Arduino FAQs

1How to learn Arduino
2How to use millis() instead of delay()
3How to combine two Arduino sketches
4How to use more GND/VCC pin on Arduino
5Where to ask Arduino question
6Serial.print() vs Serial.println()
7digitalWrite() vs analogWrite()
8Arduino Uno vs Mega
9Arduino Uno Pinout
10Arduino - Button value changes between 0 and 1 randomly
11Arduino - How to detect button press event
12Arduino Pull-up Pull-down Resistor
13Arduino automatically restarts
14Arduino prints float/double variable with decimal places
15How to use external power supply for Arduino
16fatal error: library.h: No such file or directory
17How to pass array to function in Arduino
18How to pass string to function in Arduino
19How to create Class and Object on Arduino IDE
20How to filter noise from sensor
21How to install library on Arduino IDE
22How to uninstall library on Arduino IDE
23How to print an empty line on Serial Monitor
24One button for multiple functions
25Button does not work
26Why needs debounce for button
27Serial Monitor shows weird characters
28LCD does not display characters
29Servo motor does not work
30low memory available, stability problems may occur
31avrdude: stk500v2_ReceiveMessage(): timeout
32How to blink multiple LED
33How to use array of servo motor
34How to use push-button as on-off switch
35How To use special character on LCD
36How to use button to start/stop the loop
37How to use button to start program
38How to use the multiple passwords for keypad
39How to use more digital pins on Arduino Uno
40How to use buzzer without blocking other code
41How to debounce for multiple buttons
42How to input a multiple digits number using the keypad
43How to control speed of servo motor
44How to add a header file on Arduino IDE
45How to convert string variable to integer in Arduino
46How to reset Arduino by programming
47How to know value of resistor
48How to fade LED in a time period
49How to connect multiple SPI sensors/devices with Arduino
50How to connect multiple I2C sensors/devices with Arduino
51How to know I2C address of sensor/device
52How to dectect presence/absence of something
53How to vertical and horizontal center align text/number on OLED
54How to connect two Arduino directly via Ethernet cable
55How to make the wiring tidy, neat, and firm
56How to debug Arduino code
57How to delete code on Arduino board
58How many LED/relays can Arduino control
59avrdude: ser_open(): can't open device
60DS3231 vs DS1307
61error: expected ',' or ';' before
62error: 'variable' was not declared in this scope
63Switch Case statement does not work correctly
64Stepper motor moves slowly
65What is Serial.println(F(""))
66Is It possible to read the code from Arduino board
67Arduino code does not work when switching from USB to power supply

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