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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88 views

Digital pins are no longer outputting enough to click a relay

I've been working on a project for awhile now, and I ran into a problem a week ago I couldn't solve. I'm using an Arduino uno R3. My project involves the use of 4 relays triggered by the digital pins. ...
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1answer
73 views

Programming ATtiny85 with Arduino-IDE and an 8MHz external oscillator

I have a digispark ATtiny85 development board and I am using the Arduino IDE to program it along with the Arduino UNO as my hardware programmer. I have successfully burned the fuses for both the ...
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2answers
75 views

Arduino UNO with integrated ESP2866 wifi not working correctly

I bought this "knockoff" Arduino UNO with an integrated ESP 2866 wifi module. But I can't make it work. I've followed this tutorial because it's the same product as I have, but I can't make ...
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58 views

Scheduler comparison for Arduino Uno

I understand that the official Arduino Scheduler doesn't support Uno, and there are several third-party schedulers to fill the gap, notably, Scheduler, Arduino-Scheduler and TaskScheduler. There are ...
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1answer
23 views

Arduino esp8266 some times data will not be sent to thingspeak.com

I have made an arduino IOT that sends temperature data to thingspeak and works fine . Now I have two questions 1- In spite of active wifi connection from esp8266 toward the web , but why sometimes ...
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193 views

Cannot use Flip, getting AtLibUsbDfu.dll not found error

I am a total beginner. Trying to use the Arduino Uno R3 as a game controller (https://www.youtube.com/watch?v=GrO8ZmxbOyI) I came to a point in tutorials, where using FLIP / UnoJoy to "turn" ...
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0answers
22 views

Multiple arduino slaves with one master computer that sends instructions for the actuators to work

I am in the middle of an automation project and suddenly after completing one stage of my assembly, I now need to scale it. So my computer which until now was sending data to only one arduino UNO can ...
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3answers
131 views

send values from arduino uno to wemos d1 r1

I have a weather project in which I have to measure the temperature and humidity ( dht22 sensor ), the pressure and other things and then show them in a local web page ( usings wemos d1 r1 ) in either ...
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0answers
44 views

Problem uploading to board. arduino-1.8.8-windows [closed]

Arduino: 1.8.8 (Windows 10), Board: "Arduino/Genuino Uno" Sketch uses 2018 bytes (6%) of program storage space. Maximum is 32256 bytes. Global variables use 50 bytes (2%) of dynamic memory, ...
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2answers
41 views

Get a specific item from comma separated text

I use bluetooth (works like serial monitor). Let me say i send a text to my hc-05 (same as sending to serial monitor) My current code is displaying text from serial monitor/HC-05 TO LCD #include <...
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0answers
38 views

Arduino unable to wake up using interrupt after sending SMS

my use case is that I am building a distance sensor using Arduino Uno. The idea is when the distance is between a threshold, an SMS is sent from the device. I am using DS3231, SIM800L, and HCSR04 for ...
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0answers
32 views

How to program the joystick button to reset everything?

In this project, I'm making a stickman rush game with a joystick. Where when the joystick moves up and down, the stickman also moves up and down. And there are obstacles, that when the stickman ...
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0answers
40 views

Is it possible to make a touchpad for PC using arduino and a touchscreen display? [closed]

What would be the difficulty for such project? What components would be best fit for communicating gestures to windows (thought about arduino uno r3 and LCD TFT 3.5” UNO)
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1answer
45 views

UART between arduino UNO and pc via USB not in sync

I connected my arduino uno to my system and then using serial tried writing and reading data but there is a problem which I found when I tried giving arduino crafted messages. My arduino code is ...
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0answers
34 views

What specific type of plastic does the Arduino Braccio arm use? [closed]

I've looked all over and I can not find the specific type of plastic that the Arduino Braccio arm uses.
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1answer
39 views

arduino will not save data after receiving from serial communication

I'm new to Arduino and what I'm trying to do is change the variable by sending it from php to the Arduino. I've added the delay as stated by other questions but it has not worked so far. The pin 13 ...
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1answer
58 views

Store button presses in an array and sequince it with the LEDs

Example: If the user presses the button sequence 1-2-2-1 then the LEDs light up in the order 1-2-2-1 int userAmount[4]; const int ledPins[] = {4, 5}; const int btnPins[] = {8, 9}; int ...
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2answers
48 views

Read sd card content(text files) and display it on lcdi2c

i am working for a project based on lifi using arduino and i need to diplay content of sd card to lcd i tried a lot some online programs also i tried but there is a simple blank screen. one of the ...
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1answer
35 views

int array passed through function has wrong values only after multiple passes

I have this code: for(int i = 0; i < its; i++) { x1 = random(0,4); y1 = random(0,4); multiLamp(new int[2] {3,1}, new int[2] {x1,x2}, new int[2] {y1,y2}, wait, 2); multiLamp(new int[...
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0answers
48 views

How to completely clear everything from an arduino and print something new?

I'm in progress of making a stickman rush game, Until I hit a bug that I have been stuck on. I want to make a if statement that states "If the stickman and the object are in the same place, clear ...
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1answer
61 views

AVRdude does not read the FUSE byte values correctly

I am exploring the ATmega328p MCU via a standard Arduino UNO, with the help of avr-gcc toolchain and AVRdude (All in the WINAVR package). I have successfully programmed the board a few times with it. ...
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1answer
33 views

[SOLVED]how to send command to Gsm module from Arduino via serial port

Am using SIM7600X 4G HAT module (GSM) and Arduino Uno after I start the module and Arduino, I receive data from Gsm module but I can't send any command to it. On my Arduino board when I get data RX ...
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1answer
72 views

Arduino simulator - generating sine wave from PWD (Oscilloscope read is rectangular)

trying to create this simple circuit where a rectangular voltage input is transferred to a sine wave output. the process is quite simple, but I couldn't see the actual sine wave when connecting an ...
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1answer
37 views

How to print something when a character touches a character

I am making a stickman rush game, where it goes up and down and then there is a object that scrolls to the left. Whenever that stickman touches the object, it prints game over. However when the object ...
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1answer
28 views

How to receive commands to a running arduino program from a raspberry pi?

I have looked all over for a solution to this. I'm a noob in the arduino space and am really just getting my feet wet. It's possible that I am interpreting what I am reading wrongly. If so I apologize....
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1answer
35 views

Getting errors i don't understand [closed]

I was following a tutorial for my class (the tutorial was assigned) and I did everything the guy did to the letter but i got errors he didn't and they were errors I didn't get while programing similar ...
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1answer
174 views

[SOLVED]SIM7600 Module Power up by Arduino Uno doesn't work

Am using SIM7600X 4G HAT with Arduino Uno I follow to manual to Power up the module and it works well, The NET light flashing. But when I connect to Arduino Uno and use DigitalPin 2 write (High -> ...
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2answers
55 views

How to convert kitchen timer code into a countdown

I found this code for a kitchen timer, it was the closest thing to a countdown. The code is here: #include <LiquidCrystal.h> const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; ...
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1answer
61 views

What is the difference when an arduino has been unplugged vs when a serial port connection was closed?

Using python code for a serial port connection to an arduino, it sends a value to the arduino, which then starts printing values to serial. The python code will print the value on the first or second ...
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1answer
62 views

How do I add Gyroscope, Accelerometer, Euler, and Temperature data to one Arduino board?

I have to use a BNO055 to get temperature/accelerometer/Euler/Gyroscope data into one Arduino board for a school project. I am very new to coding so I am not familiar with the commands. I have gotten ...
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1answer
43 views

Arduino H-bridge for rc car

I've got an old rc car laying around, of which i would like to swap the insides, but re-use some of the parts that are already in there. The car runs 2 dc motors: one for steering, one for throttle. ...
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1answer
43 views

Using PWM pins on the UNO to generate Stereo Sound

I am trying to generate stereo sound using an Arduino UNO. Instead of using a separate DAC chip (as shown here), can I use the PWM pins on the UNO along with a low-pass filter? Also, would I need any ...
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1answer
41 views

TimedAction.h: No such file or directory

I am new to Arduino and I am trying one of the library TimedAction.h for sudo multithreading on Arduino. However the library is not present in the Arduino. How do I install external library(if it is)?
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0answers
46 views

Need help - skipping over some serial.print statements

I have a project I'm working on for a chicken coop. I want to control the door with timing of the sunrise and sunset. Also looking to a few other things but somewhere along the way, I must have ...
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1answer
73 views

Convert from hexadecimal to binary

I need to simulate a pulse train. Everything is in order with this code, it solves its problem. The question is: I need to change the keys, but it is too difficult to manually type in so many zeros ...
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1answer
123 views

Reproduce simulated temperature data with Arduino

I'm starting a test using Arduino to reproduce a set of temperature values in water each three hours and need some help with it. I will use two ds18b20 sensors to control two thermostats connected to ...
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0answers
55 views

Arduino Uno I2C two sensor connection Issues

I have been working on trying to get the MAXREFDES#117 PPG and the LIS3DH Accelerometer to run together. I am modifying the sample code found here to do so: https://github.com/...
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1answer
33 views

How to use LCD Screen and IR Remote to broadcast a countdown

I am trying to use an IR Remote to input date's and time's for a countdown, so then the LCD will display a countdown, like this: LCD: Enter Year Remote-Input: 2021 LCD: Enter Month Remote-Input: 08 ...
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0answers
19 views

ARDUINO Circuit simulation with PV panel [closed]

I need to create a circuit with the Arduino Uno board like you do in Tinkercad where I show how I connected each pin of the board. The problem is that in Tinkercad I do not have a module for a PV ...
2
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1answer
45 views

Arduino buzzer code sequence not triggering

I have a problem with my arduino buzzer: the code should be doing the following: I have a security system where in order to open the door you have to enter a 4 digit code from the remote. If the code ...
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0answers
47 views

How can we remove unused feature in Arduino's standard SD library so we can reduce the sketch size?

With the ReadWrite example in Arduino IDE, the sketch size is 10980 bytes (34%) of an Arduino UNO's storage. How can we reduce the sketch size? There isn't any kind of #define to turn on/off features ...
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1answer
47 views

I've been working on a project and I get an error compiling for board arduino uno. kindly help

##include <jm_LiquidCrystal_I2C.h> #include <LiquidCrystal.h> #include <Wire.h> // For I2C //Set the pins on the I2C chip used for LCD connections //ADDR,EN,R/W,RS,D4,D5,D6,D7 ...
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0answers
15 views

Error in program that measures distance from a ultrasonic sensor

I am trying to use an ultrasonic sensor in conjuncture with different devices like a proximity sensor and a solenoid and alarm. This is how the project is supposed to work: A container is placed on a ...
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1answer
30 views

Arduino recieve sensor data from other arduino SPI

I have Arduino Uno (sender) and Arduino Uno Wifi rev 2 (receiver). I want to send the ping value to the other one via serial - jumper wires. Arduino Uno is using the newping example, and I want the ...
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0answers
56 views

Serial.write and Serial.read problems

I need to send data from an Arduino mega to an Arduino Uno for XOR calculation Input data is an integer in the range 0-10 Input data is sent every 500ms On the mega: void setup() { Serial.begin(...
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0answers
33 views

Proper wiring for a HiLetgo DAC to Arduino

I have been having trouble finding any recourses for a DAC chip that I bought. It is the HiLetgo PCM5102 DCA. https://www.amazon.com/gp/product/B07Q9K5MT8/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&...
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0answers
60 views

I need to make button to turn off my alarm on clock

well I get task to make school project alarm clock using arduino, xd as you can see im not very good at it i mean i know something but not everything so please can someone help me, i copied this code ...
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0answers
23 views

FG Frequency output

I have bought the Brushless DC-Flat Motors Series 2610 and Pin number 6 is called FG which is defined as frequency output. I have plugged this pin into the Arduino in A0 and I have tried displaying ...
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1answer
36 views

Insufficient force from 6v 1A push-pull solenoid powered by a stepped down 9v battery (relay) to be used as a kicker, why and what can be done? [closed]

I am powering a 6v 1A push-pull solenoid (https://www.tinytronics.nl/shop/en/robotics/accessories/solenoid-push-pull-6v-300ma-jf-0530b) using a 9v rechargable battery using a relay; the 9v is stepped ...
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0answers
23 views

Programming heart rate monitor with keypad 3x4 input [closed]

i want to make a heart rate monitor with a bpm result classification to classify if the heart rate is normal or not(abnormal). also i want to make it able to input age with keypad 3x4 and classify the ...

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