Connecting the eChook to the Car

Last updated 5 months ago

Now that the board is sending data to the phone, it needs to have some useful data to send. All of the external connections to the board go through pluggable terminal connectors. This makes it easy to wire into the vehicle’s harness with the screw terminals, and makes the board easy to remove from the car if necessary.

Label the connectors on the harness side to make it easier to identify them in future.

The diagram below shows the external interfaces to the board numbered, with details on each connection in the table. When connecting the sensors to the board, use this to identify which wire goes where!

Connector Pin Out

Connector

Pin

Signal

Use

Power In

3

Ground. This needs to be connected to the -ve battery commonly through the vehicle's chassis

Main grounding point for the board.

2

12v. Connects to the +ve terminal of the lower battery

Monitoring the lower battery voltage. Allows calculation of the two individual battery voltages.

1

24V input from the batteries.

Power to the board and 24V monitoring

Motor PWM

2

Ground reference

Ground for PWM line

1

5V PWM Output

A PWM output. Could control the drive motor, or a fan etc.

RPM

4

Ground reference

Ground for Hall Effect Sensors

3

Motor RPM - Pulsed 5V input from hall effect sensor

Signal from wheel hall effect sensor

2

Wheel RPM - Pulsed 5V input from hall effect sensor

Signal from motor hall effect sensor

1

5v Supply

5V supply for the Hall Effect Sensors

Therm

3

Ground reference

Ground connection for thermistors

2

Temp 2 - Line to thermistor

Connection to thermistor 2. Thermistor connects between here and ground

1

Temp 1 - Line to thermistor

Connection to thermistor 1. Thermistor connects between here and ground

Throttle

3

Ground reference

Ground reference for throttle

2

0-5v throttle input

Analogue input for a variable throttle, or digital for a push button. Needed for throttle logging

1

5v Supply

5v supply for the throttle

Ext Buttons

4

Button 2 Active LOW digital Input

Input for 'Switch Screen' button

3

Button 1 Active LOW digital Input

Input for 'Launch Mode' button needed for lap counting

2

Brake active Low or High (Code Dependant) digital input

Input from switch on brake lever, intended for logging brake use

1

Ground reference

Ground reference for buttons

Current

4

Ground reference

Ground reference for current sensor

3

Current Sensing Analogue input, 0-5v

Input from Current Sense pin

2

Current Reference Analogue input, 0-5v

Input from current sensor reference pin

1

5v Supply

5V to current sensor