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Newest 'arduino-uno' Questions - Arduino Stack Exchange
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Learn more about TeamsQuestions tagged [arduino-uno]
The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.
8,141 questions
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-2
votes
2
answers
27
views
I need more free memory on my Arduino. What can I do if I don't want to use float to save space?
I realize that using float results in loading all or at least parts of the floating point library, which consumes a significant amount of memory.
But how can I avoid using float?
(this is a Q&A ...
0
votes
0
answers
32
views
SIM800A and Arduino Uno communication [closed]
I am having this issue with my SIM800A,I have tried to interface it with the Arduino Uno R3 board I am using,I use Digital Pins 7 and 8 of the Arduino Uno to connect to 5VT (TX) and 5VR (TR) of the ...
-1
votes
1
answer
62
views
How do I change what variable I am changing based on a separate number?
I am trying to change thing2 if I input 0, and thing3 if I input 1. I don't want to just have if/else to determine if I should be changing thing2 or thing3 because I want this to be more dynamic than ...
0
votes
1
answer
29
views
Replace bootloader in ATTiny88
There are other threads about replacing the bootloader on Arduino boards, but the ATTiny88 seems to be rather a different beast. Instead of creating a serial port and sending the compiled code to the ...
-1
votes
0
answers
48
views
How do I generate a SQUARE wave with an Arduino Uno and DDS 9850 module?
I am having difficulty generating a square wave using an Arduino Uno and an AD9850 frequency generator. From what I understand the ZOUT pin should generate a square wave at the same frequency that the ...
0
votes
0
answers
34
views
Arduino R4 webpage not loading
I am trying to create a web page through which I can control the builtin LED of Arduino R4 wifi. I thought since this is basically an ESP32, I could run it but, even though I'm getting the IP address ...
0
votes
1
answer
73
views
Stepper motor not moving
this is my second Arduino project and I am trying to figure out why my stepper motor is not moving. I was able to get a basic 28byj-48 stepper motor to work using stepper.h and some sample code.
Now I ...
1
vote
1
answer
52
views
When I run my for loop the serial monitor is giving very strange results
This is unfinished code for driving a 4 digit 7 segment display. When I run my data function that should output the data to send to the shift register, I get a very weird output.
0 00111111
1 00111111
...
1
vote
1
answer
61
views
Connect ESP32-CAM to L293D
Disclaimer: I'm a programmer, not an electronics expert. I built this car using an Arduino Uno, and now I want to add a camera to it. I’ve tried researching online, but I couldn’t find much ...
-1
votes
1
answer
102
views
MFRC522 RFID RC522 Only Works Sometimes – Unreliable Detection Issue
Problem Overview
I’m using an MFRC522 RFID module with an Arduino Uno, and it only detects RFID tags sometimes. The behavior is inconsistent—sometimes it reads the card instantly, and other times, it ...
1
vote
1
answer
43
views
Using ultrasonic sensors and motors. Measuring and moving at the same time
How to measure distance while controling motors?
I am using an Arduino UNO.
#include <Wire.h>
int motor12pin1 = 2;
int motor12pin2 = 3;
int motor34pin1 = 4;
int motor34pin2 = 5;
int pinJacina12 ...
- 11
0
votes
0
answers
76
views
How to Connect/configure HC05 (Bluetooth module) to a shield?
I am a newbie to Bluetooth communication in Arduino.
I have 2 Arduino boards (one runs my main sw, second act as slave to operate a remote command coming from the main board) that i want to establish ...
0
votes
1
answer
77
views
`sprintf` of %04d and %03x at the same time on Arduino
I have this code, work fine!
uint32_t id , id2;
char s[64]; // Should be enough
...
id2 = id = CAN.getCanId();
sprintf (s, "%04d : ", id ); // !!! HERE !!!
Serial.print(s);
the ...
0
votes
0
answers
78
views
ESP8266 Not Booting Properly on First Power On – Works After Restart
I'm working on an ESP8266-based water level monitoring system using an ultrasonic sensor and an I2C LCD. The problem I'm facing is that sometimes the ESP8266 does not boot properly when powered on for ...
1
vote
1
answer
55
views
Push button isn't pushed but keeps printing or inputting 1/HIGH
I have this Arduino code that will print 1 in the serial monitor and even prints two 1's. I haven't even pushed or clicked the push button, yet it already is already set to HIGH and even activates to ...
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