4 layers70 × 80 mm
Easyrelay
stamina/easyriderc
Motorcycle ECU STM32 ARM Cortex 4 source code and hardware PCB design
78 parts14GPL-3.0
4 layers70 × 80 mm
Easycomm
stamina/easyriderc14Motorcycle ECU STM32 ARM Cortex 4 source code and hardware PCB design
- Size
- 70 × 80 mm
- Copper layers
- 4
- Thickness
- 1.58 mm
- Parts
- 41
- Nets
- 83
- Pads
- 162
- Tracks, vias
- 285, 19
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 18 Jan 2022
- Updated
- 10 Feb 2022
Overview
Easycomm is an open-source printed circuit board by stamina, from the stamina/easyriderc repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 70 × 80 mm with 41 parts on 83 nets, routed with 285 tracks and 19 vias.
It is built around the W25Q256JV. Its parts include 5 resistors, 4 ICs, 2 connectors, 1 capacitor and 1 diode. It belongs with the STM32 boards of this library.
Main components
1README
README.mdEasyRider
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
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | Conn_01x01 | stamina_footprints:PinHeader_1x01_P2.54mm_Vertical | DX4, DX5, J7, J8, PA0, PA11, PA12, PA15, PB4, PB14, PC6, PC8, SX2, SX3 |
| 4 | MountingHole | stamina_footprints:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | TestPoint | stamina_footprints:PinHeader_1x01_P2.54mm_Vertical | 3V3, 5V, BUZZ, GND |
| 3 | 330 | stamina_footprints:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R4, R5 |
| 2 | LED | stamina_footprints:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | STATE1, STATE2 |
| 1 | 0.1uf | stamina_footprints:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | 1K | stamina_footprints:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2 |
| 1 | 2.7K | stamina_footprints:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | Adafruit_Bluetooth | stamina_footprints:Adafruit_Bluetooth | U1 |
| 1 | Adafruit_GPS | stamina_footprints:Adafruit_GPS | U2 |
| 1 | Adafruit_IMU | stamina_footprints:Adafruit_IMU | U3 |
| 1 | Buzzer | stamina_footprints:Buzzer_25.4mmPP | BZ1 |
| 1 | D_Schottky | stamina_footprints:D_SOD-323F | D1 |
| 1 | LEFT Morpho | stamina_footprints:PinHeader_2x19_P2.54mm_Vertical | J2 |
| 1 | LOGO | stamina_footprints:EasyRider_logo1 | G*** |
| 1 | LOGO | stamina_footprints:EasyRider_logo2 | G*** |
| 1 | NPN2222A | stamina_footprints:SOT-23_3_HandSoldering | Q1 |
| 1 | RIGHT Morpho | stamina_footprints:PinHeader_2x19_P2.54mm_Vertical | J1 |
| 1 | W25Q256JV | stamina_footprints:WSON-8-8x6mm_P1.27mm | U4 |
Questions
How big is the Easycomm PCB?
It measures 70 × 80 mm and has 4 copper layers, 1.58 mm thick.
What parts does the Easycomm use?
41 parts, built around the W25Q256JV. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Easycomm KiCad files?
From the stamina/easyriderc repository on GitHub, at the commit this page was made from: the board is kicad/easycomm/easycomm.kicad_pcb and its schematic kicad/easycomm/easycomm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Easycomm design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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