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add chapter with GPI0 variants _n _in _id _d #1216

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add chapter with GPI0 variants _n _in _id _d #1216

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add chapter with GPI0 variants _n _in _id _d
ouinouin Apr 13, 2023
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active high/low swapped
ouinouin Apr 14, 2023
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16 changes: 16 additions & 0 deletions docs/Buttons-and-Switches.md
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Expand Up @@ -4,6 +4,22 @@ A typical device usually has at least one button (exception being bulbs and some

!!! note
Other than relays/lights, Tasmota does not publish the state of components (switches, buttons, sensors, etc.) in real-time. State of components is transmitted automatically each [TelePeriod](Commands.md#teleperiod) via the `SENSORS` message.
# Choose GPIO configuration
All board are not born equal so does your own diy realisations, you might have choosen to put your own pull-up resistors , or had an inverted logic on your button input.
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The first thing is to correctly select the Button or Switch variant accordingly in the "Configure module" or "Configure template" menu.
the variants supported by ESP8266 are following :
* Button : Button active low, internal pull-up resistor
* Button_n : Button active low, no internal pull-up resistor (_n like NoPullUp)
* Button_i : Button inverted, active high with internal pull-up resistor
* Button_in : Button inverted, active high no internal pull-up resistor (_in like Inverted NoPullUp)
* Switch : Switch with internal pull-up resistor
* Switch_n : Switch without pull-up resistor

the ESP32 supports all forementionned variants plus :
* Button_d : Button with internal pull-down resistor
* Button_id : Button inverted, active low with internal pull-down resistor
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* Switch_d : Switch with internal pull-down resistor

# Button vs. Switch
A button (also called a push-button) is a momentary or non-latching switch which causes a temporary change in the state of an electrical circuit only while the switch is pressed. An automatic mechanism (i.e. a spring) returns the switch to its default position immediately afterwards, restoring the initial circuit condition.
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