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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Controlling VFD with ModBus RTU via RS485 and Arduino

I am attempting to control a Folinn VFD (Manual: Manual) with an Arduino Uno via a MAX485 module such as this. Pins for MAX485: DI > D8 DE & RE > D10 RO > D11 VFD settings: F00.01 set to 2 ...
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Using Arduino Sensors with STM32 based NUCLEO boards

Right now I'm programming an Arduino Uno Rev3, I'm using a Sensor Shield v5 (image at the bottom) to be able to have several Ultrasonic sensors and Servos. Right now I'm thinking about getting a ...
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Creating rather than following tutorials/instructions? [closed]

I'm looking to get into electronics, with a lot of interest in Arduino and Raspberry Pi, but also maker culture as a whole. I'd like to really be able to create and engineer a bit. Taking a glance at ...
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Reading sensor with current ouput with Arduino

I am having diffuclt times with this sensor, so I kndliy ask for your help! The sensor is named "SPUVA-CS-C3535-A", datasheet here. The sensor I use (cs3535) has just two pins (+ and -). From my ...
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How to connect MPU6050 with Arduino Uno without using A0-A5 pins?

Connecting MPU6050 with Arduino without using A0-A5 pins.
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Repair my code.and solution this problem [closed]

const int button1Pin = 2; unsigned long led1OnTime; bool led1On; int ENA = 9; //ENA connected to digital pin 9 int ENB = 3; //ENB connected to digital pin 3 int MOTOR_A1 = 7; // MOTOR_A1 connected ...
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MCore(Arduino) - Python bluetooth communication

Pc and Mcore with bluetooth module are paired. The port is COM9 outgoing in PC. However, when I send message Arduino does not get anything. I just disconnect arduino from pc and write simple code in ...
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how to combine these two sketches [duplicate]

LCD #include <Adafruit_Fingerprint.h> #include <SoftwareSerial.h> #include <Wire.h> // Comes with Arduino IDE #include <...
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merge two loops in arduino uno?? compiled but not working [duplicate]

#include <Adafruit_Fingerprint.h> #include <LiquidCrystal_I2C.h> #include <Wire.h> SoftwareSerial sms(2, 3); SoftwareSerial mySerial(4, 5); LiquidCrystal_I2C lcd(...
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Can I control 1,500 LEDs from 1 Uno? [closed]

I have 1,500 LEDs that I would like to be able to control with one Arduino Uno board. Would I be able to do this?
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Aruino UNO not getting programmed on MAC OSX

I am using MAC OSX Mojave and trying to program an Arduino UNO board. However, whenever I start the Arduino IDE, I only find one port in the ports section called: /dev/cu.Bluetooth-Incoming-Port. ...
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2answers
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Arduino Analog to Digital Conversion from 56V DC Batteries

I have a problem, I am using 56V DC combined batteries system. I get ADC values comes to Arduino like 211, 217 etc... I have to find out when the DC volt drop to 42V. How do i know the digital value ...
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10 DOF gyro and accelerometer to x,y,z displacement

I have a 10 DOF sensor with wire outputs labeled "VIN", "GND", "SCL", and "SDA". I would like to wire these into my arduino and ultimately obtain x, y, and z displacement. This might sound like a ...
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1answer
22 views

MB-102 BreadBoard Power Supply Limitation

Does the MB-102 can handle Arduino Uno, SIM900 and 3 other modules that requires 5v? If yes, does 9v battery is enough? If no, please suggest me what should I use that uses only 1 barrel jack(if ...
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1answer
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upload sketch via bluetooth for android

How can i convert file .ino to hex file so that i can compile new sketch via bluetooth. Can you help me to figure out the way to do this? thanks for helping
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1answer
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NEO-6M is working but it doesnt show data

So I'm having a little bit of difficulty here in my NEO-6M. The problem is it doesn't show any data in my serial monitor. My NEO-6M Led is already blinking so its already ok. RX -> Pin3 , TX -> ...
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How to interface 5 flex sensor and MPU6050 with Arduino Uno at the same time? [closed]

Circuit for connecting 5 flex sensor and MPU6050 at the same time and to address them in program.
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LCD not displaying text (16x2)

(https://circuitdigest.com/microcontroller-projects/arduino-based-accident-alert-system-using-gps-gsm-accelerometer) the code is Serial.println(zValue); ..... ..... ........ ... Here we have also ...
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16 views

how to program NEO-6M with arduino [closed]

anyone have blind person navigation project with ultrasonic and GPS code for Arduino thanks
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how can I draw a path (track ) using NEO-6M GPS and arduino [closed]

I want to give a path to a blind persons to help them to move from one place to another
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1answer
50 views

Voltage at AREF pin

I find difficulties to measure correctly the voltage at the AREF pin. I would measure voltages ‭with a resolution not exceeding 1 mV . nda voltage divider In one of my trials, I was using a 9V ...
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22 views

How would i code to log data for a Temperature, pressure and weight (scale/balance) sensors? [closed]

i am a complete novice when it comes to coding and the use of an arduino/raspberry pi or a labjack. The task involves a small pressurised vessel containing some liquid and i have been asked to log ...
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34 views

DS18B20 temperature sensor not working

I am new to arduino.I try to read temperature using DS18B20 temperature sensor.I connected the pins as bellow.But,When I connected 1-pin to ground and 3-pin to +5V the sensor heated and all the little ...
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24 views

Tensione al pin AREF [closed]

Ho dei problemi nella misura della tensione al pin AREF. Il mio scopo è di impostare sulla scheda Arduino 1 una tensione di riferimento abbastanza bassa da portare la risoluzione della scheda (4,8 mV/...
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1answer
34 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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30 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
20 views

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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1answer
22 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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1answer
36 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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32 views

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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29 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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34 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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1answer
20 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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34 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
42 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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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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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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15 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
45 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
46 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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0answers
19 views

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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0answers
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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