Can the IFI Spike relays (http://www.ifirobotics.com/spike.shtml) be used with the Vex Controller?
Yes, the Vex Controller is compatible with the IFI Spike Relay Module. The Spike control signals (PWM cable) must be connected to the Vex Controller Analog / Digital Outputs. The 3 wire PWM cable going to the Spike Relay Module must be modified because the Spike needs 2 control lines (inner and center) and 1 ground (outer) pin. The Analog / Digital Output 3-wire connection consists of 1 control (inner), 1 power (center), and 1 ground (outer) in a single row strip. Since the Spike expects a control signal on the outer white wire and the center red wire, the center red wire must be move to a digital output pin (wire colors based on our PWM cables). A direct connection without modification would connect the red center control wire to power and the Spike would not function properly. Also the sex of the PWM connector must be swapped from female to male which can be done using a 3 pin header. Call us if you are ordering a Spike relay and need a 3 pin M-M header.