Questions tagged [arduino-uno]
The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.
7,491
questions
1
vote
0answers
9 views
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 ...
0
votes
0answers
13 views
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 ...
0
votes
0answers
17 views
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 ...
1
vote
0answers
12 views
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 ...
2
votes
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/...
1
vote
0answers
20 views
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 ...
0
votes
1answer
33 views
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 ...
1
vote
0answers
27 views
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 ...
0
votes
2answers
30 views
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 ...
0
votes
1answer
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.
1
vote
0answers
30 views
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 ...
-2
votes
1answer
51 views
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?...
0
votes
1answer
35 views
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, ...
-1
votes
2answers
54 views
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 ...
0
votes
0answers
40 views
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 ...