Arduino•5mo ago

bike shifter, limiter and rpm reader

in this "big" project im going to create a shifter, rpm reader and limiter for my 50cc bike

Robu19OP•8/20/25, 11:02 PM

i'm still in the planning phase so any help is appriciated since i'm still a beginner

Robu19OP•8/20/25, 11:02 PM

My plan is this:

Robu19OP•8/20/25, 11:03 PM

SHIFTER:

Robu19OP•8/20/25, 11:07 PM

setup:
arduino uno, a button, a transistor / relè
how it works:
0) the button is connected to arduino and the transistor connects the spark plug cable(obv when it's stillat 12v)
1) while pressing up on the lever my foot will press the button attached under the lever
2)once the button is presed arduino will cut power from the transistor for a set amount of time (40/100 ms) making it so that there is no spark
3)without spark the rpm drop and i can shift without using clutch or removing gas

Robu19OP•8/20/25, 11:12 PM

RPM reader
setup:
same arduino, a resistance, voltage limiter
how it works:
0)a resistance and a vloltage limiter (idk the order pls help) connect the spark plug cable to arduino

Robu19OP•8/20/25, 11:12 PM

1) every revolution there is a signal in the spark plug cable, arduino detects that

Robu19OP•8/20/25, 11:14 PM

2) arduino gets the delay between 2 signals and after some quick math i don't remember it calculates the rpm
3) the rpm is shown either trough some leds or a screen

Robu19OP•8/20/25, 11:14 PM

RPM LIMITER
setup, the two combined setups
how it works:

Robu19OP•8/20/25, 11:15 PM

1) if the rpm go over a certain limit it cuts off current from the transistor making the rpm drop, this limits the rpm to what i want

Robu19OP•8/20/25, 11:16 PM

i still have to figure out how to power the arduino and probably the code, if you have any suggestions or noticed a mistake i did please tell me

bike shifter, limiter and rpm reader

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