Temp + / - via Hardware Buttons

[cottec]

To allow easy adjustment of temperature for switching between different coffee roasts without a smartphone it would be handy to have hardware controlled buttons on free pins using the ESP32 built in pull up/down

pinMode(pin, INPUT_PULLUP);
pinMode(pin, INPUT_PULLDOWN);

pins could be 5&17 (next to each other on the board an unused for pidonly)
if routed outside the machine, combined with a display, it's ground connection might be ideal for using pull-down as the positive input could be +5V which wouldn't be healthy for the board

[endym]

In fact I've implemented such feature already. This branch is running fine in my Rancilio Silvia E with a NodeMCU. Here you can see a short video of (not the latest) display menu.
However, this branch is based on the current master (version 2.9.4). The current "next version" development branch differs very much meanwhile, so an integration will require some effort.

[fiendie]

This should probably be closed as the new hardware only has support for rotary encoders.

[endym]

I do not know the new hardware, but wondering that no two GPIOs are free?

[fiendie]

The rotary encoder uses 3, so in theory those could be repurposed.

[SphaeroX]

Pin 14 and 12 free.

These two pins are so called touchpins which means you can make an input by touching them.

Here is a video: https://youtu.be/4YY7TutRrQE?t=196

With this you could also build a control where you can select left and right and if you hold the right button longer you can set a value (flashes then).

[LoQue90]

there is a wip PR #419 to add a menu on the display with a rotary encoder. It´s allready posible to change the temperature with this menu. Try it out. :)