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
    • Power
    • Arduino
    • Bluetooth
    • Current Sensor
    • Incorrect Data
  • Contributing
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  1. Connecting the eChook to the Car

Current Sensor

PreviousPower and VoltageNextThrottle Input

Last updated 3 years ago

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Current is probably the most useful data to have on a greenpower car as it gives the best indication of how quickly the batteries are being discharged.

The current sensor needs two 47nF capacitors and one 4.7nf capacitor soldered to it, as close to the pins as possible as shown in the diagram below:

Solder the wires and the capacitors directly to the current sensor pins. It is advisable to add some form of stress relief so that if the wires are pulled, the solder joints don't take the force. This can be achieved with some hot glue around the connections, cable ties (as shown below) or tape etc.

This sensor needs to be placed around the main 24V cable from the battery. A convenient location is often next to the circuit breaker. The orientation of this sensor is important; if it is the wrong way around it will not read a current. The correct orientation is shown below - note the lip around the right hand side of the sensor aperture.

Now connect the 5V, 0V, Output and Vref to the eChook board as described in the table at the start of this section.

From Kit version 1.4 a PCB breakout board for the current sensor is included to carry the LEM sensor, three capacitors, and a connection to the vehicle harness.

datasheet