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* Step motors and limit switches are wired to corresponding terminals on the microcontroller board, which is connected to [[Linux]] computer with a USB cable.
* Step motors and limit switches are wired to corresponding terminals on the microcontroller board, which is connected to [[Linux]] computer with a USB cable.
* The board is powered with a recycled computer power supply.
* The board is powered with a recycled computer power supply.
* To control the welder we use one of these [http://www.sainsmart.com/4-channel-5v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html relays] attached to the RAMPS auxiliary i/o and power pins. Changing the state of the pins to which the board is attached changes the state of the relay assigned to the activated pin. The relay contacts are then wired in parallel with the trigger switch in the handle of the welding gun. Toggling the handle trigger or the relay will toggle the welder. This way the welder can still be used as it normally would when not attached to the printer...
== Safety ==
== Safety ==
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