All Questions

I'm trying to upgrade the door buzzer/intercom system in my apartment so I can control it with my phone. It's a very simple system, attached is the wiring diagram(it's the 4-wire intercom station, ...

I have been trying to connect the MIT App Inventor to the Arduino IoT cloud, but I get the following error: The error seems to say that my client_ID is incorrect, so I believe I have got a wrong one. ...

I am trying to flash 3 leds at the same time with different flash rates.I created a class and wrote a function to achieve this,but the task is to flash led2 & led3 only once when a push button is ...

I got one of those $1 heartrate sensors with the LED, and while I see there are lots of people who make it work, there are also quite a bunch that seem to fail. My situation: I hook it up to 5v and ...

My Arduino program produces debug/error output using methods like Serial.printf. I can see all this output when it's connected to the computer, but I want to also log all this same output to my board'...

I'm working on building a drone with an Ardunio Nano, but the DC motors won't work. I tested the motors earlier and they definitely work. I'm following this tutorial: https://www.circuito.io/static/...

this is not exactly an Arduino problem but i thought someone on here may be able to help me. i have these Chinese made off the shelf touch switches https://www.fruugo.co.uk/5pcs-xd-613-onoff-touch-...

Hey Arduino enthusiasts :) I have purchased a LilyGo T-Call board. Which has a Esp32 processor and a SIM800L GSM module. For my project i want to send location data over the 2G cellular network. I am ...

In Library Manager RTClib and DS3231 work somehow with older versions. RTC time can picked only once and then it give bullshit. Using newest versions screen is empty. In picture first time is right, ...

I have an i2c device that i would like to rreverse engineer. Using the oringal master of the device here is a snapshot from the logical analyzer I would like to replace the orginal master of the ...

Scenario: Existing project: read soft serial then do http post New project: MQTT player from other (MrDIY / MrDIY Audio Notifier · GitLab) Objective: Combine together (Result: successful ) Issue: When ...

Anyone knows how to attach the l293D motor driver shield on a breadboard? I need to put the shield on top of a breadboard and then use an Atmega328P as the main way of controlling it. Than you :)

i was programming my node mcu i modified the code and got a complination error but when i compiled the original code i got no error modified code #include "arduino_secrets.h" #include "...

I just bought two 2D10 temp. sensors, one go them is analog and the other one is digital, I/m trying to connect them with the Arduino to get their readings, I looked for several resources about how to ...

I have an HC-05 Bluetooth module setup with Arduino that controls an LED light through Bluetooth commands. When the HC-05 is connected to a device, the red light on the HC-05 has a cycle of turning on ...

My question is that, if there is a project like for example a fire alarm. But it is using a arduino Leonardo and I am only able to use a arduino uno for my class that I have. Can I use a arduino uno ...

I am using a L293D as a motor driver on an arduino uno. Does it do hardware damage when I switch the DC motor on and off every milisecond? Here's my code: const int ctrlPin = 9; void setup() { ...

I have a basic code for an arduino esp8266 wemos board device, and the code will not compile because of an undefined reference to setup. float light; void Setup() { pinMode(A0, INPUT); Serial....

I am working with an arduino pro micro and I am facing a peculiar problem. The project I am working with includes arduino MKR NB 1500 as well. I am transferring data from MKR NB 1500 to arduino pro ...

i just got my hands on on my new esp8266/nodemcu. i tried making a simple home automation project but only very dimmed blue led glows and when i on / off the button nothing happens same with the blynk ...

I recently brought two Arduino UNO boards and were working perfectly with the previous version of Mnajaro. But there came a small os update after which the Arduino ide itself is not recognizing ...

I'm currently reading 3 limit switches and sending those data over Serial.write using the following code. #include <SPI.h> #include <Wire.h> #include <arduino-timer.h> //Define ...

I started a simple project on air-quality monitoring, starting with the simple carbon dioxide (CO2) concentration measurement using the MQ135 sensor powered by an Arduino Uno. I have run a simple code ...

I have been trying for a few days to add a countdown to go from 1 day to 0 on an LCD screen after a few pieces of code. The problem is that it's worked once with somebody elses code seperately but I ...

A while back I downloaded TimerOne and manually installed it in the wrong library along with the other standard libraries. This morning I downloaded an adafruit library the proper way from inside the ...

In the simple example below I just software trigger an ADC acquisition and then set the builtin LED's digital out in the interrupt handler. I don't know why the program appears to halt however. void ...

Hello i have a custom board of the RP2040 and would like to use the ethernet library. But the ethernet example webClient uses the default SPI pins of whatever board it is being used, but what if im ...

Working on making a controller for a haunted house prop. Trying to get it to interface with a device. Was able to use a serial analyzer to see what commands and values are being sent. the hex codes ...

I wish to remove 2 resistors in power supply unit and put variable resistors that would be controlled by my microcontroller. 1st resistor should be in range of 3000-6000 Ohm 2nd resistor should be in ...

I am using Arduino to remotely trigger a shutter action. All is well, until I hook up a USB cable on the 4 regular USB pins. This cable runs between a Sony camera and a printer. But I can not take an ...

I tried to compile the following code (using Arduino 1.8.16 with an esp8266-12) extern volatile unsigned long timer0_millis; unsigned long new_value = 0; void setup(){ //Setup stuff } void loop(){ ...

Is there a way to update the firmware on one ESP32 from another ESP32 over USB, similar to how firmware can be updated using esptool.py? This would essentially be like a port of whatever magic esptool....

My problem is I keep getting the following message on any sketch I try to upload even a blank one: avrdude: stk500v2_ReceiveMessage(): timeout avrdude: stk500v2_ReceiveMessage(): timeout avrdude: ...

I've uploaded a blank sketch in Arduino to give AT commands to REYAX RYLR890 module manually. Even when I give AT\r\n as command, still I get +ERR=1 as response which means that there is no Carriage ...

I have a strange issue while trying to run the hello world code on an arduino nano connected to an OLED display. This is the code I used: #include <Adafruit_SSD1306.h> Adafruit_SSD1306 ...

I want to reduce memory used when loading data from Preference as I just want to read part of that array specify by index (As EEPROM manner). As example code appear to load entire array at once. That ...

I am trying to create a chain data transfer where data is collected from one microcontroller to the next and then it transmits the data of the previous microcontroller which it collected and the its ...

I bought 10 meters of sk6812 rgbw led strip (60/meter). Now I would like to buy esp32 and install WLED there. I have the following questions: how to easily connect the led strip and the board? Will ...

I have a potentiometer connected to an analog pin A1 and would like to implement PID Control to move a robot arm up and down based on to a given serial command. For this to work I will need PID out ...

I am using a ATTINY85 Digispark board with an IR receiver to light some LEDs in my project. The Digispark has a limitation that does not allow it to use the IRremote.h library. I know that there a ...

I've written a sketch to drive a differential drive system, specifically - to be able to drive strait. This does work. So I am trying to add the ability to stop when the path is blocked using US ...

This are the following code which code for accelerometer, vibration sensor ,ultrasonic sensor ,gsm and gps FOR ACCELEROMETER const int xInput = A0; const int yInput = A1; const int zInput = A2; // ...

I have an analog signal +/-15V @ ~4mA that I would like to distribute to up to 8 receiving devices. I am looking at analog multiplexers, but I cannot understand what is the range of the signal line. ...

I have what I think is a simple use case. I want to feed product information (product quantity remaining, price) to an online aggregator with a large customer base. This aggregator provides the ...

I understand how pullup and pulldown resistors work with push buttons and I also understand that an analogous idea can be applied to slide switches. Furthermore, I know that some versions of Arduino ...

I have 3 motor drivers and all 3 other them only seem to only work on one of the 2 sides. I have used a voltmeter to check the voltages across the each of the 2 sections on each motor driver. For all ...

I have a class with 12 instances of a button, to create a keypad( meaning that this is the only case I use 12 instances). But this class can be just a button array of any other number between 1-12. I'...

I've got an Arduino UNO + WiFi R3 board. I've left the dip switches in off position. When I connect power through usb, and try to scan available wifi networks, I expect to see ARDUINO-UNO-WIFI-*. But ...

My wiring now This is my code #include <Wire.h> #include <Adafruit_AMG88xx.h> Adafruit_AMG88xx amg; float pixels[AMG88xx_PIXEL_ARRAY_SIZE]; void setup() { Serial.begin(9600); Serial....

I have a very simple routine that lights up the built-in LED (pin 13) when a system tick timer fires off its interrupt. I override the weak reference to int sysTickHook(void) found in hooks.c. I found ...