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Wiring Diagrams

• Link 4.7K Resistor between VIN & D10 pins.
• Attach +12v source to VIN pin & Flex fuel Sensor.
• Attach ground to GND Pin & Fled fuel Sensor.
• Attach Flex Fuel vOut (signal wire) to D10 pin.

• Link 4.7K Resistor between VIN & D10 pins.
• Attach +12v source to VIN pin & Flex fuel Sensor.
• Attach ground to GND Pin & Fled fuel Sensor.
• Attach Flex Fuel vOut (signal wire) to D10 pin.
• Attach OLED GND pin to Arduino GND pin.
• Attach OLED VCC pin to Arduino +5V pin.
• Attach OLED SCL pin to Arduino A5 pin.
• Attach OLED SDA pin to Arduino A4 pin.

Additional Inputs/Outputs

DAC Add On

Unity Gain Buffer / Voltage Follower

About the code

If you choose to flash your own custom code through Arduino IDE, or create.arduino.cc, at the top of the main program code you’ll see a bunch of flags, change them as you see fit. For example if you intend to use the unit with a DAC chipset connected to Cobb AP3 using a 0.5-4.5v range, you should make sure the first and third flags are set to 1.

Note: If you enable featureAnalogInA1 without anything attached to the A1 input pin, the bottom triangle gauge/bar graph will be bouncy and could be annoying. If you want to keep it enabled for future use, to prevent the bouncy, temporarily tie the A1 pin to ground.

Another note: If you enable featureDAC without the MCP4725 chipset, it doesn’t have any adverse effects; same with enabling featurePWMout without anything attached.

///////// Features can be enabled or disabled below ///////
int featureDAC = 1; //DAC analog output (MCP4725 required) default=1 (enabled)
int featurePWMout = 1; //PWM Analog output (pin D9) default=1 (enabled)
int voltOUTRange = 0; //PWM&DAC Output Range (0=0-5v , 1=0.5-4.5v) default=0 (0-5v) Setting to 1 will output 0.5v-4.5v and also enable Cobb error conditions
int featureAnalogInA1 = 0; //0-5v Analog Input(Pin A1) for bar graph default=0 (disabled) (setting this to zero essentially