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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Problem, horizontal lines in LCD TFT ARDUINO UNO between the text

I have an ARDUINO UNO and a TFT LCD of 2.4" the problem is that it does show the text but it has some lines on top of the text this is my code: #include <Adafruit_TFTLCD.h> // Hardware-specific ...
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2answers
23 views

How to stop program while Servo is rotating

If I code like this: motor.write(0); Serial.println("Before"); motor.write(180); Serial.println("After"); Both "Before" and "After" is instantly printed, while the motor is still rotating. I want "...
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1answer
56 views

OLED (I2C) and Micro SD card module not working together in Arduino

I am trying to write some data to SD card and read it back to serial monitor as well as display it to the OLED. Both the sd card and oled work separately but they seem to be interfering with each ...
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26 views

Why 3 cascading MAX7219 Seven Segment Display Modules are not working?

I have connected 3 cascading seven segment display modules. Two of them are working, but last one not working. Why? Also I want to connect other 2 more rows (modules)... Is any other way to do it? ...
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35 views

I want to save the value of the scanned barcode on an SD Card (in a text file may do)

serial monitor output #include <usbhid.h> #include <usbhub.h> #include <hiduniversal.h> #include <hidboot.h> #include <Wire.h> #include <SPI.h> #include <SD.h&...
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20 views

Arduino TFT LCD Data Logger

Can I use Arduino TFT LCD Module ILI9341 as a data logger? It has an SD card slot at the back, I wonder if the data will be saved on the SD card? Thanks!
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36 views

arduino and esp-1 stop workign after 1 day running

i'm trying to create a system that arduino and esp-1 send an GET request each 2 secs to a server and depend on server reply turns a LED on or off . system works good for 6-7 hours but stops after one ...
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24 views

LED Light Wont Light Up [duplicate]

Hey so I got a Arduino Uno today with a Red LED light. Everything worked fine until I disconnected it and then came back replugged it to see that the LED light dosent light up. I have connected the ...
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1answer
37 views

Running a robot with 2 front-facing sensors, but it's stuttering

Here's the run down: I have a small robot with four continuous servo motors and two ultrasonic sensors. It's run by and UNO board with a Sensor Shield V5 on top. My goal is to program the front right ...
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24 views

Using a Fingerprint sensor and 4X4 keypad together On Single Arduino [duplicate]

I have a project were I am controlling a Door lock with a fingerprint sensor and 4X4 keypad and Mobile App. all the sketches work fine indivisualy but i want to run these 3 module together. Means My ...
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75 views

DIP switch highest position [closed]

This modify code (original:https://github.com/SeeedDocument/wiki_english/blob/master/docs/Grove-5-Way_Switch.md) shows which position of 6-position DIP switch are On and OFF. How can I get only the ON ...
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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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1answer
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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2answers
66 views

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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1answer
55 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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2answers
74 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
44 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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34 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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1answer
48 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
98 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
101 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
52 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
107 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
45 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
65 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
32 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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0answers
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
49 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
40 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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43 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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46 views

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
98 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
84 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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0answers
25 views

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
53 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 ...