Throttle Input
Throttle input is useful to log to see how the car is being driven, however due to the number of different ways throttles are implemented on cars there are a few methods of interfacing it to the eChook.
A throttle input is also needed for the apps lap counter feature, as this uses the throttle to determine race start.
Finally, the eChook will take a variable throttle and output a PWM signal that can be used as an input to a higher power motor driver circuit. The green LED on the eChook board is connected to this output.
Throttle Configuration
There are two main ways that teams tend to use the throttle input with the eChook, depending on whether a separate motor control system is being used (be that simple relays or a more sophisticated controller such as a 4QD)
Logger only - the motor control is handled by a different system and the eChook is just used to log the the throttle input
Motor control (Fully Connected) - the PWM output of the eChook is used to control the motor, according to the throttle input and any processing on the eChook.
Logger only:
The eChook needs to share the same ground reference, normally battery negative, as the motor control system, and just the throttle signal should be fed into the eChook board
Not Connected
5V
Throttle Signal to Motor Controller
In
Not Connected - shared GND
GND
If using a 4QD controller DO NOT connect the 4QD Ground to the eChook Ground.
The 4QD controllers have built in reverse polarity protection (unless you have an extreme version of a controller that specifically states it has no reverse polarity protection). The circuit they've used to achieve this creates a small voltage offset between the 4QD ground and the chassis/eChook ground. If the two are connected and the motor is run, significant current will attempt to flow through the connecting wire, potentially melting it, and likely causing damage to the eChook board.
Fully Connected
The eChook provides 5V power and the ground reference as well as reading the throttle output
5V Power (If required)
5V
Output Signal
In
GND
GND
These tables apply to each different type of throttle described below
Throttle Types
As well as different ways of connecting the throttle, there are multiple common types of throttle used in Greenpower racing, and the connections are different for each:
This is the input that the eChook board is designed for and is the commonly used eBike or eScooter hall effect throttle, or any potentiometer based throttle and if a variable throttle input is used, it is likely that it already works in this voltage range, however confirm this with a multimeter before attaching anything.
This type of throttle can be connected directly to the eChook as per the tables above, depending on whether the eChook is acting as a logger only, or for motor control.
Last updated
Was this helpful?