DIYPNP V1.1 Documentation, Assembly, and
Implementation Guide
(For v1.5 DIYPNP
Assembly Instructions click here)
The DIYPNP board lets you build your own
plug and play engine management systems. The core of the DIYPNP
kit is a MicroSquirt module that plugs into an expansion
'mainboard' with on board circuits for many features, including
direct coil control, boost control, knock control, and several
general purpose inputs and outputs. You assemble this board and
jumper it to a 'connector board' which includes a connector to
plug into your existing wiring harness. Now you no longer have
to solder together awkward adapter harnesses, or hack up a
factory ECU case to get a build-it-yourself, plug and play
MegaSquirt ECU.
Note that for the purposes of this
documentation most of these directions assume you will be
running MS2/Extra code, version 2.1.0 or higher.
Some boards have extra components on the
adapter board that you may want to assemble as well. See these
pages for adapter boards with special components.
Overview
First, let's go over the features.
At the core of the board is a MicroSquirt Module board.
This includes the processor, many of the sensor conditioners,
and two injector drivers, each injector driver capable of
running one low impedance or four high impedance injectors.
The main board that the MicroSquirt Module
bolts to adds several new circuits of its own to provide you
with all the features you need to run many popular engines, and
room to add more circuits if you need something not originally
on the board.
Since the MicroSquirt does not have an
onboard MAP sensor, we have added a MAP sensor in the upper left
hand corner. The kit ships with a 2.5 bar sensor, which can be
upgraded to our MapDaddy 4 bar sensor with barometric correction
for high boost engines and real time altitude correction.
Below the MAP sensor, there are two relay
control outputs. These can be used for fan control, variable
intake solenoids, nitrous output, or other low current draw,
on/off applications.
They can also be jumpered to work with ground triggered
ignition modules.
The boost control transistor provides PWM control for boost
control solenoids.
There are three connectors at the top of
the DIYPNP board. The DB9 allows you to connect a regular serial
cable to plug the DIYPNP into your laptop; the "BL/TH" jumper
allows you to send 5 volts to pin 9 to power Bluetooth or
wireless RS232 adapters.
The DB15 connector is for adding additional circuits not
included in a factory wiring harness. Note that the top row of
pins has somewhat thicker traces; if you are going to be running
spark control or boost control out the DB15, we recommend using
the upper row of pins.
Lastly, we've provided a 12 volt jack that allows you to
power the DIYPNP without plugging it into your wiring harness.
This can be useful for both diagnostics and loading firmware to
the unit.
You can add up to four BIP373 transistors for
direct coil control. Each can drive a single coil, allowing for
wasted spark on a V8 or coil per plug ignition on a four
cylinder. Each BIP373 is provided with its own heat sink,
removing the need for mica insulators. There is a jumper to
allow using the standard MicroSquirt ignition input or to allow
you to switch to a different input circuit if needed. The output
connections are numbered S1 through S4. One BIP373 is included
as standard equipment on the Bosch 55 pin version; on other
DIYPNP models, these are sold separately.
We've put a separate 5 volt power supply on
the DIYPNP main board that can be used to power 5 volt circuits.
Noise in this power circuit will not affect the processor or
cause resets. It can supply up to 500 mA of current. It's
use is purely optional in the event you're adding additional
functionality and either need the additional power capacity or
need a 'dirty' power source, separate from the 5v source used by
the processor which must be kept clean.
There are five spots for pull-up resistors
in the lower right hand corner of the board. They allow you to
apply a 5 or 12 volt pull up to several inputs and outputs, in
order to accommodate different ignition control and output
setups.
The circuits marked Input 1 and Input 2 are
general purpose on/off inputs, with a buffer circuit to protect
the processor. They are designed for ground triggered inputs,
but with some protection for the processor if you accidentally
connect them to 12 volts. The output is 5 volts when the input
wire is disconnected, 0 volts when the input signal is pulled to
ground. These can be used for launch control or table switching.
We have put a basic knock control circuit
in the center of the board. This is an untuned knock input
circuit that normally puts out a 5 volt signal. When it detects
knock, it pulls the signal to 0 volts for 0.4 seconds. The trim
pot allows you to tune its sensitivity.
The board has several sets of headers, most
of which are clustered around the lower edge or near the proto
area at the top of the board. Generally, the ones at the lower
edge are intended for jumpers to the adapter board, while the
ones in the center are for connections to the circuits inside
the board. Here are the headers and what their pins do.
Edge connections:
-
IAT - Intake air temperature sensor
input
-
CLT - Coolant temperature sensor input
-
TPS SIG - Throttle position sensor
signal
-
O2 SENSOR - Oxygen sensor input
-
VR IN - and VR IN + - Input for a
variable reluctor crankshaft position sensor
-
OPTO IN - and OPTO IN + - Input for a
Hall effect or optical crankshaft position sensor
-
VR2 IN + - Input for a camshaft
position sensor.
-
IAC - Output for a 2 wire idle air
control valve.
-
TACH OUT - 12 volt tach drive output.
-
FUEL PUMP - Signal to drive a fuel pump
relay.
-
INJ 1 and INJ 2 - Each of these headers
has four connections and can drive four low impedance
injectors.
-
12V - Use these connections to supply
12 volt power to the board.
-
VREF - 5 volt reference voltage for
sensors.
-
5V - 5 volt power voltage from the main
board voltage regulator.
-
SG - Signal ground, for sensor returns.
-
GND - Power ground.
-
IGN1 and IGN2 - Logic level ignition
outputs.
-
WLED - Warm up LED output, which can be
used as the 3rd spark output or as a relay
control.
-
ALED - Acceleration LED, which can be
used as the 4th spark output or as a relay
control.
-
OPTO GND - Connecting this jumper
connects the negative optical input terminal to ground.
18 pin center header:
-
IG1 - Logic level spark output 1.
-
IG2 - Logic level spark output 2.
-
WLD - Warm up LED output, which can be used
as the 3rd spark output or as a relay control.
-
ALD - Acceleration LED, which can be used
as the 4th spark output or as a relay control.
-
PT6 - General purpose output port,
equivalent to IAC1 on a MS2. Can be used for general purpose
outputs, boost control, or nitrous output stage 1.
-
PT7 - General purpose output port,
equivalent to IAC2 on a MS2. Can be used for general purpose
outputs, boost control, or nitrous output stage 2.
-
PIB4 - On a full sized MS2, used to control
a stepper chip. Useful if you are building a stepper IAC circuit
in the proto area.
-
ALTCAM - Use for adjusting the VR2 circuit
sensitivity. Pulling this voltage up or down changes the trigger
threshold.
-
MAP - Manifold absolute pressure input,
used if not using the onboard MAP sensor.
-
ADC1 - Analog to digital input 1,
equivalent to JS4 on a full sized MS2. The knock input circuit
connects to this one, or can be used for a second O2 sensor,
launch control, or nitrous input.
-
ADC2 - Analog to digital input 2,
equivalent to JS5 on a full sized MS2. The baro correction pin
near the MAP sensor connects here. Other uses include a second
O2 input, launch contro1, or nitrous input.
-
FLEX - Flex fuel input. Connects to PE0 on
the processor, and can be used for flex fuel sensors or launch
control.
-
PA0 - Equivalent to JS11 on a MS2. Can be
used for launch control input, a general purpose output, or
boost control.
-
CANH and CANL - Connections for CANBUS
output.
-
LOGIC LEVEL INJ - We've brought the
injector driver signals out as 5 volt logic level signals for
peak and hold devices or other alternate injection drivers.
10 pin center header (handy for plug-in upgrade modules that
may spring up):
Potential uses for this header are for an IAC
Stepper Board, or a 4-cyl Sequential Fuel Injection Upgrade
Module
-
12V - 12v Power Supply for upgrade
modules using this header.
-
VREF - 5 volt reference voltage for
sensors.
-
5V - 5 volt power voltage from the main
board voltage regulator.
-
GND - Power ground.
-
IAC - Output for a 2 wire idle air control
valve.
-
PT6 - General purpose output port,
equivalent to IAC1 on a MS2. Can be used for general purpose
outputs, boost control, or nitrous output stage 1.
-
PT7 - General purpose output port,
equivalent to IAC2 on a MS2. Can be used for general purpose
outputs, boost control, or nitrous output stage 2.
-
PIB4 - On a full sized MS2, used to control
a stepper chip. Useful if you are building a stepper IAC circuit
in the proto area.
-
SG - Signal ground, for sensor returns.
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