2022 Developer Survey is open! Take survey.

Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. It only takes a minute to sign up.

Sign up to join this community
Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top
Arduino

Top Questions

Ask Question
Active Hot Week Month
1 vote
0 answers
13 views

error: 'MonoOutput' has not been declared (Mozzi library, Arduino Nano)

user avatar
apophene
  • 19
-2 votes
1 answer
30 views

My Atlas Scientific sensors measurement give zero values at first reading

user avatar
Majenko♦
  • 101k
2 votes
1 answer
46 views

How to perform multitask using arduino such as update data as well as check condition?

user avatar
Majenko♦
  • 101k
-1 votes
1 answer
34 views

What are these 18 extra ports on the adafruit-gfx 2.8"

user avatar
Majenko♦
  • 101k
0 votes
1 answer
50 views

How to toggle a pin (LED) simply

user avatar
Majenko♦
  • 101k
1 vote
3 answers
132 views

How to do multiple serial.read()

user avatar
Juraj♦
  • 16.1k
-2 votes
0 answers
37 views

16x2 LCD display showing a line down centre of screen and nothing else

user avatar
poxyping
  • 1
1 vote
1 answer
33 views

What is the build-in LED pin for the ESP32-WROOM-32D dev board?

user avatar
adamaero
  • 175
0 votes
1 answer
35 views

How to append to array of Strings in arduino?

user avatar
Edgar Bonet
  • 35.5k
-2 votes
0 answers
41 views

Why do I get those warnings?

user avatar
jsotola
  • 1,130
-1 votes
0 answers
17 views

Can't use Bluetooth or WiFi on ESP32

user avatar
Jaedson Silva
  • 1
1 vote
1 answer
30 views

Apparently the photoresistors don't pass the input at the leds

user avatar
Juraj♦
  • 16.1k
0 votes
0 answers
25 views

relay issue at boot in wemos d1 r1

user avatar
dave
  • 3
-1 votes
1 answer
25 views

ESP32 Potentiometer issue: Resolution mismatch of the potentiometer with unlimited resolution and reading the values with Wire.h

user avatar
Sim Son
  • 1,789
-1 votes
0 answers
21 views

Unable to edit code on Leonardo

user avatar
yesimaperson55665
  • 9
0 votes
1 answer
24 views

Cannot make attachInterrupt work

user avatar
Bra1n
  • 853
0 votes
1 answer
25 views

Adjusting Threshold for Digital Pins

user avatar
chrisl
  • 13.7k
0 votes
0 answers
28 views

Pro micro not recognized when connected to USB

user avatar
kamal951
  • 1
0 votes
0 answers
12 views

Help with Arduino sleep and watchdog timer interrupt

user avatar
phizaics
  • 1
-1 votes
1 answer
25 views

ESP32 flash memory

user avatar
Sim Son
  • 1,789
1 vote
1 answer
62 views

Generalize webserver routing

user avatar
chrisl
  • 13.7k
-1 votes
0 answers
11 views

How can I reference non-standard pins for my air sensor? [duplicate]

user avatar
user1505631
  • 99
-2 votes
0 answers
20 views

Arduino PCB order [closed]

user avatar
박광렬
  • 41
0 votes
1 answer
36 views

How often does a mpu6050 gyro sonsor need calibration?

user avatar
st2000
  • 6,451
-1 votes
0 answers
19 views

Validate data entry in arduino

user avatar
Juraj♦
  • 16.1k
-3 votes
1 answer
37 views

i download a file that has ino but when i extract it is gone [closed]

user avatar
Juraj♦
  • 16.1k
-1 votes
0 answers
24 views

How to reset a main loop, by clicking on specific button on keypad?

user avatar
user851242
  • 9
0 votes
0 answers
16 views

RA-02 LoRa transfer problem

user avatar
Arad
  • 1
0 votes
0 answers
23 views

5v circuits protection [closed]

user avatar
Safari
  • 101
1 vote
1 answer
73 views

Arduino create Json Array with double values and 2 decimal point

user avatar
Edgar Bonet
  • 35.5k
-2 votes
0 answers
28 views

My 1 digit segment display shows half of what it should display [closed]

user avatar
youlikecodingstackoverflow
  • 1
0 votes
1 answer
31 views

Round to first significant digit

user avatar
Edgar Bonet
  • 35.5k
-1 votes
0 answers
22 views

MicroSD card module not working [closed]

user avatar
buf
  • 1
-2 votes
0 answers
33 views

Getting twice the expected frequency in PWM generation using digitalWrite() [closed]

user avatar
Adarsh TS
  • 1
0 votes
3 answers
39 views

How do you deal with balancing the limited storage of Arduino with the decrease in speed if you just print everything as it gets measured?

user avatar
Gil
  • 1,416
-2 votes
0 answers
15 views

SIM900 GSM SHIELD with nodeMCU pins [closed]

user avatar
codeRObz
  • 1
-2 votes
0 answers
22 views

Connect MAX30100 directly with ATmega328p without using Arduino [closed]

user avatar
user85157
  • 1
1 vote
0 answers
31 views

FastLED changing colour at holding state

user avatar
entirelyreverse
  • 11
-1 votes
0 answers
30 views

Why is Arduino IDE+ Debug automatically closing

user avatar
TMK
  • 99
0 votes
1 answer
44 views

USB-C to USB-C cable Arduino is not responding even not powered by this cable

user avatar
Majenko♦
  • 101k
-2 votes
0 answers
33 views

Can't store data in array [closed]

user avatar
ocrdu
  • 1,575
-1 votes
1 answer
46 views

Can't get input from 4x4 keyboard

user avatar
chrisl
  • 13.7k
-2 votes
1 answer
26 views

Powering LEDs with Arduino uno 5v

user avatar
Gil
  • 1,416
0 votes
0 answers
27 views

ESP-32S NodeMCU - Unable to upload sketch

user avatar
LordOptimistic
  • 1
1 vote
1 answer
44 views

Connecting various devices to Arduino

user avatar
chrisl
  • 13.7k
-2 votes
0 answers
20 views

How to control current to charge batteries? [migrated]

user avatar
Musa
  • 143
0 votes
0 answers
41 views

Something in my code is causing incorrect and spammed keystrokes [closed]

user avatar
Alex And Freinds
  • 1
-1 votes
0 answers
22 views

Can't pass value to the integers in function [closed]

user avatar
user851242
  • 9

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.