All Questions

Can Arduino handle variable variables? function getLetterCode(char input) { int letter_a = 17; int letter_b = 42; int letter_c = 50; return letter_$$input$$; //pseudocode } This is ...

I'd like to build a self-contained bicycle distancemeter similar to those now used by local police, i.e. that measure and display the distance between the bicycle handlebar's end and passing cars and ...

I made a sketch to switch on all digital and analog pins, and found out several pins did not work as expected. Note: I manually put a jumper wire from each digital and analog pin (one at a time) to a ...

I have an ESP8266 wifi module that I want to test, to use it later. I uploaded the original Espressif AT firmware "ESP8266 AT Bin V1.7.0" from: https://www.espressif.com/en/support/download/at. FTDI ...

i got an ESP32 WROOM32-OLED with a PH-Probe hooked up to it (PIN39). When i short the probe interfcace to get a PH07 reading (connecting the middle of the probe interface to ground) i get really ...

I stored "28328630" in sd card but at output i getting wrong value. on serial "5566" getting this value. #include "HX711.h" #include <Wire.h> #include <LiquidCrystal_I2C.h> #...

Firstly, I'd like to mention that I'm a beginner. This is the first time I've worked with a GPS module. The serial monitor is completely empty when I upload the following code to my circuit: #...

I am trying to create a timer that outputs the time remaining in minutes. I am using an Adafruit Circuit Playground Express. For example, if the timer is 5 minutes, then every minute it should output ...

Main idea is, save all seecret data to app.config or something else, what will included in .gotignore file. But in PlatformIO project anything not works. Does anyone have experiences storing password ...

My Arduino Nano can't get a reply from my new ENC28J60 Ethernet Shield - I can't get any library examples to work. Using the UIPEthernet lib, and running the EchoServer example with logging turned up, ...

I have the following situation. I would like to develop a bracelet prototype that identifies when a person is on the go and also issue a question to the person for that bracelet and get an ...

I am trying to make a ECG monitoring system using Arduino, GSM and ECG sensor which data should be sent to the private server in real time. Those data are then collected via Matlab on the remote ...

I want to measure very small voltage in small Range -100/+100 mv from a circuit, can Arduino-shield ACS712 (max471) do that direkt ?

How can I measure Voltage in Range -100mv to +100mv with Arduino , Is that an Arduino-shield can do that ?

I want to control 2 servo and 2 bldc with 2 joystick. It is something like , when I push joystick1 to write side it will slow down bldc2 and rotate servo1 , if I push joystick1 to left side it will ...

I have an Arduino Yun board and an Atmel ICE programmer/debugger. There are 6 pins on the Arduino Yun to connect to Atmel ICE for programming only, but I can't find the pins for debugging. Anyway to ...

I have a nested array, but I get only the correct size of the first one. I use this as a reference Arduino sizeOf int clockOn_0 [] = {19,0,0}; int clockOn_1 [] = {20,0,0}; int clockOff_0[] = {6,0,0}...

Dears, I have an logger prototype with arduino and ds3231 breadboard. My code check periodically OSF register to check if oscillator is/was stopped, as informed in datasheet. I turn on my logger, ...

My Arduino (actually an ESP32-based Adafruit HUZZAH32) is running as a wifi server. Its main job is to service GET requests from a user, and to periodically turn devices on and off based on the ...

I'm making a desk lamp out of 2x WS2811 strips (attached to the triple ports at top right of board below). The brightness of the strips is controlled by a potentiometer, and the colour by a switch. ...

I have a system that uses Arduino and some modules. The system needs 5v dc power with 3A current at maximum(The system needs 3A current for some seconds every 5 minutes and after that the current will ...

3 3 1 1 0 0 1 0 0 0 1 Question goes like - First line of input contains rows and columns of the array. Then the array is being input row wise. What could be the best way to read this in Python 3?

I am newbie and I want to build a project that contains two linear actuator that move synchronously. Two of them will lift up and down at same time. I use arduino mega and VNH5019 motor driver. I have ...

I've been unable to FTP anything using an Arduino and SIM800L. I have reduced the code as far as possible: #include <SoftwareSerial.h> //Create software serial object to communicate with ...

How upload application from Visual Studio? I can’t find upload process from standard VS in documentation https://docs.platformio.org/en/latest/ide/visualstudio.html I hate VS Code.

I'm working on a project using a NodeMCU and am quickly running out of GPIO pins. I'm trying to decide which way to go to complete it. Right now, I have the MCU connected to a MAX31856 PT100 ...

In one of my tasks in Arduino , I should read an image from Arduino and then make it brighter with Arduino and load it in screen with serial . i've searched so much but i could not find sth useful , ...

The idea is to send raw sensor data from ESP32 to PC through WIFI UDP socket and store it into CSV file using Python. As you can see from the code I am chopping 8 bytes of data into single bytes and ...

Is there a way to detect the start of the OLED screen refresh cycle (V-SYNC) on the SparkFun MicroView? There is no code for this functionality in the Arduino library; in fact it looks like the ...

I am using a 16 button keypad with the standard keys (123A...0#D). On some of the keys the alphabet is shown. On the key "0" it has "OPER" above. I am using an Arduino UNO and a NANO. Can anyone ...

I want these 2 Xbee S2C modules communicate with each other continuously. However, with my codes, they communicate just 2 or 3 times and stop. I really don't know what is the problem. My purpose is :...

In this other stack QA I'm asking about generating a pulse signal with a period ranging from 63 ms to 6.5 ms. There is a popular PWM library however it doesn't compile and also since 63 ...

I'm curious why the common Arduinos (Uno and Mega) only have a 16 MHz processor. My first guess was that this is for cost reasons--Arduino wants to sell a cheap product under $40, and the faster ...

Hello I would be needing to transmit data from one arduino to another as fast as possible? how do I achieve this? Since my application need a lot of pins (its a compact system so mega and due are not ...

Arduino: 1.8.9 (Windows 10), Board: "Adafruit Circuit Playground" C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/main.cpp:43: undefined reference to `setup' ...

I have a project that I must use a camera in it to detect the letters H, S, U in Arial font which will be printed on the wall. the robot will be walking in a maze if he found any of these letters it ...

I need an Arduino program to find the RPM of a 12V DC fan motor. I don't want to control the speed. I only want to find the speed of the motor using tacho out.

I wrote a simple loop to test the processor speed on my Arduino Uno. The numbers I'm getting are much worse than the 16MHz advertised, by a factor of ~5. Trying to figure out what I'm missing. long ...

I need to make an app that does various functions regarding IR signals (remote-like) I need to create a sub menu in order for me to access multiple functionalities. Arduino-Uno-Menu-Template I used ...

I want to have my Slave Arduino to send signal to Master after the command was made. But the Slave Arduino does not proceeds to sending the signal after doing the command. What is wrong with my code? ...

Setup: I have an Adafruit ADXL345 attached to an Adafruit feather 32u4, via I2C lines and an interrupt line. Goal: The microcontroller should be in a sleep condition when acceleration values are ...

I am currently using the arduino Uno connected with L298N(green pcb) connected to a dc motor rated 12V. I provided dedicated 12v power supply to the dc motor and the arduino board's power is supplied ...

I am building a simple circuit which monitors soil humidity in a flower pot. I was able to measure it and send it from one Arduino Nano to another Nano via FS100A transmitter and receiver and ...

I'm setting up a "Panic Button" for our Front Office. The concept is to have a master Arduino with the button and 4 other Arduinos with Strobes and/or alarms to alert the rest of the staff. The bells ...

Following MAJENKO's tutorial on sd card file optimization and data integrity, can I force the SDCard to read and write in either big-endian or little-endian? I need this in order to maintain backup ...

I just recently purchased an Arduino Uno 3 and I wanted to make an ultrasonic distance sensor that outputs the readings to a 16x2 LCD. I followed this guide: http://www.mertarduino.com/using-...

The code i make is this */ #include <SPI.h> #include <nRF24L01.h> #include <RF24.h> #include <Servo.h> #define CE_PIN 9 #define CSN_PIN 10 const uint64_t pipe = ...

So I've been playing with neoSWserial library on Arduino Nano. I've been using the example interrupt code: #include <NeoSWSerial.h> NeoSWSerial ss( 4, 3 ); volatile uint32_t newlines = 0UL; ...

Can I use an nrf24l01 (external antenna) and 2 motor drivers (l298n) to control 6 motors, 4 of which in one driver to control movement (forward/backward) 1 to steer the car and 1 for a flipper? Could ...

Who knows this Mega2560 with two Crystal Oscillators: 12 000 MHz and 16 000 MHz? What is the use of them?