Bike Speedometer

By PaulFinch
arduino

Introduction

This Bike Speedometer tracks my cycling activies. It was made from a Arduino Esplora.

Details

  • The Arduino Esplora is connected to the bike sensor (Hall effect), to a port supporting interrupts. Everytime the magnet, on the wheel, goes near by the bike sensor, a signal is sent to the interrupt, invoking the StepIncrement() function.

  • Timer1: Every seconds, the program recalculates the traveled distance from the steps count. For this, the #define WHEEL constant needs to be set as the wheel circumference.

  • Timer2: Every 10 seconds, the program recalculates the current and average speed from the distance traveled. The display mode is toggled from AVG to NOW and elapsed time to remaining time (60 Minutes). If a SDcard is connected, the activity data is saved in a file. The name of the file is generated from a number stored in the EEPROM, and incremented at initialization (the filename is displayed at boot). The blue LED blinks once.

  • Every loops: Controls are read and the display is refreshed.

Display

Speedometer

NOW PANEL

  • Speed (km/h)
  • Step speed (steps/minute)
  • Distance (m)
  • Difficulty

AVG PANEL

  • Average Speed (km/h)
  • Average Step speed (steps/minute)
  • Elapsed Time / Remaining Time
  • Difficulty

Red Spot: The Red spot indicates that a SDcard was detected.

Controls

  • BUTTON LEFT: Toggle Display (NOW / AVG)
  • BUTTON RIGHT: Toggle Time Display (Elapsed / Remaining)
  • BUTTON BOTTOM: Reset Counters
  • BUTTON TOP: Start / Pause
  • SLIDER: Set Difficulty

LED: The Red LED indicates PAUSE status. The Green LED indicates RUNNING status.

Speedometer

Code

see files here