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Difference between revisions of "RaceCapturePro Sensors"

(Set up the Analog Channel)
 
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|
 
|
 
[[Image:SU109_C.jpg|150px]]
 
[[Image:SU109_C.jpg|150px]]
[[Image:add_to_cart.png|link=http://www.autosportlabs.com/product/gm-coolant-temperature-sensor/]]
 
|[[Image:5615pt.png|150px]]
 
[[Image:add_to_cart.png|link=http://www.autosportlabs.com/product/gm_coolant_temperature_sensor_pigtail/]]
 
 
| 3/8" NPT threaded brass body and a 2 pin terminal.
 
| 3/8" NPT threaded brass body and a 2 pin terminal.
 
| Can be used for air inlet temperature for normally aspirated engine
 
| Can be used for air inlet temperature for normally aspirated engine
  
| rowspan="2" | * Using [[#Temperature_Sensor|2.2K pullup resistor]]
+
| rowspan="3" |
[[Image:GM_sensor_analog_calibration.png|thumb|400px|left]]
+
* Using [[#Temperature_Sensor|2.2K pullup resistor]]
{|class="wikitable"
+
| rowspan="3" |
! Volts
+
* Preset available in the RaceCapture app
! Scaled Value (Degrees F)
+
|-
+
|0.37
+
|212.00
+
|-
+
|0.51
+
|178.00
+
|-
+
|1.99
+
|104.0
+
|-
+
|2.47
+
|72.0
+
|-
+
|4.24
+
|23.0
+
|}
+
 
+
 
+
 
|-
 
|-
 
|
 
|
Line 55: Line 33:
 
|
 
|
 
[[Image:SU107_C.jpg|150px]]
 
[[Image:SU107_C.jpg|150px]]
[[Image:add_to_cart.png|link=http://www.autosportlabs.com/product/gm-air-temperature-sensor/]]
 
|[[Image:5616pt.png|150px]]
 
[[Image:add_to_cart.png|link=http://www.autosportlabs.com/product/gm-air-temperature-sensor-pigtail/]]
 
  
 
| 3/8" NPT threaded brass body and a 2 pin terminal.
 
| 3/8" NPT threaded brass body and a 2 pin terminal.
Line 65: Line 40:
 
* Due to the fragility of the sensing bulb, it is necessary to pot the base of the sensor leads with sensor-safe silicone when used in high vibration environments.
 
* Due to the fragility of the sensing bulb, it is necessary to pot the base of the sensor leads with sensor-safe silicone when used in high vibration environments.
 
|-
 
|-
| colspan="6" align="center" style="background-color:#FFC863;" | <h2>AEM</h2>
+
| colspan="6" align="center" style="background-color:#FFC863;" | <h2>Delphi Style</h2>
 
|-
 
|-
 
|
 
|
Line 82: Line 57:
 
|
 
|
 
* Using [[#Temperature_Sensor|2.2K pullup resistor]]
 
* Using [[#Temperature_Sensor|2.2K pullup resistor]]
[[Image:AEM-30-2012_analog_calibration.png|thumb|400px|left]]
+
* Preset available in the RaceCapture app
{|class="wikitable"
+
! Volts
+
! Scaled Value (Degrees F)
+
|-
+
|0.40
+
|302.00
+
|-
+
|0.87
+
|239.00
+
|-
+
|1.88
+
|176.0
+
|-
+
|3.2
+
|122.0
+
|-
+
|4.72
+
|32.0
+
|}
+
 
|-
 
|-
 
| colspan="6" align="center" style="background-color:#FFC863;"  | <h2>Infrared Sensors</h2>  
 
| colspan="6" align="center" style="background-color:#FFC863;"  | <h2>Infrared Sensors</h2>  
Line 137: Line 93:
 
* [http://www.aemelectronics.com/Images/Products/Installation%20Instructions%2030-2131-XXX%20Pressure%20Sensors.pdf Technical Specifications]
 
* [http://www.aemelectronics.com/Images/Products/Installation%20Instructions%2030-2131-XXX%20Pressure%20Sensors.pdf Technical Specifications]
 
* Default kit from AEM includes pigtail
 
* Default kit from AEM includes pigtail
| rowspan="2" |
+
| rowspan="3" |
* Since these type of sensors have a linear output, replace the 4.5v value with the max pressure of the device in the units you prefer. e.g. 10 bar, 150 psi, etc.
+
* Preset available in the RaceCapture app
* Repeat the value through the rest of the calibration table.
+
 
+
 
+
[[Image:150psi_sensor_analog_calibration.png|thumb|400px|left]]
+
 
+
{|class="wikitable"
+
! Volts
+
! Scaled Value (PSI)
+
 
|-
 
|-
|0.5
+
| Various
|0.0
+
| [[Image:10_bar_150_psi_ss_pressure_sensor.jpg|100px]]
|-
+
[[Image:add_to_cart.png|link=https://www.autosportlabs.com/product/10-bar-145-psi-fluid-pressure-sensor/]]
|4.5
+
| 3 pin GM connector
|150.0
+
| 1/8" NPT port
|-
+
|
|4.5
+
* 150 PSI stainless steel pressure sensor.
|150.0
+
* Linear response with an output between 0.5v and 4.5v
|-
+
* Other sensor ranges are possible - e.g. 10, 30, 150 bar, with a consistent linear output.
|4.5
+
|150.0
+
|-
+
|4.5
+
|150.0
+
|}
+
 
+
  
 
|-
 
|-
| Various
+
| 2175 PSI / 150 Bar sensor
 
| [[Image:10_bar_150_psi_ss_pressure_sensor.jpg|100px]]
 
| [[Image:10_bar_150_psi_ss_pressure_sensor.jpg|100px]]
 +
[[Image:add_to_cart.png|link=https://www.autosportlabs.com/product/100-bar-1450-psi-pressure-sensor/]]
 
| 3 pin GM connector
 
| 3 pin GM connector
 
| 1/8" NPT port
 
| 1/8" NPT port
 
|
 
|
* 10 bar (145 PSI) stainless steel pressure sensor.
+
* 2175 PSI / 150 Bar stainless steel pressure sensor.
 
* Linear response with an output between 0.5v and 4.5v  
 
* Linear response with an output between 0.5v and 4.5v  
* Other sensor ranges are possible - e.g. 10, 30, 150 bar, with a consistent linear output.
+
* Typically used for high pressure sensing, such as brake or clutch pressure
 +
 
 
|-
 
|-
 
| colspan="6" align="center" style="background-color:#FFC863;" | <h2>Manifold Pressure (MAP) Sensors</h2>
 
| colspan="6" align="center" style="background-color:#FFC863;" | <h2>Manifold Pressure (MAP) Sensors</h2>
Line 189: Line 132:
 
|3 bar MAP sensor
 
|3 bar MAP sensor
 
|
 
|
[[Image:GM_3_bar_map_sensor_analog_calibration.png|left|400px|thumb]]
+
* Preset available in the RaceCapture app
{|class="wikitable"
+
! align="left"| Volts
+
! Manifold Pressure (KPa)
+
|-
+
|0
+
|3.6
+
|-
+
|1.25
+
|80.0
+
|-
+
|2.5
+
|159
+
|-
+
|3.75
+
|237
+
|-
+
|5.0
+
|315.0
+
|}
+
 
|-
 
|-
 
| Freescale MXP4250AP
 
| Freescale MXP4250AP
Line 219: Line 143:
 
* An extremely popular MAP sensor used in the Megajolt ignition and Megasquirt fuel injection systems.  
 
* An extremely popular MAP sensor used in the Megajolt ignition and Megasquirt fuel injection systems.  
 
* Can be used in a simple circuit and powered by the 5v voltage reference from Race Capture
 
* Can be used in a simple circuit and powered by the 5v voltage reference from Race Capture
|
+
| * Preset available in the RaceCapture app
 
|-
 
|-
 
| colspan="6" align="center' style="background-color:#FFC863;"  | <h2>Tire Pressure</h2>
 
| colspan="6" align="center' style="background-color:#FFC863;"  | <h2>Tire Pressure</h2>
Line 391: Line 315:
 
LSU 4.9 sensor
 
LSU 4.9 sensor
 
|
 
|
calibration
+
* Preset available in the RaceCapture app
[[file:texense_wideband.png|400px]]
+
 
+
{|class="wikitable"
+
! align="left"| Volts
+
! Scaled (AFR)
+
|-
+
|0.004
+
|8.4
+
|-
+
|1.36
+
|11.3
+
|-
+
|2.3
+
|14.0
+
|-
+
|2.879
+
|18.4
+
|-
+
|3.395
+
|26.7
+
|}
+
 
+
 
+
 
+
 
|}
 
|}
  
Line 423: Line 323:
 
* RaceCapture/Pro has 8 analog inputs; the 8th input is wired internally to measuring battery voltage.
 
* RaceCapture/Pro has 8 analog inputs; the 8th input is wired internally to measuring battery voltage.
 
* Analog input range is 0 - 5v
 
* Analog input range is 0 - 5v
* Input Impedance: 15K ohm
+
* Input Impedance: over 1 meg ohm
  
 +
==Calibrating an Analog Sensor==
 +
Refer to your sensor's data sheet for the sensor's calibration curve.
 +
 +
===Linear Sensors===
 +
A linear sensor may specify two voltages/value pairs representing a low and high range for the sensor.  A straight line is drawn between the points on the sensor.
 +
====Example: 150 PSI pressure sensor====
 +
* 0.5 v = 0 PSI
 +
* 4.5 v = 150 PSI
 +
 +
In the Analog Channel configuration, select the "'Mapped"' sensor mode, and then enter the values into the interpolated mapping grid.
 +
* For column 1, enter the low voltage range in the '''Volts''' cell, and the low scaled value in the '''Scaled''' cell.
 +
* For columns 2-5 enter the high voltage range in the '''Volts''' cell, and the high scaled value in the '''Scaled''' cell
 +
[[file:linear_sensor_mapping.png]]
 +
 +
===Curved Sensors===
 +
These are often seen with thermistor based temperature sensors, where the response is not a straight line, but a curve.  Multiple points can be used to sufficiently approximate the curve.
 +
* '''Note''': RaceCapture will linearly interpolate the scaled values between the sensor points, so value transitions will be smooth.
 +
 +
====Example: Extended Range temperature sensor with 5v reference and 2.2K pullup resistor====
 +
* 0.4 v = 302 F
 +
* 0.87 v = 239 F
 +
* 1.88 v = 176 F
 +
* 3.2 v = 122 F
 +
* 4.72 v = 32 F
 +
 +
In the Analog Channel configuration, select the '''Mapped''' sensor mode, and then enter the values into the interpolated mapping grid.
 +
* '''Note''': If you have more than 5 points for the curve, spread the selection of points evenly between your low and high range. 
 +
 +
[[file:curved_sensor_mapping.png]]
 +
 +
=Types of Sensors=
 
==Temperature Sensor==
 
==Temperature Sensor==
 
Temperature sensors are passive devices that measure temperature through the use of a thermistor, a resistor that varies resistance with temperature.
 
Temperature sensors are passive devices that measure temperature through the use of a thermistor, a resistor that varies resistance with temperature.
Line 509: Line 440:
 
=====If you already have a gauge connected=====
 
=====If you already have a gauge connected=====
 
You will '''not need''' a pullup resistor - the gauge's internal circuitry already provides one. You will only need to tap into the existing signal feeding the fuel gauge sender.  Jump to the calibration process below.
 
You will '''not need''' a pullup resistor - the gauge's internal circuitry already provides one. You will only need to tap into the existing signal feeding the fuel gauge sender.  Jump to the calibration process below.
 +
 +
* '''Note''' you will need to ensure the sender does not exceed 5v during calibration. if it does, you will need an additional voltage divider to scale the voltage down to 0-5v required by the RaceCapture input.
  
 
[[file:Fuel_level_sender_with_existing_gauge.png]]
 
[[file:Fuel_level_sender_with_existing_gauge.png]]

Latest revision as of 04:00, 5 April 2019

Sensors

Temperature Sensors

GM-Style

Mfg / Part # Image Pigtail Mechanical Notes Analog Channel Configuration
  • Wells SU109
  • SMP TX3
  • Pigtail: Pico 5615pt

SU109 C.jpg

3/8" NPT threaded brass body and a 2 pin terminal. Can be used for air inlet temperature for normally aspirated engine
  • Preset available in the RaceCapture app
  • Wells SU107
  • SMP AX1
  • Pigtail: Pico 5616pt

SU107 C.jpg

3/8" NPT threaded brass body and a 2 pin terminal.
  • Use for measuring air inlet temperature.
  • Exposed sensing element, necessary for boosted engines where fast response times are necessary.
  • Due to the fragility of the sensing bulb, it is necessary to pot the base of the sensor leads with sensor-safe silicone when used in high vibration environments.

Delphi Style

  • Delphi 12160855 equivalent
  • AEM-30-2012 Equivalent
AEM-30-2012.jpg

Add to cart.png

  • Extended temperature range - suitable for coolant and oil
  • 1/8" NPT
  • Plug set and pins are included with kit

Infrared Sensors

Mfg / Part # Image Notes

Thermocouple Sensors

Mfg / Part # Image Notes

Pressure Sensors

Fluid Pressure

These sensors are appropriate for measuring fluid pressures in an engine. Not appropriate for measuring manifold boost or vacuum as these are relative pressure sensors. Use an absolute pressure sensor instead.
Mfg / Part # Image Pigtail Mechanical Notes Analog Channel Configuration
AEM 30-2131-150 AEM-30-2131-150.jpg 3 pin GM connector 1/8" NPT
  • 150 PSI pressure sensor, appropriate for oil and fuel.
  • Linear response with an output between 0.5v and 4.5v
  • Technical Specifications
  • Default kit from AEM includes pigtail
  • Preset available in the RaceCapture app
Various 10 bar 150 psi ss pressure sensor.jpg

Add to cart.png

3 pin GM connector 1/8" NPT port
  • 150 PSI stainless steel pressure sensor.
  • Linear response with an output between 0.5v and 4.5v
  • Other sensor ranges are possible - e.g. 10, 30, 150 bar, with a consistent linear output.
2175 PSI / 150 Bar sensor 10 bar 150 psi ss pressure sensor.jpg

Add to cart.png

3 pin GM connector 1/8" NPT port
  • 2175 PSI / 150 Bar stainless steel pressure sensor.
  • Linear response with an output between 0.5v and 4.5v
  • Typically used for high pressure sensing, such as brake or clutch pressure

Manifold Pressure (MAP) Sensors

  • Sensor: 12223861 (GM)
  • Pigtail: 15305891 (GM) PT1035 (AC Delco)

GM 3bar map sensor.jpg Add to cart.png

GM 15305891 pigtail.jpg
  • Bracket for firewall mounting
  • vacuum port
3 bar MAP sensor
  • Preset available in the RaceCapture app
Freescale MXP4250AP

Freescale-Semiconductor-MPX4250AP.jpg Add to cart.png

2.5 bar MAP sensor
  • An extremely popular MAP sensor used in the Megajolt ignition and Megasquirt fuel injection systems.
  • Can be used in a simple circuit and powered by the 5v voltage reference from Race Capture
* Preset available in the RaceCapture app

Tire Pressure

Mfg / Part # Image Notes
Schrader
  • OEM TMPS System
  • Schrader TPMS receiver outputs tire pressure data on the CAN bus. would need to reverse engineer CAN bus protocol.
  • Analysis / Reverse engineering work queued

Pulse/Speed/RPM Sensors

RPM

Mfg / Part # Image Notes
Autosport Labs CoilX CoilX.png The CoilX sensor module is designed to safely interface the noisy, high voltage RPM signal at the ignition coil pack primary into a clean signal that RaceCapture/Pro can process.

Wheel Speed / Gear speed

Hall effect speed sensors will require an external 1K pull-up resistor, connected to 5v. This can be wired up near the sensor connection for convenience.
Mfg / Part # Image Notes Pulse Channel Configuration
Hamlin 55505

Hamlin 55505 gear wheel speed sensor.jpg Add to cart.png

  • Simple 3 wire hookup - No external pullup resistor required
  • Rugged Hall effect sensor suitable for harsh automotive environments (fuels, solvents, lubricants)
  • -40 to 125c operation
  • Technical Specifications
  • Configure the pulse channel with the number of pulses per revolution, which maps to the number of teeth on the gear / wheel.
Cherry GS100701

Cherry GS100701 gear speed sensor.jpg Add to cart.png

Distance Sensors

Ride Height

Mfg / Part # Image Pigtail Notes Analog Channel Configuration
Sharp GP2D12 Sensor GP2D12.jpg
  • Optical distance sensor - 10 to 80cm range
  • 3-pin connector, analog output
  • Possible uses include ride height position (pointed at ground) and pedal position
  • Technical Specifications

Steps to calibrate:

  1. After installation place the vehicle on a level surface.
  2. Set the Analog calibration to 0-5v simple linear scaling
  3. At rest, note the voltage of the sensor. This is the zero level.
  4. Raise and safely support the corner of the vehicle and remove the spring.
  5. Move the suspension arm to full droop. Note actual inches / mm traveled and also note the voltage logged by RaceCapture/Pro
  6. Move the suspension arm to full compression. Note actual inches / mm and also note the voltage logged by RaceCapture/Pro
  7. Create Calibration Table:
  • Place the droop voltage / distance combination into the 1st column of the calibration table. Make the distance negative
  • Place the 'at rest' voltage into the 2nd column of the calibration table. Make the distance zero
  • Place the compression voltage / distance into the 3rd column of the calibration table. Make the distance positive
  • Repeat the compression voltage / distance values for the 4th and 5th columns.
  • BMW 37140141444
  • Pigtail: 61138383300
BMW 37140141444 ride height sensor.jpg BMW 61138383300.jpg
  • 5v power supply
  • Approximately 0-5v output
  • Measures distance over 90 degrees of the arm travel.
  • Used as a ride-height sensor for BMW and Mini applications for auto-leveling headlights
Texense RHS Texense RHS Infrared Ride Height Sensor.jpg
KA Sensors RHL3 KA Sensors RHL3 Laser Ride Height Sensor.jpg
Various Mfg / String Potentiometer String Potentiometer.jpg

String Potentiometers can be used for a variety of purposes: Linear, distance, and rotation (if cable is wrapped around a shaft)

Angle / Rotation Sensors

Throttle Position (TPS)

Mfg / Part # Image Pigtail Mechanical Notes Analog Channel Configuration
Ford / SMP TH45

TPS-45.jpg Add to cart.png

5752pt.jpg Add to cart.png

Screw mounted, keyed input for throttle shaft

Common Ford style Throttle Position sensor

To calibrate, note the voltage at 0% throttle and then at 100% throttle. Use these two numbers to create a 2 point analog scaling map.


Air / Fuel Ratio Sensors

Mfg / Part # Image Pigtail Mechanical Notes Analog Channel Configuration
Texense LSU 4.9 Sensor

Texense lsu49-5v-analog-controller 54 1z-500x480.jpg Add to cart.png

Built-in wiring Screws into O2 sensor port

LSU 4.9 sensor

  • Preset available in the RaceCapture app

Wiring Analog Sensors

RaceCapture/Pro Analog Input Specifications

  • RaceCapture/Pro has 8 analog inputs; the 8th input is wired internally to measuring battery voltage.
  • Analog input range is 0 - 5v
  • Input Impedance: over 1 meg ohm

Calibrating an Analog Sensor

Refer to your sensor's data sheet for the sensor's calibration curve.

Linear Sensors

A linear sensor may specify two voltages/value pairs representing a low and high range for the sensor. A straight line is drawn between the points on the sensor.

Example: 150 PSI pressure sensor

  • 0.5 v = 0 PSI
  • 4.5 v = 150 PSI

In the Analog Channel configuration, select the "'Mapped"' sensor mode, and then enter the values into the interpolated mapping grid.

  • For column 1, enter the low voltage range in the Volts cell, and the low scaled value in the Scaled cell.
  • For columns 2-5 enter the high voltage range in the Volts cell, and the high scaled value in the Scaled cell

Linear sensor mapping.png

Curved Sensors

These are often seen with thermistor based temperature sensors, where the response is not a straight line, but a curve. Multiple points can be used to sufficiently approximate the curve.

  • Note: RaceCapture will linearly interpolate the scaled values between the sensor points, so value transitions will be smooth.

Example: Extended Range temperature sensor with 5v reference and 2.2K pullup resistor

  • 0.4 v = 302 F
  • 0.87 v = 239 F
  • 1.88 v = 176 F
  • 3.2 v = 122 F
  • 4.72 v = 32 F

In the Analog Channel configuration, select the Mapped sensor mode, and then enter the values into the interpolated mapping grid.

  • Note: If you have more than 5 points for the curve, spread the selection of points evenly between your low and high range.

Curved sensor mapping.png

Types of Sensors

Temperature Sensor

Temperature sensors are passive devices that measure temperature through the use of a thermistor, a resistor that varies resistance with temperature.

We recommend using dedicated, two wire ECU-style sensor similar to the types specified in our recommended sensor list for best results.

Temp sensor connection.png

Pullup resistor

A pullup resistor is needed to create the necessary voltage divider circuit so RaceCapture/Pro's analog input can measure temperature as a varying voltage. This pullup resistor is connected to the 5v reference on the RaceCapture/Pro terminal block.

High Resistance ECU style sensors

Use a 2.2K ohm pull-up resistor for high resistance ECU style sensors, such as the temperature sensors in the supported list

Low Resistance Gauge type sensors

Low resistance gauge type sensors are not recommended. If you must use one of these types of sensors, a 1/4 watt 220 ohm pull-up resistor can be used for sensors such as VDO 323-095, 325-002 and similar.

Sensor Ground

Two wire ECU style temperature sensors have one sense lead and one ground lead. For best accuracy, connect the ground lead to the same ground point as RaceCapture/Pro.

One wire gauge type sensors have the ground as the body of the sensor. Ensure the engine is properly grounded to the chassis via multiple ground straps.

Active Sensors

Active sensors are powered devices that provide a variable voltage output related to the environment being measured- such as pressure, distance, temperature, speed, force, etc.

Active sensor connection.png

Active sensors are particularly easy to wire. Nearly all active sensors for automotive applications specify 5v power and produce an output within 0 to 5v, making them directly compatible with RaceCapture/Pro. Most active sensors have a linear output and therefore are very easy to calibrate.

Steps for connecting an active sensor

  1. Identify the power, ground and output signal wires. The sensor technical documentation will provide this information.
  2. Connect the sensor ground to the same location as the ground point for RaceCapture/Pro
  3. If the sensor is 5v powered, connect it to the 5v voltage reference on RaceCapture/Pro
  4. Connect the sensor output signal to the desired analog input port of RaceCapture/Pro

Wheel Speed / Hall Effect Sensor

Wheel speed sensors generate a series of pulses as a toothed wheel passes by the face of the sensor. We recommend hall-effect style sensors, and these are provided with 3 connections:

  • Power
  • Ground
  • Signal Output

Note: - We do not recommend using 2 wire Variable Reluctance (VR) type sensors. VR Sensors will require a conditioning circuit before being provided to the inputs of RaceCapture/Pro.

Speed sensor connection.png

Wiring the Speed Sensor

  • Power: Connect the sensor's power to the 5v Vref on RaceCapture/Pro
  • Ground: Connect the sensor's ground connection to the ground shared by RaceCapture/Pro
  • Sensor Output: Connect the Sensor Output to one of RaceCapture/Pro's timer input channels

Optional pull up resistor

RaceCapture/Pro requires both a voltage and ground pulse provided in the waveform provided by the sensor. Most sensors provide an internal pull-up resistor so an active square wave can be observed on the output. However, some sensors only switch ground and leave the output line in a high impedance state when not active, like opening and closing a mechanical switch. If the sensor does not provide a pull-up resistor the wheel speed signal may have noise and glitches which may be observed as high value glitches in the dashboard and log file data.

If it's determined a pull-up resistor is needed:

  • Use 2.2 to 10K pull-up resistor can be added close to RaceCapture/Pro to ensure a clear signal
  • You can use the SensorX breakout board to conveniently wire this pull-up resistor

Throttle Position / Variable Resistors (Potentiometers) / Linear sensors

These type of sensors are passive devices comprising some form of a variable resistor. Examples include:

  • Throttle Position Sensors
  • Linear sensors
  • String Potentiometers
  • Single and multi-turn Potentiometers
  • Fuel Level Sensors

Standard Variable Resistor (Potentiometer)

These are typically found in Throttle Position Sensors (TPS), string potentiometers, and linear sensors.

Potentiometer Sensor Connection.png

  1. Consult the sensor's technical documentation for sensor connections.
  2. Connect one of the outside legs of the variable resistor to the ground point for RaceCapture/Pro
  3. Connect the opposite leg of the variable resistor to the 5v Vref of RaceCapture/Pro
  4. Connect the variable resistor wiper (typically the center lead) to the the desired analog input port of RaceCapture/Pro

During calibration, if the sensor reads backwards, flip the 5v and ground connections.

Fuel Level Sensors

Also a variable resistor, these provide a variable resistance based on the level of the float.

Wiring

Determine if you need a pullup resistor, or if you are tapping into an existing circuit with a gauge.

If you already have a gauge connected

You will not need a pullup resistor - the gauge's internal circuitry already provides one. You will only need to tap into the existing signal feeding the fuel gauge sender. Jump to the calibration process below.

  • Note you will need to ensure the sender does not exceed 5v during calibration. if it does, you will need an additional voltage divider to scale the voltage down to 0-5v required by the RaceCapture input.

Fuel level sender with existing gauge.png

If you have no gauge / you want to only use RaceCapture for your dashboard gauge

If you only have the sender and want to directly integrate with RaceCapture's analog input, follow this procedure.

Fuel level sender direct connection.png

  • Choose a pull-up resistor value based on the the sender's ohm range. If it is less than 1000 ohms, then choose a 1000 (1K) ohm resistor as your pull-up. If the sender range is higher than 1000 ohms, choose a 2.2K resistor.
    • Rule of thumb - choose a resistor that is about 2X to 4X the maximum resistance of the sender.
    • A 1/2 watt, 1% accuracy resistor is recommended.
  • Wire up the sender per the diagram:
    • Connect the ground of the fuel level sender to ground (ideally the same ground point used by RaceCapture)
    • Connect the output of the sender to one of RaceCapture's analog inputs
    • Connect the pullup resistor between +5v reference and the sender's output. This creates the voltage divider circuit which will present RaceCapture with a variable voltage depending on fuel level.

Calibration

With the fuel at different levels, measure and note the voltage present at the RaceCapture analog input for different fuel levels:

  • Empty (0%)
  • 1/4 (25%)
  • 1/2 (50%)
  • 3/4 (75%)
  • Full (100%)

Set up the Analog Channel

  • Choose an available analog input for your Fuel Level channel, then select the basic fuel level preset by selecting FuelLevel in the dropdown list.
    • This pre-sets the units (%), logging precision and min / max values. You can edit this by pressing the gear button next to the channel name.
  • Set the sample rate to 1Hz.
  • Set the mode to Mapped. This will let you create a curved mapping for the sensor voltage.
  • Set the smoothing to Maximum - this will help account for variances due to fuel slosh.
  • Enter the mapped values noted in the calibration process into the Analog Channel mapping editor under RaceCapture setup. This will provide the calibration curve for your fuel tank.
  • Write these settings back to RaceCapture and observe your fuel level readings in units of percentage.

Example BMW E36 fuel level mapping

Example BMW E36 Fuel curve mapping (your sender's calibration will be different)

BMW E36 fuel level curve.png

Sensor Breakout Board

SensorX is a breakout / distribution board that will make it easier to use sensors that require pullup resistors as well as making available multiple ground and 5V Vref connections. The built-in pullup resistors are easily disabled by breaking a designated trace on the board. This board is compact; enough to be bundled inline with your wiring harness and covered in heat shrink tubing when complete.

SensorX board.png

Sensor X instructions