Curriculum
Push Button With Led
project 2 - LED Blink with Push Button
0/6
Project 2 - Do on Your Self
0/5
Text lesson
Output
Output
Expected Output
- Press Button → LED ON
- Release Button → LED OFF
Student Observation
- Arduino internal resistor works automatically.
- No external resistor needed for button.
- INPUT_PULLUP uses reverse logic.
Important Note
Why LOW when button is pressed?
Because:
- Pin is normally connected internally to HIGH.
- Pressing button connects it to GND.
- So Arduino reads LOW.
when Arduino Uno starts up
forever
set
buttonstate
to
read digital pin
2
if
buttonstate =
1
then
set digital pin 13 output as high
else
set digital pin 13 output as low