User inputs

It is often useful to have a few button inputs on a machine. The simplest way to get these are to use a few input pins on the FluidBoard. However, since these are commonly used for probing, alarms and endstops, it is advisable to use a separate input board for user inputs (through the UART connector). Pendants are a good example of this.

We here only discuss physical connections on the input pins.

Wiring

Wire inputs to the input terminals of the board. The input terminals are isolated and opto-coupled, and can handle 5v inputs. In most cases, one side of the push button is connected to a GND, and the other to an input.

Do not wire any 5v terminal to the isolated 5v terminal of the inputs, and do not wire the GND of the inputs to any other GND. This will void the isolated output and can cause damage.

We recommend using the 'stop' input for the emergency stop.

Configuration

The configuration of inputs is per input. Depending on NPN or PNP, you might need to use :low as a flag on the gpio, to invert the input. For example:

control:
  safety_door_pin: gpio.17
  reset_pin: NO_PIN
  feed_hold_pin: gpio.48:low
  cycle_start_pin: NO_PIN
  macro0_pin: gpio.18:low
  macro1_pin: NO_PIN
  macro2_pin: NO_PIN
  macro3_pin: NO_PIN
  estop_pin: gpio.16