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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SIM800C status LED not blinking

I am using an Allwin HW-537 SIM800C module. I am also using a 3.7V 2200mAH ICR18650-22F battery which discharges about 4-5 amps according to the datasheet. However, I am unable to get the status LED ...
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blink led 5 times with for loop

Is it possible to let a led blink, for example 5 times with Arduino? Should I use a For loop? Something like this works within the setup loop, but it will run continuesly in the void loop. So my led ...
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Arduino controlling WS2818 7-Jewel LEDs displaying random behaviour

This is my first Arduino project. I have bought some components to make some lamps with. I have an Elegoo Uno R3 Arduino controller for them. The LEDs are from a Chinese company called DIYMall and are ...
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sro4m-2 waterproof ultrasonic sensor

I bought this waterproof ultrasonic sensor about 5 of them with the part number SR04M-2 Written on the PCB silkscreen Which is different from the usual SR04t-0.2, they are just not working, I don't ...
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1answer
30 views

ST7789 TFT display only shows a correct image while Arduino reset button is held down - Why?

I am trying to get the ST7789 TFT display to work with Arduino. I followed online guides for connections and am using the fast library fron github and included workbench ino (https://github.com/...
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Communication b/w Arduinos, master(M) and slave(S) via Tx Rx pins. M sends query to S which shows the data in serialmonitor. S fails to send data to M

Slave code int arr[10] = {0,1,2,11,4,5,6,7,8,9}; char id = '1'; char re[2]; void setup() { // Begin the Serial at 9600 Baud Serial.begin(9600); } int ia; void loop() { Serial.readBytes(re,2);// slave ...
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Arduino Uno R3, WS2812B, 1 strip of 60 leds, segmented in to 4

Arduino Uno R3, WS2812B, 1 strip of 60 leds, segmented in to 4. Problem: Only want a single segment/fx_mode to run at any one time. #include <WS2812FX.h> #define LED_COUNT 60 #define LED_PIN ...
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Stepper motor not working as expected

Kunal Gupta: Guys plss help me .... I am having issues in using stepper motor I have tried both 28bjy with uln2003 and l293d .. giving it output supply of 5V . Motor is vibrating but its shaft is not ...
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Run HEX program from SD with another program

I want to write a program in which I can select a HEX file recorded on a SD card (via a LED screen, etc.) and run it, i.e. transfer control to it, like launching programs on a PC. Is this possible and ...
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19 views

Whatever components we connect to the Arduino, their grounds and 5v pin connection must be the same?

I am trying to connect different types of sensors & motors to the Arduino should I make their grounds and 5v pins on the same connection.
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Arduino UNO generate square wave, which is exactly the same with trigger pulse, but with a time delay

I am new in using Arduino so please forgive me if my question is too simple. I need to generate a square wave with exactly the same duty cycle and frequency with the trigger pulse. The trigger pulse ...
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Help needed!!! I have an upcoming exam [closed]

I have an upcoming exam about the codes and stuff. Its about the basics like "blink with delay" and the "millis function". I need to get these things learned but i have no idea how?...
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Using Arduino to create a countdown that unlock a box

Am new to Arduino. So permit me if I sound so novice. I want to create a countdown device (a clock that will countdown or something) that will unlock a box when the time is up. As an example, let say, ...
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2answers
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Programming an arduino using only switches to give 0 or 1

I am not too experienced about the working of arduino but I know that it involves data in computer language ( 0 and 1) I have an array of 8 switches plus a few extra. As I am unable to (due to some ...
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RobotDyn's UNO+WiFi R3 ATmega328P+ESP8266, 32Mb flash, USB-TTL CH340G, Micro-USB

I'm trying to use this board ([as shown on manufacturer's site][1] I managed connecting each one and uploading a minimal sketch. I conducted a test ( using appropriate sketch on each one and a wire ...

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