Mountain Bike Data Logger - The Box

Background:

This is part of a much bigger system design which is detailed here:  Mountain Bike Data Logger

Detail:

The rear shock stroke sensor is specific to my shock, Cane Creek Coil IL, but likely easy to modify design for others.

• The top part, which holds the magnetic target, clamps onto the body.

• The bottom part, which holds the sensor, is held in place with a special bracket clamped between spring and perch.

• Still allows climb switch adjustment.

• Voltage divider is used to reduce voltage for Artemis OLA board. This is built into wiring harness.

Print Settings:

• I used PETG with 60% infill.  

• Default "snug" supports were used for the 4-wall box, stand-off piece and battery holder portion of bottom piece.  

• Organic supports were used for the top piece to hold up the GPS sensor mount

• Otherwise no supports needed

Parts Needed:

• SpakFun Open Log Artemis with IMU

• SparkFun GPS Breakout - NEO-M9N, U.FL (Qwiic)

• Taoglas Limited AP.10E.07.0039B

• SparkFun Qwiic Cable Kit

• 3* SparkFun Qwiic 12 Bit ADC - 4 Channel (ADS1015)

• Sandisk SDSQXCD-128G-GN6MA Extreme Pro Microsdxc 128gb+sd Flsh Adapter 200mb/s 90mb/s A2 C10 V30 U

• Push Buttons with LED

• Sparkfun 2Ah lithium ion battery

• 12v DC/DC Converters

• 33K ohm Resistor 1/2w (0.5Watt) ±1% Tolerance Metal Film Fixed Resistor

• 47K ohm Resistor 1/2w (0.5Watt) ±1% Tolerance Metal Film Fixed Resistor

• Deutsch 12-pin 14-16AWG Flange Connector Kit Solid Contacts

Fasteners Needed:

• M3-0.5 x 8mm Flat Head Socket Head Cap Screws

• M3-0.5 x 20mm Standard Socket Head Cap Screws (for stand-offs)

• M3-0.5 x 6mm Button Head Socket Head Cap Screws

Installation: 

• All parts should bolt together without much issue.  

• The GPS antenna is just super glued to mount

• The 12V DC/DC up converters are stuck on with double sided tape

• Be gentle with battery.  It should slide in and out freely.  If you puncture the skin it could have thermal run-away.

• Details of wiring covered in main project page:  Mountain Bike Data Logger

• Github Code:  SparkFun Artemis Open Log Code (special fork)

• Github Code:  SparkFun ADS1015 A/D Converter (special fork)

Disclaimer:

This is just an experiment and I make no claims or promises on safety. What you do to your bike is your business and your decisions. I am just giving ideas on how we can instrument our mountain bikes to learn. This project does add sensors very close to rotating components that could stop your bike quick. Install at your own risk.