MegaSquirt 2Extra Скачать руководство пользователя страница 11

Страница: 11 / 18

Following section is from http://www.msextra.com/doc/ms2extra/MS2-Extra_4g63.htm:

Output Mods for V3.0 PCB

Spark Invert mod from http://www.miataturbo.net/megasquirt-18/better-spark-out-circuit-33964/

The solution is to configure the spark outputs such that they are on when the CPU’s output pins are on,

and off when the CPU’s output pins are off. We could achieve this by using a PNP transistor on the CPU

output pin (PNPs have the opposite control polarity of NPNs)

(edit: no, that wouldn't work)

however since

NPNs are already a part of the the modkit packages of the various distributors, I’ve chosen a route which

will achieve the same results at the same cost, without requiring that new devices be added to anybody’s

inventory.

So essentially what I have done is to place a second set of NPN transistors after the first set, to un-invert

the signals which Q6 and Q8 have inverted:

Содержание 2Extra

Страница 1: ...htm 3 Start the build by soldering in the 2 connectors 37pinned and 9 pinned items 4 Next get all the bags of resistors together keeping them in the bags R1 etc Find R12 R37 R38 R43 R39 and R57 Put t...

Страница 2: ...h these diodes as you may need them FIdle output mods Note D1 may need installing if your using a coil ve triggering setup 8 Now solder the 4 holes up on the main board for D1 and D2 so you don t acci...

Страница 3: ...ou re NOT using the coil ve as the trigger input Fuel only find C30 and put it out of the way 14 Solder the 2 holes up on the main board for C30 so you can t fit a capacitor into the holes by accident...

Страница 4: ...underneath Solder in MOV1 looks like a big round capacitor Not shown installed in this photo 17 Now find the bag with all the chips in it U6 U3 U7 and U4 Solder these in place be careful to get them...

Страница 5: ...tal strip heatsink in place and start fitting the main power transistors remembering Q9 and Q12 have a piece of mica insulation under them to stop them touching the heatsink Note you can put a screw t...

Страница 6: ...move about 21 You can now fit all the other components except for those that you put to one side I fit the MAP sensor last don t forget to bolt it in place with the plastic screws then solder it in o...

Страница 7: ...component on the heat sink later on in the build Remember that without these current sense resistors there is no over current protection on the injector circuits Note I installed R37 and R38 23 R43 is...

Страница 8: ...then put the ve probe on the 0V on the proto area and put the ve probe onto the left pin of U5 top left hand side on heatsink check the voltage on the meter it should be 12V 9V if using a battery if...

Страница 9: ...omponents Q4 Q20 and R39 in place Note this gives you a programmable output that can drive a relay e g cooling fan on FIdle Pin 30 of the db37 ii PWM Idle Valve MS1 or MS2 2 3 wired devices need a TIP...

Страница 10: ...Hall input covers all inputs like VAST EDIS PIP GM HEI etc See the specific manual for you re engine s input to find out if it s 5V or 12V If in doubt measure the voltage with the engine stopped and...

Страница 11: ...e off We could achieve this by using a PNP transistor on the CPU output pin PNPs have the opposite control polarity of NPNs edit no that wouldn t work however since NPNs are already a part of the the...

Страница 12: ...S board so Spark A goes to pin 31 and Spark B goes to pin 36 http www miataturbo net megasquirt 18 ms2 standalone stock ignitor 70414 As you can see we re using the natural pullup of the existing LED...

Страница 13: ...pinned microprocessor for MS1 or a daughter board for MS2 into the 40 pin connector Plug the ECU into your stim and turn the power on Feel the top row of power transistors if they get hot at all turn...

Страница 14: ...picture below shows the modification which connects pin 1 of the NAND gate chip U2 on the MS2 card to pin 4 of the 40 pin header and pin 4 of U2 to pin 5 of the header With that modification pins 3 a...

Страница 15: ...location closer to the header pins and more space to solder jumpers The black lines in the schematic below show the new jumpers connection It should be noted also that the CPU pins corresponding to in...

Страница 16: ...not interfere with injector channels 1 and 2 The injectors channels 3 and 4 connect to pads originally used for the MS1 clock circuit and require the removal of those components for proper and safe o...

Страница 17: ...and should be taken from a fused source from the main relay Signal GND should connect to Megasquirt sensor ground If present Power GND should connect to the engine block along with the other Megasquir...

Страница 18: ...rcuit on the prototype area of the mainboard and connect your MAF signal into the case through a spare pin on the DB37 connector e g One of SPR1 2 3 4 if they are free BM Note I chose SPR2 normally al...