killbutton [smoothieware.org]

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= Smoothie kill button

There are two solutions:

=== LED Tactile Button

Solder [[https://www.sparkfun.com/products/10442|Led Tactile Button]] on the smoothieboard 

{{://killbutton/led_tactile_button.png?direct}}

=== Simple Button

Wire a simple button on two pin

{{://killbutton/simple_button.png?direct}}

The button may be configured as a kill switch, this will halt all operations and turn off heaters and pause the host. It can be cleared with a M999 or reset. to enable a kill button the following is added to the config...

<code>
kill_button_enable                        true             # set to true to enable a kill button
kill_button_pin                           2.12             # kill button pin. default is same as pause button 2.12 (Add ^ for external buttons)
</code>

When in the halted state (after kill button is pressed) the play led will flash rapidly. Kill can be cleared by holding down the kill button for 2 seconds or more.

Alternatively a latching E-Stop button can be hooked up to the kill button header (usually normally open). Then use this config...
<code>
kill_button_toggle_enable        true                # allows for latching estop button
</code>

When the Estop button is hit and latched on it will Halt the system, when it is unlatched and released the system will exit the Halt condition. 

If you do not want Halt to exit when it is released then set this...

<code>
unkill_enable     false                # do not unkill when button held or released
</code>

Note : If your kill button is "Normally Closed" ( NC ), then that means it will be pressed at boot time. By default, the bootloader reads the 2.12 pin at boot time and if it is closed, will enter DFU mode. This means that you can not use pin 2.12 for a normally closed kill button as it will prevent the board from booting normally. The solution is very simple : just use any other pin, and edit the configuration accordingly.

{{page>stopping-smoothie}}