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longboard_arduino

C++ (Arduino) Program to monitor longboard/skateboard stats (distance, speed, etc.)

Project Demo YouTube Video

Longboard Project Image 1

What You Will Need

  • Arduino Yún
  • Grove Kit
    • Grove Base Shield
    • Grove LCD RGB Screen
    • Grove Button Module
    • 2x Grove Connector Cables
  • Analog Hall Magnetic Sensor Module
  • 4x Male-to-Female Jumper Cables
  • Power Source (Portable USB Charger)
  • Micro SD Card
  • Micro SD Card Adapter
  • Micro USB Cable
  • A Magnet
  • A Longboard
  • PC / Laptop
  • Remote Web Server

Note: This can all be done with or without a breadboard - Using a breadboard will give more functionality for any future additions to the project. For now, I will explain it without using the breadboard.

How To Set Up (Hardware)

  • Connect the Grove Base Shield to the Arduino
  • Connect the Grove LCD to one of the I2C ports on the Base Shield using a Grove Connector Cable
  • Connect the Grove Button Module to pin 8 on the Base Shield using a Grove Connector Cable
  • Connect one Male-to-Female Jumper Cable from the Analog Pin A1 on the Base Shield to the A0 connection on the Analog Hall Module
  • Connect one Male-to-Female Jumper Cable from the GND (Ground) Pin on the Base Shield to the G connection on the Analog Hall Module
  • Connect one Male-to-Female Jumper Cable from the 5V Pin on the Base Shield to the + connection on the Analog Hall Module
  • Connect one Male-to-Female Jumper Cable from Pin 7 on the Base Shield to D0 connection on the Analog Hall Module
  • Attach the Analog Hall Module to the side of the longboard deck, inside of the wheel
  • Attach the magnet to the inside of the wheel

How To Set Up (Software)

  • Follow the steps in these repositories first:
  • Hold down the WLAN RST button on the Arduino Yún for 5 seconds
  • Connect your PC / Laptop to the Arduino's WiFi network
  • Go (http://arduino.local/) (Arduino) or (http://192.168.240.1) (Linino) in your browser
  • Enter the Arduino password (The default is arduino (Arduino) or doghunter (Linino))
  • The Arduino and Linino Dashboards have different layouts depending on the version
  • Find the section that allows you to Configure the WiFi
  • Locate the WiFi network that you want to connect your Arduino and PC / Laptop to
  • Enter your network password
  • Click Configure
  • When this process has finished, re-connect your PC / Laptop to the same WiFi network
  • Follow the steps for adding the necessary files to the Arduino here: Shell Script GitHub Repo
  • When you have done that, open /Longboard/Longboard.ino in the Arduino IDE
  • Change the values listed below under To Use
  • Upload the sketch from the Arduino IDE onto the Arduino via USB or WiFi
  • Wait for the LCD to light up and say "Starting up..."
  • Wait for the LCD to show "To Start Click Button"
  • Click the button attached to the Arduino
  • Spin the wheel with the magnet attached to it
  • The Distance and Speed should be displayed on the LCD
  • Click the button again
  • Information should be received back from the API via Shell and will be displayed on the LCD

To Use

  • Change {{WHEEL_CIRCUMFERENCE}} to the Circumference of the longboard wheel
  • Change {{MAGNET_NORMAL}} to the normal magnetic reading (Test out the Analog Hall Module separately first to find out what reading it normally gets - I find mine gets a normal reading of around 524/525 when no magnets are nearby)

How It Works

  • A magnet is attached to the inside of the wheel of the longboard, with a magnetic sensor (Analog Hall) attached to the side of the board
  • The user is prompted via the LCD to click the button attached to the Arduino to begin their skate
  • When the button is clicked, the device is monitoring the analog value coming from the magnetic sensor
  • The text file which sits on the Arduino's Linux file system is emptied for the new skate logs to be entered
  • When the value spikes above a certain threshold, this signals that the wheel had made a full rotation
    • The circumference of the wheel (distance travelled from one revolution of the wheel) is added to the total distance
    • The current speed is also calculated by dividing the circumference of the wheel by the time it took for the full revolution
    • The current distance and speed is being updated and displayed to the user via the LCD
  • The total amount of revolutions and the total speed (all revolutions accumulated) are incremented every 2 seconds
  • On the 2 second mark, the average speed is calculated and logged into the text file speeds.txt
  • This continues until the user clicks the button again to end their skate
  • When the button is clicked, the total distance is prepended with "d_" and logged into speeds.txt
  • A Shell Script which sits on the Linux file system is called by the command ash send_speeds.sh
  • This script Shell Script GitHub Repo sends data to the API API GitHub Repo
  • The response is then received back from the shell script containing the following data which was calculated by the API
    • The skate session ID number
    • The total length of the skate in seconds
    • The average speed throughout the session
    • The highest speed from the session
  • This data is displayed to the user via the LCD
  • The user is then prompted to press the button again to begin another skate session

Longboard Project Image 2