How to emulate push button switch to ground

[bojan]

Hello!

I would like to emulate a push button switch to ground. I can do that with this :

pinMode(powerButton, INPUT);
digitalWrite(powerButton, LOW);
pinMode(powerButton, OUTPUT); // Pull the signal low to activate the power button
delay(100);
pinMode(powerButton, INPUT); // Release the power button.

BUT, can I do that with EspEasy?

[grovkillen]

What do you mean? Please explain more...

[ThomasB]

I would like to emulate a push button switch to ground. I can do that with this : {snip}

Please review the GPIO commands explained here:
https://www.letscontrolit.com/wiki/index.php/GPIO

I see that you require the emulated switch to be Hi-Z when not active (driven low). So the built-in GPIO pulse command cannot be used. The workaround is to use discrete GPIO commands and a system timer. Unfortunately the system timer only has 1000mS resolution so the switch will be active for 1 second minimum.

Here is a set of rules that will activate GPIO14 by calling Event SendSwitch

Code: Select all

on System#Boot do
   GPIO,14,2  // Hi-Z GPIO 14
endon

on Rules#Timer=4 do
   GPIO,14,2  // Hi-Z GPIO 14
endon


on SendSwitch do
   timerSet,4,1
   GPIO,14,0
endon

My example uses GPIO-14, which is a unused pin on the Sonoff Basic. However, you'll need to specify a suitable GPIO for your ESP8266 hardware.

Important: Do not connect anything directly to a GPIO pin that could drive the pin higher than 3.3V. Otherwise the ESP8266 can be damaged.

- Thomas

[bojan]

Thank you Thomas, that will probably do the trick. Just to be clear: I would like to parallel connect the ESP GPIO to the LED controller push buttons.

2018-12-10 19.13.39.jpg (469.63 KiB) Viewed 3825 times

Also, thanks for 3.3V tip. I will have to use the level shifter.
BR
Bojan

[ThomasB]

Instead of a typical level shifter you could use a simple NPN or FET transistor buffer circuit. This would allow you to use the GPIO Pulse command which would simplify your rules and allow 100mS switch On times.

- Thomas

[bojan]

Yes, that is probably the simplest solution. Thanks a lot.
Bojan