All Questions

I'm new to arduino programming, and I want to learn programming without using any libraries. But did not find much resources to learn, so what I have decided is learn from the library source code. I ...

Hi im making fare meter for our school project. I have too many lcd.print code This code is not finish yet my only concern is how to minimize the usage of lcd.print i think its the one that makes my ...

In a project powered by batteries, the ESP8266 should go to deep sleep for long time, having RF disabled. After some number of sleep cycles, it shall restart with RF enabled, synchronize time via NTP, ...

So I've got an Arducam OV2640 which takes a picture as a JPEG that I'd like to send to another Arduino using a pair of nRF24L01 wireless transceivers to eventually display it on an SSD1351 OLED. ...

int MyNumber; String msg= "What is your favorite number? "; String msg2= "Haha, Nice! "; String msg3= " I SAID, WHAT IS YOUR FAVORITE NUMBER! "; void setup() { // put ...

I have a strange problem with the MAX31865 and the PT100. Every time when I start the system it shows that the temperature is -242 and the RTD value is 0 and so on. But When the system is in the loop()...

I am currently using an RTC module and a Dissolved Oxygen Sensor. Data is stored in a csv file and I want to find the 3rd row's min and max, but print all the rows including the time. void data() { ...

I am making a temperature sensor that can go in a freezer and I am trying to figure out what the best method is. My research has taken me all over the place an I can't seem to find a straight answer. ...

I have a Seeeduino V4.0, a DFPlayer, a YD103-04B speaker, and a Grove Rotary Angle Sensor. The RAS controls the DFPlayer's volume level. When the volume is not being set to the maximum level, the ...

While trying to setup an ESP32 as mqtt publisher I am getting strange errors. Here is my code: #include "mqttSetup.h" #include <WiFi.h> #include <PubSubClient.h> static byte ...

I'm trying to connect my ESP32 to this CO2 measurement device. I admit I am clueless about connecting devices with independent power sources to one another. I connected ground to ground and CLK to ...

The USB cable that came with the Arduino board is not easily recognized by the computer for selecting the appropriate COM port, For powering the Arduino it works fine (the board will light up when ...

I Have been working on a power logger with INA219 and L298N the thing is, the voltage and current displayed on Serial Monitor is not the same on my multimeter. the Arduino is connected to the pc to ...

I am creating a system of 10 nodemcu(s) communicating and sharing data over painlessmesh. Each of these is powered by 240V to 3.3V power supplies. One of these nodes is designated to collect the data ...

I'm trying to POST the data of total, but it returns 400. but when I try a sample data like int httpResponseCode = http.POST("{\"amount\":\"total\"}"); (400) into int ...

I would like to begin to understand ethernet handshakes by integrating an Ethernet over USB protocol within an arduino mega or nano. Is there something about the ethernet protocol that requires more ...

const byte interruptPin = 4; void ICACHE_RAM_ATTR count(); void setup() { Serial.begin(115200); // Set up our digital pin as an interrupt pinMode(interruptPin, INPUT_PULLUP); attachInterrupt(...

I'm working on a project and I need to send 2 datas and receive them at the same time. My question is: Is it possible to have 2 Arduinos both have 2 HC12 (total 4), because I want each Arduino to send ...

I'm trying to build a flame sensor using an Arduino that is displaying analog data in serial monitor. If I want to make it wireless, which module should I use so that I can see those analog values on ...

I am new to using an Arduino, sorry if this is very basic. I have 2 Arduinos and I have hooked up 1 HC12 and a joystick to each. I wanted to know if it is possible to send the x and y inputs of the ...

I have linked an external push red colored button to my arduino but when I press it, instead of giving me HIGH or LOW, it resets the arduino. I am a beginner to this stuff so could someone help?

I have a problem with my ST7789. My display just piles up when I show the current time, or showing some variable value that changes.

/* MODIFIED TRAFFIC LIGHT SYSTEM W/ A COUNTDOWN TIMER FUNCTION BY JOHN SEONG THIS IS A QUITE ACCURATE SIMULATION OF TORONTO'S TRAFFIC LIGHT SYSTEM WHICH INCLUDES TWO 7-SEGMENT DISPLAYS THAT SHOW THE ...

I'm still getting myself acquainted with C++, so I expect this is a very basic issue I'm facing. I've got an OLED screen connected to a Teensy LC and can display text on it just fine. The Teensy ...

I have flashed an ESP8266 with the ESP8266 flash downloader that said my flashing had succeeded. But when I sent an AT command from the serial monitor it didn't respond and the TX/RX LED from the ...

I want to learn programming from the roots, so i have started learning interfacing different modules with arduino without using any libraries. i want to learn how to interface piezoelectric buzzer ...

the communication port (com11) is yellowed with exclamation marks in device manager and I am unable to run arduino on my computer. how to get rid of the yellow exclamation mark on the com 11?

I was working on Adafruit Electret Microphone Amplifier - MAX4466 with Adjustable Gain and ESP32. I want to send data to an app using BLE UART I have printed data to the serial monitor or serial ...

Im now working on a Node MCU based project but the problem is that i cannot upload the code to the board. Further more whenever i connect the usb to the NodeMCU my keyboard stops working and only ...

I have tried to use some OTA programming method by website servers like this method which was not successful and asked here. So I have tried the own Arduino library shown below: and changed the ESP ...

I am owner of a Departmental Store. I want to build a weighing machine with a hopper which will stop when the load in the packet reaches a certain value (For eg. 2 kg) Can arduino help me?

I have tried this video: ESP8266 Self Update OTA from GitHub Instruction and made this GitHub repo: And changed the main code to this type, but I get this error: HTTP_UPDATE_FAILD Error (-101): Server ...

I'm working on a very big project and want to upload this to GitHub for people to use (flight controller software) and I'm using libraries from other people to make the process in the beginning easier ...

New to Arduinos and stuff. I have tried the L293D and the transistor method but the motor just wouldnt work. I have tested the motor and it definitely is fine. Below is my layout for this attempt: ...

This is supposed to be a traffic light; as red should switch to yellow and then green & vice versa after the button press. However, it does not seem to work that way; instead, the red LED and the ...

I have a NodeMcu chip that I am attemping to run a script to create a file and read back from it. #include <ESP8266WiFi.h> #include <iostream> #include <fstream> #include <string&...

I have seen this video: Over The Air programming Tutorial For programming the Arduino modules via internet OTA system, so I have tried the adafruit account and don't find the AIO_KEY part on it, ( as ...

I'm trying to put an Arduino Nano in low-power mode using this guide: Arduino Low Power - How To Run ATmega328P For a Year On Coin Cell Battery. The article suggests 3 things: use the Low-Power ...

i tried to use an asynchronic webserver for a new project with friends using this tutorial. We want to run an FFT while also changing some settings via the webserver. Since the tutorial only put code ...

I want to set a temperature and have Nano turn on for 2 minutes then off for 2 minutes and repeat using the same temperature originally set and have the ability to change temperature settings and do ...

I tried to connect two modules that require I2C connection and they won't work at the same time. I used the Arduino Sensor Kit - Base. This kit does not need any connection, you just have to code to ...

From the image, the diodes share the same anode which is driven by 'Do Something'. My question is: through using Arduino IDE, what code should I write that connects the output of the multiplexer (Z) ...

im using ph meter DFROBOT v1.0 at i compiled the code from the DFROBOT web this is the code * # This sample code is used to test the pH meter V1.0. # Editor : YouYou # Ver : 1.0 # Product: ...

I'm a beginner of Arduino programming, when I dumped the following code into Arduino NANO board, at the first the output is as expected. But After few trials the 16*2 LCD display is getting off and ...

We are using ESP32 with arduino sdk for developing our application. In our application we need to implement BOD to detect with specific voltage level. Basically we want to set specific voltage level ...

In my NodeMCU I want a statement to turn on an LED, which is easy, just use pinnumber, HIGH. But, what I'm trying to do here is connect multiple LEDs to one pin like this: I just wanted to know if ...

I am using the MPU6050_light library for getting the data for my quad-copter. When I am obtaining the gyro values from the MPU6050 without running the motors, its giving correct values but on running ...

I am trying to bring the esp32 example code live. I am able to upload the image error free but when I remove the jumper and then press the reset switch, instead of seeing it logon to my network via ...

I have an LCD keypad shield that I'm using to control a Catalex serial MP3 module and I have an int variable that has the volume setting which can go from 1 to 30. I'm trying to send the variable to ...

I recently switched computers and installed Arduino IDE, Added SAMD21 to the boards manager and installed drivers. My sketch previously ran on my laptop with no problems. Now when I try to compile ...