Questions tagged [arduino-uno]

The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.

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33 views

mp3 trigger, output to antoher input, no switch

I have two Arduinos: one is transferring on its output pin to other Arduino's input_pullup low or high signal depend on servo action (rotating/stop). I need an action on slave Arduino with dfmini ...
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24 views

Arduino Connect Long Wires/Cables

i am completely new to hardware programming and micro controllers and i am unable to figure out what search-engine search-term to use to find the answer i am looking for. the project i am working on ...
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I can't seem to get my code to work? (I'm not a programmer)

EDITED READ DOWNSTAIRS So, I'm trying to make a moisture checker for plants (with some tinkering to go it's supposed to work on 4 different plants) and the idea is that when I push the button it goes ...
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54 views

How to Set the Control Register on the DS3231 RTC module for Arduino UNO R3?

I am using the DS3231 RTC connected to an Arduino UNO R3 for a project. I won’t go into detail, but I need to save power, therefore I am using the DS3231 Alarm Interrupt to wake the Arduino from sleep....
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73 views

Substitute multiple potentiometers for push buttons and single potentiometers

this is my first post here. For some time I have been struggling with a problem and would like to know if anyone has a solution to share. I am building a 4 tone sequencer, where I use 4 ...
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24 views

ESP8266 and WPA2 PSK network

I'm having some issues with esp8266 connecting to a wifi network. I'm testing with a hotspot from a mobile phone. If I set the network to open (no security) my code below works without any issue. If ...
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51 views

POST request using WiFiEsp.h library

I'm using an arduino uno and ESP8266 (esp01) with the WiFiEsp library to connect to WiFi and POST data, connecting to WiFi works just fine. I need to send a POST request, but I can't get it to work ...
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1answer
43 views

HTTP parsing with authentication in Arduino + ethernet shield

i am trying to parse a page from the route by using Arduino + Ethernet shield. before Arduino testing. I tested my code via python as it shows below. from this code i can get the data as i wish where ...
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32 views

How to edit code from Node-Red to Cayenne

I am working on a project to run some (relays or LED's) on an inputs (Pins) Arduino by esp8266-01s . now while searching on internet I found a video divided it two step that talks about the issue ...
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42 views

Calculate straight line distance accurately

I am trying to build a Mine Sweeper game where there will be 4 X 7 blocks and each block is approximately 2 X 2 feet and the player will be standing on these blocks. I want to detect on which block ...
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44 views

Arduino UNO + USB Host Shield 2.0 + RFID RFC522

I'm trying to get done following. Connect a Keyboard over USB -> USB Host Shield -> Grab the pushed key (char) from the keyboard and write them to the rfid writer. So the code for the rfid writer is ...
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33 views

Trouble with 4 digit 7 segment display

So I spent a bit trying to figure the wiring and I THOUGHT I had it working but something interesting happened. Displaying works for only the numbers 1, 3, 4, 7, 8, and 9, but are weird when it comes ...
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46 views

Please help me read this Schematic Diagram

So, i'm trying to build an Obstacle Avoiding Robot by refering this site "Robot Obstacle Avoiding Car On the website they have provided with very poor Circuit Diagram. Please help me read the ...
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22 views

POST image from Arduino Uno

I need to post an image to a website. Iam able to capture the image using OV7670 camera module. But don't know how to store and post the image to a website. I didn't get any idea to start this. Can ...
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1answer
52 views

I think i worn out all of my Arduino Uno memory

Hi my Arduino Uno stacked with a motor driver shield was working perfectly however I am using the same board for a while now and suddenly my board stopped working. When I upload a code no matter what ...
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1answer
95 views

Serial Monitor presenting backwards question marks

Thanks to anybody who can offer some guidance on this issue . I would like to quickly point out that the microcontrollers being used are OrangePip Kona 328. When I put the light on the photodiode ( ...
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1answer
100 views

esp8266 ip address issues

I have android studio app and arduino codes they are connected to each other using esp8266 but it works only on one network when I use another network it doesn't recognise it's ip address instead it ...
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1answer
51 views

LCD screen stops displaying after DC motor starts

LCD screen stops displaying after DC motor starts I have 3 main components: LCD, thermal resistor, and a DC motor running a fan. The LCD displays the temperature reading from the thermal resistor and ...
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1answer
102 views

HTTP Post data from Arduino uno using WiFi

Please help me to post data from arduino uno to a webpage using wifi(ESP-01) module. I try with AT commands it didn't give the response from my webpage #include <SoftwareSerial.h> #include <...
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27 views

NodeMCU hc05 Connection

I am using a NodeMCU from Amica. I tried interfacing the HC-05 module to the NodeMCU. The following code works fine without any errors #include<SoftwareSerial.h> SoftwareSerial btport(D2, D3);...
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1answer
44 views

How to Read ADC value without Common GND ? (Possible or not !)

I want to Read external signal with the microcontroller. But the problem is that ADC does not work because the signal GND and the microcontroller are not Common, My question is, have you ...
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13 views

i need to connect ultrasonic gas MQ2 and IR sensor(as blink counter) to count the number of blinks

im making a drowsiness detection using IR sensor as blink counter less than 30 and ultrasonic sensor distance should be less than 50cm and gas sensor MQ2 if the driver has consumed alcohol the gas ...
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2answers
62 views

Arduino Uno lag in simple loop

I have a simple Arduino sketch which I have been playing with on my Uno. The idea is simple, the user turns a potentiate (pin A2), when they pass a certain threshold a LED is turned on (pin 7). Here ...
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1answer
30 views

Grbl on Arduino Uno (Elegoo) with DM542 + nema24 stepper motor not working

i've already searched and tried for a quite depressing amount of hours, but am not able to solve this problem: The parts are the following: - Elegoo Arduino Uno, on wich i flashed GRBL - 24v Power ...
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26 views

Save joystick movement and run a servo motor

I am planning to use a joystick to input joystick stroke directions, save the directions as number in a variable. The idea is to start a servo motor if the directions match the directions in the ...
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31 views

HX711 Arduino library creation

I'm trying to create my own library for HX711. In that, I created a .h file and a .cpp file. There are some issues in my program. Please tell me what the error in the code is. hx711adc.h file-> #...
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1answer
33 views

Arduino Firebase ESP8266 Connection

I am working on a project that needs data to be stored in cloud db so that I can access the data in a mobile application. For database I have considered Firebase. I am following the following link. ...
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1answer
47 views

How to print stack trace and register dumps on arduino serial monitor?

I want to debug my ESP32 module which is giving an exception using ESP32 exception decoder, but for that, I would need to have access to my stack trace to paste it. But currently, my arduino serial ...
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1answer
53 views

I want turn the led off only when the input is low for a prolonged period of time and not when there are ups and downs in sound signal [closed]

My project is baby cry detection,when the baby cries the led must turn on and when it stops it should turn off, but I want it to turn off only when the baby has stopped crying , not when there are ups ...
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1answer
39 views

Blank output in serial monitor

So my SIM900 GSM Shield is working fine with Netlight LED blinking and Status LED solid light, after I upload the code nothing happens about mySerial() in my serial monitor. Can I take your time for ...
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42 views

My motor driver shield l239D is making noise

Hi I am using an arduino UNO board stacked with a motor driver shield l239D and I am trying to only run 4 DC motors however when i put this code my board starts beeping and I dont know why. And none ...
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2answers
31 views

Resetting Arduino UNO code (newbie)

So today I started to learn Arduino uno. I have an LM35 temperature sensor and I got what I needed from it. Now it's just keep calculating till I plug it off. I know there is a reset button. When I ...
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Controled in the led by Arduino UNO to Firebase through ESP8266-01+ MIT App Inventor

exchange community , help me community :( I want to control led by MIT App Inventor with used Arduino UNO to Firebase through ESP8266-01 Notes : 1-The led connected pin 11 on Arduino-Uno 2-The ...
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2answers
97 views

LCD is supplied more than required current [closed]

So, i am trying LCD 16x2 module for the first time and don't how solve this problem. I know the current is more, also I've tried using Resistors, etc. but to no avail. Please suggest a solution. Also ...
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1answer
82 views

Communication between Arduino and python: serial port sending empty data

Arduino code: this code is provided communication between sensor gy-521 and arduino. I read data by the command "1", after 1000 samples arduino is waited for new command for read data. Arduino code ...
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1answer
24 views

Power Source for Arduino

So I have SIM900 Shield and Arduino Uno and they have both power jack, is it possible to power one of them using one power jack and connect it's power with another? If it is possible, I sincerely need ...
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what will be right way to parse boolean json and get false and true please help

else if(!jsonObject.isNull() && jsonObject.containsKey("Slider1")) { JsonObject bulbObject = jsonObject.getMember("Slider1"); cctSlider1 = bulbObject["Value"].as<int>(); ...
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1answer
43 views

How can I connect an ultrasonic sensor to my Arduino motor driver shield l239D when I don't have any space left? [closed]

Can you tell me how many sensors I can connect to the l239D motor driver shield? I want to put an ultrasonic sensor and two infrared sensors. Is it possible?
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1answer
52 views

Send Arduino data to Database using ESP8266

My project is to receive data from Bluetooth (HC-05) sensor and storing it in the database. I have successfully received data from Bluetooth sensor and stored it in a String variable. Now i have to ...
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19 views

Using arduino uno and an adafruit shield to control 3 dc motors and a linear stepper motor

Hello I am currently doing a project at my university which requires me to order and program 4 motors using an arduino. I will be using an arduino uno and an adafruit motor shield. 2 of the dc motors ...
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18 views

how to combine these two sensor coding in arduino uno [duplicate]

#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); #include <DHT.h> DHT dht(2, DHT11); int powerPin = 3; void setup(){ lcd.init(); lcd.backlight(); pinMode(...
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FSC-BT625 Bluetooth module (one Master - 10 Slave) with Arduino

I have a project that has #10 slave bluetooth modules. Each of them reads a value by adc and sends it to bluetooth master #. Please explain to me how this is possible. I read somewhere that this is ...
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1answer
61 views

If-statement matches but doesn't give a result [duplicate]

I just started two weeks ago with Arduino and I'm hooked! I got off to a good start and went through some online tutorials quite easily. Then came the RGB LED, which I couldn't get to work all of a ...
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30 views

How to create real-time WASD control over an Arduino Uno?

I am trying to figure out how to use the WASD keys on my computer, to go through the USB cable and then spin the Arduino servos in real-time. So if I press the “a” key, it should start to move left ...
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1answer
51 views

TX pin sends wrong data in Arduino Uno

I want to send some data to an IP Modem from Arduino Uno. That IP Modem has TTL levels TX and RX inputs. I used this connection between Arduino to the IP Modem: I am powering Arduino with 12 V ...
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2answers
94 views

Level shifting 5V <-> 3.3V

My main goal is to use connect the HC-SR04 ultrasonic sensor with ESP8266. Problem is, HC-SR04 works with 5V while the ESP8266 works with 3.3V In order to solve this, idea would be to use a logical ...
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0answers
22 views

Arduino Multiplexing several MPU6050 with a CD74HC4067 problem

I am really new to Arduino so probably there will be a lot of problems with my code... I need to get the data from various MPU6050 with just one Arduino ONE board, I managed to get the data with one ...
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28 views

DShot-Arduino library as a DShot receiver

I refer to this thread: Dshot implementation on Arduino (ESC protocol) and this library: https://github.com/gueei/DShot-Arduino Is it possible to use/adapt the library for receiving DShot as well? ...
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1answer
53 views

What is PWM actually? [closed]

tcommand=(pwm_value-480.0)/8.22; flapmag=(pwm_value-880)/41.0+10; In this piece of code used in arduino, I don't understand why PWM value is subtracted and divided like this. This is not my code. Any ...
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0answers
21 views

HC-05 Bluetooth module does not send or receive data when its on-board light blinks(light blinking after its connected to a device)

HC-05 Bluetooth module does not send or receive data when its on-board light blinks(light blinking after its connected to a device) as soon as the on-board led starts glowing it does not send or ...