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eBike Electrical Diagrams

This page is being developed at the moment, still in beta mode.

1. General Wiring Diagram

2. Motor - Controller Diagram

Wire	Role	Expected Voltage (measured to ground)
Red	Power	Just under 5 V
Ground (GND)	Ground	0 V
Small Yellow	Yellow Hall Sensor	Toggle between 0 V and 5 V as you engage motor or pedal backwards
Small Blue	Blue Hall Sensor	Toggle between 0 V and 5 V as you engage motor or pedal backwards
Small Green	Green Hall Sensor	Toggle between 0 V and 5 V as you engage motor or pedal backwards
Thicker Yellow	Yellow Phase Wire	No need to measure voltage
Thicker Blue	Yellow Blue Wire	No need to measure voltage
Thicker Green	Yellow Green Wire	No need to measure voltage
White wire	Speed hall sensor	Toggle between 0 V and 5 V as you engage motor or pedal backwards

Failure indicators:

Red to black voltage lower than 3 V
Any hall sensor stuck at a certain value when engaging motor or spinning it backwards

Hall sensor failure symptoms on ebike:

Motor makes loud noises, may even stop after 1-3 seconds of working
Motor does not output significant torque

3. LCD Screen - Controller Diagram

Wire	Role	Expected Voltage (measured to ground)
Red	Battery Power	Same voltage as battery (yes, it can be more than 60 V)
Ground (GND)	Ground	0 V
Blue	ON Key: Tells the controller when LCD is on	0 V when off, Almost same voltage as battery when on (yes, it can be more than 60 V)
Yellow	Receiving UART Communication Data	UART (alternating 0 - 5V communication)
Green	Transmitting UART Communication Data	UART (alternating 0 - 5V communication)

Failure indicators:

If red to ground is not equal to battery voltage, issue might be controller or battery, not LCD
If red = battery voltage, and you try to turn LCD on, but blue stays @0 V, likely LCD issue

Notes:

UART is a communication protocol, where the LCD and controller talk via bytes of data, which can not be properly decoded via a multimeter, and requires a tool like a logic analyzer

3. Throttle - Controller Diagram

Wire	Role	Expected Voltage (measured to ground)
Red	Power	5 V
Ground (GND)	Ground	0 V
White	Throttle hall signal	When throttle is off: around 0.6-0.8 V When throttle is on: around 4.2V

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