2 layers44.5 × 46.9 mm
OSO SWAT B1-jig
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
31 parts2.1k
2 layers99 × 68 mm
Shift Indicator PCB
Rav4s/diy-shift-indicator1A K-Line shift indicator for manual transmission cars like my Mazda MX-5
- Size
- 99 × 68 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 25
- Pads
- 71
- Tracks, vias
- 121, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 May 2024
- Updated
- 25 Jul 2024
Overview
Shift Indicator PCB is an open-source printed circuit board by Rav4s, from the Rav4s/diy-shift-indicator repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 99 × 68 mm with 31 parts on 25 nets, routed with 121 tracks and 1 via.
Its parts include 9 resistors, 9 diodes, 5 connectors, 2 capacitors and 1 fuse.
README
README.mdK-Line (ISO9141) Shift Indicator
A DIY shift indicator for manual transmission cars like my Mazda MX-5 with a K-Line (ISO9141) OBDII interface. The device uses a series of LEDs that illuminate based on engine speed (RPM) to help the driver know when to shift gears in high-pressure situations. My technical writeup for this project, which includes rationale, insight into my design/development process, and future plans can be found here. Additionally, here are videos of the startup sequence and the device in action.
Features
- Displays engine RPM using a set of seven LEDs
- Has three distinct LED colors to show progression from low to high RPM (green -> blue -> red)
- Begins illuminating LEDs at the lower end of shift range (3.5k) and fully illuminates by the higher end (6k), with equal steps in between
- Mounts to the dashboard without significantly obstructing the driver's view of the road
- Doesn't require any modifications to wiring/electronics of the car (plug-and-play)
Files
The file structure of this repository is as follows:
diy-shift-indicator
│ K-Line (ISO 9141) Shift Indicator Writeup.pdf -- technical writeup on design/development process and future plans
│ LICENSE
│ README.md
│
├───Code -- all Arduino code
│ ├───arduino_obd_reader_display -- code for polling and displaying RPM using LED series
│ │ arduino_obd_reader_display.ino -- handles initialization/communication over LIN bus
│ │ LED_driver.ino -- defines functions to drive and reset LEDs, provides displayRPM functionality
│ │
│ ├───LED_test -- tester sketch to ensure LED series is working
│ │ LED_test.ino
│ │
│ └───modified_iso9141_library -- modified version of the OBD9141 Arduino library used in display program
│ OBD9141.cpp
│ OBD9141.h
│
├───Debug -- Saleae logic analyzer capture files, useful for debugging initialization/connection with ECU
│ First_Success_TX_and_KLINE_Logic.sal
│ RX_Logic.sal
│ TX_and_KLINE_Logic.sal
│ TX_Logic.sal
│
└───Design -- CAD/design files from the prototyping processParts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 220Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4, R5, R6, R7, R8, R9 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4 |
| 2 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 1kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 220pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 4.6kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | Arduino Connector | Connector_PinSocket_2.54mm:PinSocket_1x11_P2.54mm_Vertical | J1 |
| 1 | Batt | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J3 |
| 1 | Fuse (200mA) | Fuse:Fuseholder_Cylinder-5x20mm_Stelvio-Kontek_PTF78_Horizontal_Open | F1 |
| 1 | GND | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J2 |
| 1 | Green LED 1 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D3 |
| 1 | Green LED 2 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D4 |
| 1 | Green LED 3 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D5 |
| 1 | LIN | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J4 |
| 1 | OBDII Connector | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J13 |
| 1 | Red LED 1 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D8 |
| 1 | Red LED 2 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D9 |
| 1 | Yellow LED 1 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D6 |
| 1 | Yellow LED 2 | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D7 |
| 1 | ~ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | SN65HVDA195 |
Questions
How big is the Shift Indicator PCB PCB?
It measures 99 × 68 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Shift Indicator PCB use?
31 parts. 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 Shift Indicator PCB KiCad files?
From the Rav4s/diy-shift-indicator repository on GitHub, at the commit this page was made from: the board is Design/Electronics/KiCad (PCB)/Shift_Indicator_PCB/Shift_Indicator_PCB.kicad_pcb and its schematic Design/Electronics/KiCad (PCB)/Shift_Indicator_PCB/Shift_Indicator_PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Shift Indicator PCB 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).
Similar boards
- 2 layers65 × 30 mm
Rgb to hdmi
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
31 parts1kGPL-3.0 - 2 layers191 × 98.5 mm
MacroKeypad
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
31 parts915 - 2 layers39 × 45.2 mm
CH32V003F4P6-R0-1v1
openwch/ch32v003
CH32V003 is an ultra-cheap RISC-V MCU with 2KB SRAM, 16KB flash, and up to 18 GPIOs that sells for under $0.10
31 parts599 - 2 layers26.7 × 27.9 mm
Breakout board
Luos-io/luos_engine
Open-source and real-time orchestrator for cyber-physical-systems, to easily design, test and deploy embedded applications and digital twins.
31 parts546MIT - 2 layers100 × 50 mm
Pixelix
BlueAndi/Pixelix
Full RGB LED matrix, based on an ESP32 and WS2812B LEDs or emulated LEDs on TFT.
31 parts447MIT - 2 layers77.2 × 69.8 mm
- 2 layers103 × 55 mm
