Arduino - button value changes between 0 and 1 randomly?
I used Arduino to read the state from a button. The reading state changes between 0 and 1 randomly and constantly. The belows are Arduino code and the wiring diagram
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The output on Serial Monitor
How to solve it?
Your problem is known as the floating input problem. When you connect an Arduino pin to a button/switch without using any pull-up or pull-down resistor, this problem will happen.
How to solve
There are three way to solve it with Arduino:
- Use an external pull-down resistor on the Arduino pin ⇒ you need to modify the wiring diagram
- Use an external pull-up resistor on the Arduino pin ⇒ you need to modify the wiring diagram
- Use an internal pull-up resistor on the Arduino pin ⇒ you do NOT need to modify the wiring diagram, you just need to modify the code.
The below code used an internal pull-up resistor to solve the above problem
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