The GPIO Board from Bowling and Grippo

This is the site of the MegaSquirt-II™ CAN-enabled GPIO board from Bowling and Grippo. This board uses CAN networking to communicate with MS-II™ to greatly extend the available inputs and outputs.

Some notable aspects of GPIO board are:

• The GPIO board has the HCS12 C64 processor and CAN (controller area network) chip, which are identical to those on MegaSquirt-II™ (other than a R82 120 Ohm termination thru-hole resistor), and a separate serial connection.

• The GPIO board is designed so that more than one can be used. In fact, up to 15 CAN enabled boards (GPIO or router boards) can be used with MegaSquirt-II™, giving a very large number of possibilities.

• There are 3 types of input circuits and 3 types of output circuits. These are:
  • Inputs
    1. 5 general purpose inputs [GPIx], which can have voltage or resistance input, depending on build-time options (based on the V3 sensor input circuits), these can also be used for software debounced on/off switches,
    2. 4 VR inputs [VRx] (based on Bruce's EasyVR schematic), for things like transmission controller, vehicle speed indications, or traction control,
    3. 4 EGT circuits [EGTx] (using AD595 chips), for independent exhaust gas temperature measurements. (These can also be configured for resistance or voltage measurements, similar to the GPIx circuits)

  • Outputs
    1. 4 general purpose outputs [GPOx] (which have user selected 5V or 12V pull-ups, flyback, and LED capabilities),
    2. 4 PWM outputs [PWMx] (based on the uprated V3 PWM FIdle TIP120 circuit),
    3. 4 high current circuits [VBx], using the VB921 ignition module driver.

For more information, please select from:

• GPIO Discussion Forums
• GPIO Hardware: Hardware description and technical tips on the GPIO board.
• GPIO Applications:
  • MegaShift: A DIY automatic transmission controller for the GPIO board.
  • DIY GPIO Code: This is a code template for writing your own code for the GPIO board.
  • ... more to come!