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NO2C for Speeduino

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The No Overhang Two Channel boards made for Speeduino share the features below

  • Arduino MEGA 2560 shield board
  • Same size as the Arduino
  • 2 injector output channels
  • 2 coil output channels
  • Dedicated tachometer output
  • 4 medium/high current outputs (idle, boost, VVT, fuel pump, fan, etc)
  • IAT, CLT, TPS, and O2 inputs (protected)
  • On-board MAP sensor
  • Stepper idle control through board mounted DRV8825 accessory PCB
  • VR conditioning through board mounted VR conditioner accessory PCB

Like the official Speeduino boards, the NO2C requires igniter driven coils and a conditioner for crank/cam signals that aren't 5v square-wave. The board is designed to accept the official Speeduino conditioner board for signals that do not meet the requirements.

NO2C v0.1.x

Uses the AMP MTA-100 or Molex KK100/KK254 connector system and through hole components

v0.1.0

  • Had flaws which caused the Arduino USB connector to interfere with the boards solder pads
  • lacked tachometer output
  • was never released

v0.1.1

  • corrected the issue mentioned above
  • added tachometer output

NO2C v0.2.x

Uses the Molex Micro-Fit 3.0 connector system and through hole components. The Micro-Fit connector is used as a computer power connector and there are several manufacturers, it's known generically as 3mm connector.

For some tips that will help make the assembly of your board a success: v0.2.x Assembly Tips

v0.2.0

  • Added pass through pinholes around the edge for daughter board expansion
  • Increased size of resistor footprints making it easier to find usable resistors and/or use precision resistors for all voltage dividers
  • Increased pitch of 1uf caps (see above)
  • Added launch control input

v0.2.1

  • Improved silk screen
  • All MOSFET outputs (injector and auxiliary) have the same gate connection to the Arduino MEGA
  • VR signals are routed straight into the conditioner
  • MAP sensor location accepts either though-hole or SMD part
  • Other routing and placement adjustments (R10 and R11 are flipped)

v0.2.2

  • Moved C20 from the edge of the board, it has always bothered me there
  • Added Serial0/Bluetooth header
  • Other routing and placement adjustments

vC1

  • Traditional reset protection removed in favor of a jumper and resistor to hold the reset pin high
  • Routing and placement adjustments
  • Version style changed to bring inline with other projects and due to required BOM change compared to v0.2.x

NO2C DB

A daughter board that stacks on top of the NO2C v0.2.x and vCx boards to add the features below. The daughter boards are hybrid surface mount/through hole, see features below for which parts are through hole.

DB1 (Scraped)

Makes it easy to add additional general outputs, and can be populated to add all the features below.

  • 4 low current outputs (through hole)
  • 2 general digital inputs (protected)
  • 1 analog input (protected)
  • Flex-fuel input (protected)
  • Barometric pressure sensor (provides constant correction vs power on base)

DB2

Makes it easy to add additional coil outputs, and can be populated to add all the features below.

  • 2 additional coil output channels (through hole)
  • 4 low current outputs
  • 2 general digital inputs (protected)
  • 1 analog input (protected)
  • Flex-fuel input (protected)
  • Barometric pressure sensor (provides constant correction vs power on base)

With the low current outputs you could reconfigure two of the medium/high current outputs on the NO2C to act as injector drivers. To do this you will have to make minor changes to the firmware before programming the Arduino.