eChook GPT Documentation
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eChook GPT Documentation
Welcome to eChook GPT
System Overview
The eChook Nano Kit
Build Instructions
Programming the Arduino
Setting up the Bluetooth
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
Using the App
Telemetry (Live Data)
Using the Data
Circuit Schematics
All about the Arduino nano
Bluetooth Communication
DIY eChook
Spare Parts
Troubleshooting
Contributing
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Power and Voltage

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.
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Connecting the eChook to the Car
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Current Sensor
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Power to the Board
24v Monitoring
12v Monitoring