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param-docs/parameter-pages/GPIO/IO4.md
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# Parameter `IO4`
Default Value: `built-in-led disabled 10 false false`
!!! Warning
This is an **Expert Parameter**! Only change it if you understand what it does!
This parameter can be used to configure the GPIO `IO4` pin.
!!! Warning
This pin is only usable with restrictions!
By default, it is used for build-in flash light (onboard LED).
Parameters:
- `GPIO 4 state`: One of `built-in-led`, `input`, `input pullup`, `input pulldown` or `output`.
- `GPIO 4 use interrupt`: Enable interrupt trigger
- `GPIO 4 PWM duty resolution`: LEDC PWM duty resolution in bit