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MicroSquirt® Access Board

For MicroSquirt® EFI controllers, we have made a simple "access" board, similar to the relay board for MegaSquirt (but that also includes some of the diagnostic LEDs of the simulator). They will be conformal coated, and these will be an assembled unit like the MicroSquirt. It is in the same form factor as the relay board (3 x 5 inch) and slides into the same LMB-Heeger EAS-200 case with a minor amount of 'clearancing' for the AMPSEAL connector (the two won't easily fit in together). You can purchase the case from HdB Electronics (650-368-1388) in single unit quantities. There are also mounting holes in case users want to mount the access board using standoff spacers.

Designed to be mounted under the hood, there are the same screw terminals like the ones on the relay board. Also, there is a MAP manifold absolute pressure sensor (the MPX4250AP used for MegaSquirt) and a DB-9 serial connector for connecting to a laptop computer for tuning with MegaTune. The input is the 35-pin Ampseal, the pin assignment is identical to MicroSquirt® (i.e. pin 1 goes to pin 1, etc.).

The Access board kit will come with the an Ampseal plug and 35 wires with the terminals crimped on each end to allow the end user to assemble the Ampseal connector - this way the user can pass the wires through a smaller hole in the firewall, and build it up on the vehicle.

There are also diagnostic SMD (surface mount device) LEDs for the usual output items:

Also, the power and signal (and serial) grounds are maintained as separate electrical paths on this board.

The 8-position DIP switch lets the user apply the opto ground return, pull-ups for the opto+ to +12 or +5 for use with EDIS, TFI, and other ignitions. Also the on-board MAP runs through the DIP switch - it can be disabled and the user then will run his own external MAP and hook up to the MAP terminal block. Finally, the bootloader switch is on the DIP switch as well.

MegaSquirt® and MicroSquirt® controllers are experimental devices intended for educational purposes.
MegaSquirt® and MicroSquirt® controllers are not for sale or use on pollution controlled vehicles. Check the laws that apply in your locality to determine if using a MegaSquirt® or MicroSquirt® controller is legal for your application.
©2007 Bruce Bowling and Al Grippo and Lance Gardiner. All rights reserved. MegaSquirt® and MicroSquirt® are registered trademarks. This document is solely for the support of MegaSquirt® boards from Bowling and Grippo.