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
GPIO 4 enable MQTT: Enable MQTT publishing/subscribing
GPIO 4 enable HTTP: Enable HTTP write/read
GPIO 4 name: MQTT topic name (empty = GPIO4). Allowed characters: a-z, A-Z, 0-9, _, -.

Parameter IO4