SmartCycle

Liz Callahan, Jimmy Duke, Alex

Kaup, Shaggy Lubetski, John Sexton

Problem Description

➔ 130,000 injury-inducing accidents annually in US

➔ 1,000 deaths from biking accidents annually

➔ $23 billion lost in injury expenses, hospital expenses, work/productivity

losses, etc.

➔ Stationary bikes provide information and data but do not allow you to be

mobile

➔ High quality stationary bikes (ex. Peloton) are expensive ($1500-$2500)

Proposed Solution

➔ Automatically shifts gears to facilitate a smooth riding experience

➔ Algorithm for gear shifting will take into account pedal speed and bike incline

➔ A solenoid actuator will be used to manually shift the gears

➔ Aggregates information on heart rate, distance, and speed

➔ All data will be displayed to the user on an LCD display

➔ The data will transmitted via Bluetooth to an smartphone app

➔ This app will be integrated into the Apple Health app

➔ Data on calories burned will be included and will be calculated with force of gravity

relative to the incline, pedaling speed, and gear level resistance

Demonstrated Features

➔ Can eﬀectively use a motion sensor and a gyroscope to determine

what gear the bike should be in

➔ Automatically shifts the gear to the ideal gear setting based on

incoming data

➔ Has the ability to electrically interface with the mechanical gear shifter

➔ Safety check to prevent gear switching if the pedals aren’t actively

turning

➔ Has an LCD display that shows exercise stats such as distance traveled,

bike gear, etc.

➔ Connects using Wiﬁ and Bluetooth to a smartphone app that analyzes

bike workouts

➔ Measures heart rate of rider using a sensor

Available Technologies – Push-Pull Solenoid & LCD Panel

➔ Device to convert electrical

power to mechanical power

➔ LCD panel will be put on the

handlebars as the user

interface

➔ Helpful exercise

information, such as

distance traveled, calories

burned, and current gear

will be displayed

Available Technologies – Motion Sensor & Gyroscope

➔ Gyroscope

➔ Senses tilt angle of bike

➔ Used in conjunction with motion

sensor to determine optimal gear

choice

➔ Passive Infrared (PIR)

sensor

➔ Detects rotational pedal

speed using infrared

emissions from the users

foot

Available Technologies – Power

➔ 2Ah, 3.7 LiPo battery

➔ Projected 300 hours of

battery life

➔ USB type C interface for

recharging

Available Technologies – Sensor for Distance

➔ Hall Eﬀect sensor to determine

distance bike travels

➔ Works by attaching a sensor on

the bike frame and a magnet on a

spoke of the bike wheel

➔ Sensor used to determine RPM of

bike wheels which can be

converted to linear distance

https://www.electronics-tutorials.ws/electromagnetism/hall-eﬀect.html

Available Technologies – Heart Rate Monitor

➔ Example heart rate sensor circuit

for Arduino

➔ Uses an infrared emitter LED to

detect blood ﬂow

➔ Use this as a basis to make our

own board

Engineering Content

➔ We will have to start by designing the individual interfaces on the diﬀerent parts of the bike.

➔ We will need someone working on…

◆ The electrical-mechanical interface meant to move the gear-shifter and where to angle

the solenoids

◆ The code for the ﬁtness app and the bluetooth component connecting to the heartbeat

sensor

◆ Programming the diﬀerent functions of the system into the board and how all of the

diﬀerent components will wire to the board

● the speed and distance analysis with the wheel sensor and LCD

● the safety check with the pedal sensor

● the motion sensor boundaries and gyroscope settings for the gear shifter to act

upon

◆ How to ﬁt the diﬀerent devices to the bike and assemble everything together so that the

whole SmartCycle functions as one cohesive system

System Block Diagram

Sensor Map

Conclusion

➔ This product will make casual biking far more enjoyable and simple for

the rider and will likely lead to fewer accidents for those who commute by

bike

➔ It will also allow the technological beneﬁts of a traditionally stationary

exercise bike to translate to an outdoor setting

➔ We believe that this product will eﬀectively serve a generation becoming

increasingly interested in biking as a form of transportation