2 layers36 × 36 mm
2 layers14.9 × 7.5 mm
PowerSwitch
iNavFlight/hardware11INAV I2C IO Expander board offers 8 digital outputs.
- Size
- 14.9 × 7.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 7
- Pads
- 19
- Tracks, vias
- 27, 25
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 18 Jul 2019
- Updated
- 27 Sep 2021
Overview
PowerSwitch is an open-source printed circuit board by iNavFlight, from the iNavFlight/hardware repository on GitHub. It is a 2-layer board of 14.9 × 7.5 mm with 10 parts on 7 nets, routed with 27 tracks and 25 vias.
It is built around the AO3400 and AO3401. Its parts include 4 resistors, 3 connectors and 2 transistors.
Main components
2README
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
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 6k8 | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1, R3 |
| 1 | PowerSwitch:LOGO_INAV | LOGO | |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R4 |
| 1 | 47k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R2 |
| 1 | AO3400 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | AO3401 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | CTRL | PowerSwitch:PadHeader_1x01_P2.54mm | J2 |
| 1 | IN | PowerSwitch:PadHeader_1x02_P2.54mm | J1 |
| 1 | OUT | PowerSwitch:PadHeader_1x02_P2.54mm | J3 |
Questions
How big is the PowerSwitch PCB?
It measures 14.9 × 7.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PowerSwitch use?
10 parts, built around the AO3400 and AO3401. 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 PowerSwitch KiCad files?
From the iNavFlight/hardware repository on GitHub, at the commit this page was made from: the board is PowerSwitch/PowerSwitch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the PowerSwitch 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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