Connecting the eChook to the Car
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.
There is a post with some guidance to building a Greenpower car wiring harness on the eChook forum here.
The image below shows the external interfaces to the board numbered, with details on each connection in the table.
eChook nano v1.3.1 Board Bottom View with connector pinouts
Label the connectors on the harness side to make it easier to identify them in future.

Connector Pin Out

Connector
Signal
Use
Power In
1
24v
Power and 24V monitoring
2
12v
Monitoring the lower battery voltage.
3
Ground
Main grounding point for the board.
Motor PWM
1
5V PWM Output
A PWM output. Could control the drive motor, or a fan etc.
2
Ground reference
Ground for PWM line
Therm
1
5v Supply
5V supply for the Hall Effect Sensors
2
Motor RPM
Pulsed 5v signal from motor hall effect sensor
3
Wheel RPM
Pulsed 5v signal from wheel hall effect sensor
4
Ground reference
Ground for Hall Effect Sensors
Therm
1
Temp 1 - Line to thermistor
Connection to thermistor 1. Thermistor connects between here and ground
2
Temp 2 - Line to thermistor
Connection to thermistor 2. Thermistor connects between here and ground
3
Ground reference
Ground connection for thermistors
Throttle
1
5v Supply
5v supply for the throttle
2
0-5v throttle input
Analogue input for a variable throttle, or digital for a push button.
3
Ground reference
Ground reference for throttle
Ext Buttons
1
Ground reference
Ground reference for buttons
2
Brake Switch
Brake input for logging brake use
3
Button 1 Active LOW digital Input
Input for 'Race Start' button needed for lap counting
4
Button 2 Active LOW digital Input
Input for 'Switch Screen' button.
Copy link