eChook GPT Documentation
  • Welcome to the eChook nano documentation
  • System Overview
  • The eChook Nano Kit
    • Versions
  • Build Instructions (Kit V1.x)
    • Build Steps Photos
    • First Power On
  • Build Instructions (Kit V2+)
  • Programming the Arduino
    • Install Arduino IDE
    • Arduino Drivers
    • Download the eChook Arduino Code
    • Programming the Arduino
  • Setting up the Bluetooth
    • Pairing with a phone
  • Connecting the eChook to the Car
    • Power and Voltage
    • Current Sensor
    • Throttle Input
    • External Buttons and Brake
    • Temperature Sensors
    • Wheel and Motor RPM
    • PWM Output
  • Calibrating the eChook
    • Wheel Speed and Motor RPM
    • Temperature
    • Voltage
    • Current
  • Using the App
    • Pair eChook to Phone
    • Setting up the App
    • Logging Data
    • Lap Counting
  • Telemetry (Live Data)
    • eChook Live Data
    • Node-Red Integration
    • DIY Web Dashboard
  • Using the Data
  • Circuit Schematics
    • 12 and 24v Inputs
    • Temperature Inputs
    • Bluetooth Module
    • Throttle Input
    • Current Input
    • Button Inputs
    • RPM Inputs
    • PWM Output
    • Power Regulator
    • Expansion Port
  • All about the Arduino nano
    • The eChook nano Code
  • Bluetooth Communication
    • Bluetooth Packet Encoding
    • Bluetooth Packet Decoding
  • Experimental Section
    • GUI Calibration
  • eChook Accessories
  • DIY eChook
  • Spare Parts
  • Troubleshooting
  • Contributing
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  • Power to the Board
  • 24v Monitoring
  • 12v Monitoring

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  1. Connecting the eChook to the Car

Power and Voltage

PreviousConnecting the eChook to the CarNextCurrent Sensor

Last updated 6 years ago

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Power to the Board

To power the board in the car, connect the 0v pin on the ‘Power In’ socket to ground, and the +24v pin to the 24v battery supply on the car. To comply with greenpower regulations it is suggested to take power from after the isolator switch and the board must have it’s own fuse, nominally 5A, although 1A may be preferable.

24v Monitoring

This is the total battery voltage reading. It is taken directly from the boards power source, so no extra connections are needed.

12v Monitoring

This monitors the voltage of the ‘lower’ battery, allowing the system to monitor and log the voltages of both 12v batteries. This will show if one of the batteries is in a worse condition than the other.

The 12v monitoring requires a wire from the positive terminal of the lower battery, as shown by the wire_12V label in the diagram below:

As this is a wire from the battery it requires a fuse of it’s own, a low value (<1A) is recommended but 5A is sufficient. As this is simply a reference wire, no current will be drawn through it, so a thin wire can be used, however ensure that the wire is able to carry a higher current than the fuse that it is fitted with.