2 layers36 × 36 mm
2 layers40.6 × 26.7 mm
IO Expander 20x40
iNavFlight/hardware11INAV I2C IO Expander board offers 8 digital outputs.
- Size
- 40.6 × 26.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 20
- Pads
- 64
- Tracks, vias
- 78, 0
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 18 Jul 2019
- Updated
- 27 Sep 2021
Overview
IO Expander 20x40 is an open-source printed circuit board by iNavFlight, from the iNavFlight/hardware repository on GitHub. It is a 2-layer board of 40.6 × 26.7 mm with 7 parts on 20 nets, routed with 78 tracks and 0 vias.
It is built around the PCF8574AP and ULN2803A. Its parts include 3 connectors, 2 ICs and 2 switches.
Main components
2
PCF8574AP
DIP-16-40℃~+85℃ 100kHz 10uA 2.5V~6V 25mA 300uA 8 8 Cascade and address expansion、Built-in LED driver I2C Interrupt Output Quasi-bidirectional output DIP-16 I/O Expanders ROHSHGSEMII/O Expanders
ULN2803A
SOP-18-300mil-40℃~+85℃ 0.93mA 100uA 15pF 20uA 30V 500mA 50V 8 SOP-18-300mil Darlington Transistor Arrays ROHSUMWDarlington Transistor Arrays
README
IO Expander/README.mdINAV I2C IO Expander board
INAV I2C IO Expander board offers 8 digital outputs.
- All elements are THT for easy soldering by beginners
- 36x36mm PCB with 30.5x30.5mm mounting holes fits on top of most flight controllers
- Each channel can be loaded to around 300mA on 3.3V
- Switching is done on the low side
- In case of inductive load, COM port has to be connected to the Vcc
- Max voltage ULN2803 can handle is 50V. It is 8S ready, however 12-16V is recommended
- Connects via I2C to any INAV compatible flight controller
- Supported in INAV 2.6 via Logic Conditions in Programming Framework
- Buttons are not yet supported by INAV
Example usage
BOM
- 1x PCF8574 THT
- 1x ULN2803A THT
- 2x Tactile button
PCB can be ordered via OSH Park
Parts
7Questions
How big is the IO Expander 20x40 PCB?
It measures 40.6 × 26.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the IO Expander 20x40 use?
7 parts, built around the PCF8574AP and ULN2803A. 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 IO Expander 20x40 KiCad files?
From the iNavFlight/hardware repository on GitHub, at the commit this page was made from: the board is IO Expander/IO Expander 20x40.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the IO Expander 20x40 design in my own project?
Its repository states no licence, so its author keeps all rights: ask iNavFlight before reusing the design.
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