| CARVIEW |
Select Language
HTTP/2 200
date: Sun, 27 Jul 2025 14:03:52 GMT
content-type: text/html; charset=utf-8
cf-ray: 965caec46d6195be-BLR
cf-cache-status: DYNAMIC
cache-control: private
set-cookie: prov=e35db79e-93e0-4efd-af81-f9684aed8f88; expires=Mon, 27 Jul 2026 14:03:52 GMT; domain=.stackexchange.com; path=/; secure; httponly
strict-transport-security: max-age=31536000; includeSubDomains
vary: Accept-Encoding
content-security-policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com
x-clacks-overhead: GNU Terry Pratchett
x-frame-options: SAMEORIGIN
x-request-guid: 8e42a5b9-4214-416a-9de4-4c845a9eae32
x-worker-origin-response-time: 465000000
x-dns-prefetch-control: off
set-cookie: prov=e35db79e-93e0-4efd-af81-f9684aed8f88; Path=/; HttpOnly; Domain=stackexchange.com
set-cookie: __cf_bm=caMxOEQv2ELcn9Pt_r5lB0Y9bz3UCNGUqEt5O3nl7DY-1753625032-1.0.1.1-d.2M0aZoFCm0tRAVdqFNiWr.zArR7bpq.33SZST__9l9TFKn42b_qkVIpaE_MjnZZiogD_ZPCImmmxs7WxYqYvRB.2B0reFatkuz0YBIEos; path=/; expires=Sun, 27-Jul-25 14:33:52 GMT; domain=.stackexchange.com; HttpOnly; Secure; SameSite=None
set-cookie: _cfuvid=HySuI6alX_x5GJ3EfIlk9XlYLWmuSBK5pEzxzzDu4rU-1753625032866-0.0.1.1-604800000; path=/; domain=.stackexchange.com; HttpOnly; Secure; SameSite=None
server: cloudflare
content-encoding: gzip
Newest 'arduino-leonardo' Questions - Arduino Stack Exchange
Skip to main content
Stack Exchange Network
Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Visit Stack Exchange
Teams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
Learn more about TeamsQuestions tagged [arduino-leonardo]
An Arduino board based on the ATmega32u4 chip with built in USB HID functionality
332 questions
- Bountied 0
- Unanswered
- Frequent
- Score
- Trending
- Week
- Month
- Unanswered (my tags)
0
votes
0
answers
5
views
Can one re-program a Leonardo Eth via its Ethernet port only?
Let's assume we have an Arduino Leonardo Eth running some sort of networking application, perhaps a very simple web server. Importantly the server is read only and static HTML. There is no ability to ...
0
votes
0
answers
35
views
Need Help Communicating with Arduino Leonardo Using Custom Bootloader
I have an Arduino Leonardo that has been flashed with a custom bootloader, and it currently has a sketch on it that I cannot replace or modify because doing so would brick the board. The board works ...
2
votes
2
answers
820
views
How can I stop digital pins from floating at reboot?
I've got a LattePanda 3 Delta, which runs windows on its main processor and an Arduino sketch called StandardFirmata on its coprocessor. It's connected to a lock, which locks at HIGH and unlocks at ...
0
votes
1
answer
76
views
atmega32u4 connect PC
I made a custom PCB with C-type USB and atmega32u4 (arduino leonardo). But my PC doesn't recognize the atmega32u4.
Here are my schematic.
Why my PC doesn't recognize the pcb in schematic?
-1
votes
1
answer
135
views
Joystick library not reading potentiometer
I am using Joystick Library to make a HOTAS system for flight simulators. When I load the test program I can get all the simulated controller inputs to register in windows. I can also get the value ...
0
votes
1
answer
3k
views
Change USB VID and PID (Leonardo)
I'm new to using electronic boards, and have followed a guide online for printing a 6 DoF (degree of freedom) mouse. I'm stuck on an optional step that requires me to change the PID and VID of a "...
-1
votes
1
answer
113
views
Arduino Leonardo Key Detector
I want to make an arduino code on the arduino leonardo that detects when keys are being pressed and to print them to the serial monitor so I can control the arduino with the computer keyboard. I need ...
-2
votes
1
answer
85
views
L LED on Arduino is constantly on and com is not detected
When I connect the Arduino to the computer, the L LED is constantly on and com is not detected. However, when I press the reset button, the L LED starts blinking for about 10 seconds and com appears. ...
-1
votes
1
answer
56
views
Arduino pin erratic behavior?
I've built a switch key matrix (thus the diode, contextually useful schematics below) and me being me, I realised after that I misunderstood a few things about how button really works, to say the ...
-1
votes
2
answers
670
views
Arduino Pro Micro not recognizing INPUT or INPUT_PULLUP
I tried to make a controller box with multiple buttons. Sadly, when I tried to connect the buttons, the Arduino Pro Micro didn't recognize them being pressed. I even tried to connect a wire directly (...
2
votes
1
answer
178
views
Improving moving mouse loop to optimize speed
Code:
#include <Mouse.h>
#include <hiduniversal.h>
#include "hidmouserptparser.h"
#include <USBController.h>
USBController controller;
USB Usb;
HIDUniversal Hid(&Usb);
...
1
vote
0
answers
156
views
Cannot change fuses on ATmega32U4
I have a custom board based on Arduino Leonardo (ATmega32u4).
As usual I used the Arduino IDE to burn the bootloader with my Atmel ICE ISP programmer.
This time it failed complaining about some errors ...
1
vote
1
answer
1k
views
help with error: cant open device "\\.\COM6":Access is denied
I built a new pc which I use as a flight simulator. On my old PC I had ArduinoIDE for programming a pro micro as well as a teensy 4.1 using the teensyduino library. I installed all the necessary ...
0
votes
0
answers
284
views
Atmega32u4: Reduce power consumption while keeping USB active
I have a USB powered board, that should consume as little power when idle as possible, while keeping the USB connection alive.
The device only sends data to the host, doesn't receive any, so the ...
1
vote
0
answers
588
views
Arduino lagging or buggy with delays and serial print?
I got a strange issue with my Arduino Leonardo (clone). It seems to be laggy or buggy, I don't know what the issue is.
I get issues when I use "long" delays.
Below sketch is working fine.
...
- The Overflow Blog
-
-
- Featured on Meta
-
-
Related Tags
serial × 41
usb × 35
arduino-uno × 32
atmega32u4 × 30
arduino-ide × 25
arduino-pro-micro × 24
keyboard × 21
bootloader × 17
programming × 15
uploading × 15
bluetooth × 13
power × 11
c++ × 11
arduino-micro × 10
avrdude × 9
arduino-mega × 8
motor × 8
led × 7
i2c × 7
timers × 7
library × 6
pwm × 6
analogread × 6
softwareserial × 6
sensors × 5
more related tags
Hot Network Questions
- Can Spi flash memory's contents be corrupted from heat?
- Not being introduced to the team – should I ask for it?
- Heretofore I think I have been using 'heretofore' incorrectly
- Blinded despite Blindsight?
- Early Sailing days in September 1066... Could Harold defeat William at Hastings, if it happened before Stamford Bridge?
- Will a reinforced 1" concrete slab be durable?
- When was the last time all humans were on the ground not in the air?
- Class for validating code in different Conda environments with PyTorch
- Why am I winning always? A coincidence perhaps?
- How can I turn the text in a PNG file back into text layer?
- Will this work as an XOR gate?
- Easy ways to draw vector diagrams in TikZ?
- What does "enter the hold at arden" mean
- "I met a monk and philosopher." How many people did I meet?
- Did Denmark report that 64% Palestinian refugees from 1992 received serious fines or jail time?
- How to navigate in the Universe's Heat Death
- Were the Fantastic Four the only superheroes on Earth-828 in The Fantastic Four: First Steps?
- Alternative to tedious assert-rewrite for trivial operations?
- I don't have enough alive employees to start the day. What now?
- edge to curve endpoint move/transform to normal direction
- Extensions of diagonalizable, respectively multiplicative-type, groups
- How do we know in capillary rise fluid eventually stops rising?
- Forces applied to a car hood while driving
- What is the citation for Augustine's "consensus, non concubitus..."