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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5 views

Why does per-led current consumption diminishes when more leds are on?

I'm rather new to Arduino. I've been performing some current consumption measurements lately, with a INA219 current sensor, on the blue LEDs from a starter kit. I plugged three LEDs, on pins 2, 3, ...
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17 views

How to create a Pll using arduino uno? [closed]

I have a project which needs A PLL controled by arduino uno to manipulate the phase si please help me !!!!
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1answer
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Wire multiple SW-420 Vibration sensors to a single pin

I am working on installing an alarm system using Konnected IO on a NodeMCU esp8266. I have multiple bay widows which will use 4 SW-420 vibration sensors. I would like to wire all 4 of the SW-420 ...
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16 views

How to use tinygps.h library to measure distance? using NEO6mv2

any reference site for the format code for tinygps.h to measure distance? or any codes for tinygps.h for measuring distance i'm just a beginner in learning arduino thank you
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20 views

Reading 4-20ma signal on arduino

I want to read a 4-20 mA analog signal from a 24V flowmeter. I've read the simplest way is to convert it into 1-5V signal using a 250 ohm resistor. The thing is I want my reading to be precise so my ...
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I want a code to run multiple time once i uploar it [closed]

I have an A6 gsm/gprs but the code doesn't run multiple time it runs once uploaded and then goes silent. Here is the code #include <SoftwareSerial.h> SoftwareSerial mySerial(3, 2); void setup(...
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Setting up Software serial connection between Esp8266 and Arduino

I have a Lolin Wemos D1 R2 and mini version of ESP8266 and an Arduino UNO. I have connected the pin described as Rx in Arduino to the pin described as Tx in ESP8266 and the same for pin described as ...
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25 views

How to send sms message on specific area using Longitude and Latitude

Good day everyone! what code should i used for sending sms message depends on the area. the things that i used in my protoype i have MPU6050 accelometer, SIM800C GSM MODULE, NEO6MV2 GPS MODULE. So the ...
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31 views

requires 18 bits to represent, but 'int' only has 16 bits [-Wshift-overflow=] #define htons(x) ( (((x)<<8)&0xFF00) | (((x)>>8)&0xFF) )

I am doing smart room automation system. I am getting this error when I tried to compile the code and also just for the test I tried to ping one LED when I switch ON it LED is becoming on but when I ...
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18 views

How to find the peak value of analog signal?

I have a question .. Please help me I don't know how Arduino can read the peak value of the sensor signal. The value I want is in the ADC value .. What I want is ... for 5 seconds there will be 1 ...
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1answer
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How to calculate the RZERO value in MQ135 sensor, I have already burned it for 24 hours?

I've already burned it for 24 hours and it is now giving the constant value of 932.36,pls tell me how to calculate the RZERO value.
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Need Help for Home Automation Based on Arduino + Ethernet Shield using Android studio

My project is Smart Room based on Arduino using android studio. Project scope is to control room appliances like fan, door, light. I have completed all the code as below and connected Arduino Uno with ...
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Connecting Arduino Uno to Arduino Leonardo

I have an RFID shield connected to my Arduino Uno, but I want it to be able to send keystrokes to the computer when I scan the correct card. I have the Uno set up correctly so that when the card is ...
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32 views

Detecting a Short Circuit on a Reed Switch

I'm just working on a personal project that's I believe is simple, but I'm a little stumped as I'm not sure if it really IS SIMPLE. What I am currently thinking is that I have simple circuit that is ...
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1answer
40 views

Random characters transmitted from ESP8266 to Arduino

Below is the code for getting a value from Firebase and sending the received data to arduino for performing necessary action. The code here here sends a string "o" to arduino once //uploaded to ...
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32 views

void setup () } expected primary-expression before 'void' [closed]

const int VAL_PROBE = 0; // Analog pin 0 const int MOISTURE_LEVEL = 900; /* the value after the LED goes ON */ void setup() { Serial.begin(9600); } void LedState(int state) { digitalWrite(12, state);...
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Serial Communication Problem Between - Arduino UNO and ESP8266 (ESP-01)

I have built a Small Project to illuminate a connected LED on the Arduino-Uno via the internet by ESP8266-01 using the adafruit website but the problem is getting a wrong result and not lighting the ...
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15 views

Using SMS to send commands to the Arduino. Having problems in data parsing

I'm still inexperienced in programming and i apologize in advance if my mistakes are stupidly obvious. This sketch I'm working on is a basic GSM project using SIM900a Mini and an Arduino UNO that ...
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11 views

How to take input to the system using a GSM module [closed]

Hey I want to take the received sms to the GSM module as an input and respond to it.My project aim is to find whether the person is safe or not .So to know the response of the person what I need to ...
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23 views

Cant make connection between ethernet shield and Arduino

My project is Smart Room based on Arduino using android studio. Project scope is to control room appliances like fan, door, light. I have completed all the code as below and connected Arduino Uno ...
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1answer
39 views

Access Control System with an 4x3 Keypad & RFID-RC522

hey guys I have a access control system working perfect with rfid and keypad. I would like to implement : If the PIN is entered more than 3 times incorrectly the card is disabled. someone could give ...
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1answer
44 views

Fixing serial communication , condition for serial data available checks out even after reading all the data sent

I have been working on monitoring an aquaculture , where I log the environment variables (temp. , humidity, gas sensor data) to firebase and control feeding mechanism via an app(where data can also be ...
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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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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
48 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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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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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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1answer
58 views

How to have 4 Arduinos communicate with each other? [closed]

I was wondering if it was possible to connect 4 Arduinos together so that the sensors input can be received by all 4 of them either by a wired connection or a wireless connection either way it should ...
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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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How to read file of sdcard with help of button control [closed]

Let me expand the subject, I want to create a program where I can display the files in the sdcard to LCD at once, meaning I need to press the down button first in order to view the next file in the ...
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sensor for glass bottles [closed]

i need a sensor to detect a glass bottle ( empty and transparent ). we usually use a photoelectric sensor but i was thinking of using ultrasonic sensor like Hc-sr04 . do you think it will give a ...
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28 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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23 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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34 views

Arduino that send gps data to firebase ( database) using gsm [closed]

I need help Arduino + sim800l + neo-6m gps = firebase (reatime database) Programming code please Or please tell me advice or tip
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1answer
38 views

Can you connect digital pin to GND/3.3v without external parts [closed]

WARNING: NOVICE QUESTION Hi I am messing around with a project, and I am trying to connect a certain pin (analog joystick x input) to my Arduino. After playing around with it, I found that I can ...
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18 views

How To Send Sms Notification To Mobile Without Gsm [closed]

Hey There I may Making a door Lock System Using FingerPrint And KEypad . I want to send a notification Message "Unknown User Found" whenever a wrong fingerprint or key is pressed. I dont want to use ...
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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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23 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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1answer
71 views

DIP switch highest position

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
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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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1answer
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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20 views

Don't found fingerprint sensor [closed]

I used Arduino Uno with fingerprint sensor.when i creat example Library successfully but when i click on serial monitor the error shows that don't found fingerprint sensor
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30 views

Double acting pneumatic cylinder with magnetic sensor using Arduino [closed]

I want to do programming of arduino 24V double solenoid valve to actuate two double acting cylinder with magnetic sensor The operation i want to perform is as follows: A-B-A+B+ 10sec delay A-B-A+B+ ...
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2answers
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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23 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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49 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
41 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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31 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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