data logging?

I was making a rc car with 4 dc motors, all controlled via Bluetooth. They were working fine wirelessly, but when I set them up in the car, they suddenly stopped working. I am giving commands to the ...

I am new to Arduino world!, now how to connect hc-05 module and pH sensor at a time with Arduino Uno?

I am trying to communicate Pc - Arduino Uno. My Arduino code is here: (It is working as below) int ndx = 0; char pack[12]; void setup() { Serial.begin(9600); while(!Serial){;} } void ...

I know I'm in a C++ compiler, but I typically create a typedef from structures, probably a holdover from earlier C programming. So this has my head spinning. I create a Typedef from a structure. After ...

I'm attempting to use the Adafruit BMP180 and Adafruit 16x2 RGB LCD Display together on the same Arduino Uno R1. Both the pieces of hardware and their libraries use Analog Pin 4 and 5. Is there any ...

I'm trying to make a navigational menu with sub menus to display on an OLED. Have managed this OK, however I would like to display the next item on the same level, to encourage scrolling, but I am ...

I'm using an HC-SRO4 Ultrasonic Sensor and a D10K Potentiometer. So, I was just messing around with the potentiometer in the program and then tried to change the brightness of the LED which turns on ...

I am attempting to increase the volume of a Max9744 20 watt amplifier from Adafruit using an Arduino sketch. I am just a very beginner and working with my grandson, this may be more than I am capable ...

I'm working on a project which consists of 2 different function. since the arduino only can do 1 function so i decide to use 2 arduino instead. my idea is 1st arduino will give a output and the sketch ...

Me and my classmates are trying to make an arduino base project where we will be using sensors, GSM, and Data logger shield. We want the arduino to store the data collected and at the same time send a ...

I'm rebuilding a laser CNC machine and using LaserWeb4 as the control interface and GRBL 1.1 as the low-level interface to the stepper motors, limit switches and the laser. I have all the motion ...

I have a timer interrupt that controls a stepper motor, on an UNO board. In the interrupt handler it checks the speed of the motor and compares it to the target speed. This allows the motor to ...

first post, having probs with uploading sketches on win10, blink sketch loads but when I try either of 2 sketches which have been specifically coded for this duino I get the following error: ...

On my Uno, I set up the HoodLoader2 (link below) so I can program both the ATMega16u2 and the ATmega328P. I can communicate between the two using the serial port. However, I need the serial port to ...

I am using one of the libraries from Protocentral and their ads1292r shield. I am trying to print filtered ecg data to serial monitor, but I am not sure I am getting the right values. This is the ...

I have two I2C devices connected to an Arduino Uno: an RTC and an OBD interface (see links below). The SCL/SDA of both devices connect parallel to SCL/SDA (respectively) of the Uno. My problem: when I ...

I'm buiding a project with the Arduino and Bluetooth HC-05 module that receives the MACs of Bluetooth devices around (does not connect, just inquiry). It works, but I want a better performance in ...

I am very new to Arduino. I want to add about 50 sensors to Arduino R3. I get good readings from 3 sensors, but when I connect 4th one, I get 'No devices found'. Here is a diagram: and here is the ...

When trying to upload the blink sketch to my (unofficial) Arduino Uno, I get the following error: avrdude ser_open() can't set com-state for "\\.\COM3" I have programmed this Arduino before using ...

I want to convert const char array in PROGMEM to String. How do I do this? const char charArray[] PROGMEM = "Some text";

I have bought a SD Module with the following Pin-Names: VCC,GND,MOSO,MOSI,CS,SCK. I've found many tutorials on how to use it with the Arduino Uno. But haven't found any on how to wire it with the MKR ...

I am trying to connect Arduino Mega with a gyroscope/accelerometer with 6DOF, using MPU6050 micro ship. While searhing online, I found lots of codes with more than 200 lines, to just read raw values ...

I am an engineering student completely new at using Arduino so my following question might be silly but still. I do not think you'll need to get the entire code so I am only going to expose the idea. ...

I would like to know how Arduino allocate memory for pointers in function arguments. For instance. I have this code that use 192 bytes (Arduino IDE compiler: Global variables use 192 bytes (9%) of ...

My goal is to create a function that concatenate 2 chars into 1, and return it as MQTT subscribe. I get a difference between the results inside and outside the function ( I'm new to Arduino ), and I ...

I need to connect two ESP32 or ESP8266 over internet, but they have dynamic IP. Also, using dyndns is blocked. I thought about vpn connection like hamachi but I don't know if it is possible on any of ...