bike speedometer

As far as I could search, this is the only and the first speedometer project here.

This is part of a bigger project of DIY Ebike.
#Intro:
speedometer is a device to measure the speed of your bike. The working principle is simple. A sensor is fixed to the bike's body, and it is triggered by, in our case, a magnet. So the magnet is attached to the wheel. By every turn the sensor senses the magnet once. Here, every second I count the number of turns which has been done. By knowing the circumference of the wheel I calculate the traveled distance, hence the speed of the bike. However, with one magnet it can measure minimum one turn per second which for 26 inch bike is ~7 km/hr ! to improve the resolution more magnets could be used.

#parts list:

1-arduino Nano
2- hall sensor A3144
3- resistor 220 ohm
4-LED
5-LCD ( I used Nokia 5110)
6-logic level converter(5v to 3.3v)
7-breadboard
8-wires
8- screws and nuts (M3)
10-battery ( I have an ebike, but any 5 V supply should be