MicroSquirt is a fully-assembled surface mount (SMT) version of the MegaSquirt fuel injection controller and is most like the MegaSquirt-II and V3 main board assemblies. The intended use is aimed at motorcycles, snowmobiles, personal watercraft, and other similar applications. This version includes a longer wiring harness (8', approx 2.4 meters). This also comes with an RS232 serial cable.
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MicroSquirt is basically the same as the MegaSquirt-II/ V3 main board, with the main difference in the injector drivers, MAP sensor which is external to the case, and connectors (the VR circuit is also different).
MicroSquirt also has dual channel ignition logic level outputs as well as both the Variable Reluctor (VR) and optoisolated 'Hall/optical/points' tach inputs.
The bootloader is externally accessible, so there's no need to open the case, even to load new code. And the serial RS-232 signals come out of the AMPSEAL connector (instead of a DB-9 on the front, as with MegaSquirt). The board is sealed in a weather proof enclosure.
Do not forget to order an external MAP sensor!