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easyriderc

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@stamina

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KiCad projectAll 50 files, ready to open in KiCad1.3 MB
For fabricationGerbers, drill, pick-and-place and BOMGerbers and drill zip534 KBGerbers and drill zip: easycomm332 KBPick and place (CSV)6.3 KBPick and place (CSV): easycomm3.0 KBBOM CSV12 KB
Schematic PDFEvery sheet, to read or print236 KB
3D modelThe board with its parts, for an enclosure (GLB)3D model (GLB)7.4 MB3D model (GLB): easycomm3.4 MB
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README

EasyRider

EasyRider REV C is a motorcycle telemetrics project, developed specifically for my Honda C90 classic bike.

The software is written in C using the libopencm3 library for the STM32 446RE Arm Cortex M4 microcontroller.

The PCB's were created with Kicad 6, you'll find all gerbers/schematics/datasheets in the /docs directory.

Functionality

EasyRider basically does the following things:

  • Controls the lighting system: indicators, rear light, brake light, etc.
  • Controls the claxon
  • Contains an alarm system, based on an IMU
  • Reads the motorcycle battery voltage and the power draw of the board
  • Contains a buzzer for some startup/alarm sounds
  • Reads the RPM of the motor via the CDI, through an opamp and optocoupled circuit
  • Logs GPS coordinates and timestamps of events via the external RTC
  • Sends all telemetry data over Bluetooth and writes it to onboard Flash.

Overall changes/benefits compared to Rev B

  • Way more powerful -> Main board: STM32 Nucleo ARM Cortex 4 32bit mcu with Floating Point Unit
  • Way easier debugging with SWD (Serial Wire Debug)
  • Smaller form-factor size and more modular -> 2 detachable shields -> riser/daughter boards: 3x stack of 70mmx80mm boards, connected with double 2x19pin headers (76 pins total)
  • EasyRelay board: PSU/Relay grid with connectors and 2x 16 port I/O expander IC's
  • EasyComm boards: GPS/Bluetooth/IMU/Flash Storage/Sound(buzzer)
    • Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates - Version 3
    • Adafruit LSM6DS33 + LIS3MDL - 9 DoF IMU with Accel / Gyro / Mag - STEMMA QT Qwiic
    • Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE)
  • 4-layer board instead of 2-layer -> less noise, crosstalk
  • Lower power -> most IC's at 3.3V, relay coils at 5V
  • Lower power -> switching 5V Voltage Regulator instead of Linear
  • Radio connectivity: Bluetooth LE low power instead of power-hungry Wifi
  • Fast storage for logging/settings/unique ID's/reboots etc. -> 256MBit WinBond SPI flash memory.
  • New smaller molex connectors (Mini-Lock)
  • More decoupling cap pads at longer traces
  • Seperate 12V higher current wire for claxon relay
  • Shift registers/IO expander IC before relays/darlington transitor arrays -> less pins needed on Cortex
  • Shift registers/IO expander IC before input sense signals -> less pins needed on Cortex

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