Arduino FAQs

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

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