MicroSquirt^® encapsulates pretty much everything that MegaSquirt^® has to offer, in a board the size of a business card. It would be nice to have this package for a true DIY setup…

For real engine experimenters, the MicroSquirt^® PCB is offered in a module format - The MicroSquirt^® Module. Retailing for $249 (as of this writing), the MicroSquirt^® Module is intended to be used to plugged into other boards, to let others add things like:

• USB connectivity,
• Bluetooth or Zigbee wireless,
• On-Board MAP and Baro sensors,
• On-Board stimulators for diagnostics,
• Use of Wide Band O2 sensor modules,
• Connectors for direct plug-in (EEC-IV, L-Jet, GM, etc.),
• Multiple modules for redundant setups, auxiliary fuel injectors, dual-fuel setup (gasoline+CNG), extended GPIO, etc.

There are some potential add-on circuits for the MicroSquirt^® Module described here.

The MicroSquirt^® Module has exactly same circuits as MicroSquirt^® (except ignition drivers, which are logic-level output only). Module is only 2.4 inches wide by 3.5 inches long – credit-card sized! The Ampseal 35-pin connector is replaced with a 0.1” header, with two rows of 25 pins (25x2). All input and output connections are present on this header.

You can find the MicroSquirt^® Module schematics here:

• MicroSquirt^® Module Schematics

MicroSquirt^® Module J2 25x2 Header Pin-out:

MicroSquirt^® Module J1 5x2 Header Pin-out:

Additional processor I/O brought out on J1 5x2 header (J1):

Also available for the MicroSquirt^® Module is a standard adapter board, the "MicroSquirt^® Utility Board" that connects the 25x2 header to terminal strips to allow a very compact, easy to connect package for the module:

  

This board mounts to the mounting holes in the module, using stand-offs:

Notes:

1. The female 25x2 receptacle goes on the processor side of the MicroSquirt^® Module (the side with all the SMT components on it).
2. The header for the utility board has 26 pins (2x13 headers). To line up the pins, the extra pair of pins goes to the 'GND Pwr' 4 position terminal block/'proto' end of the board assembly, so the connections are correct and the board mounting holes line up.