4 layers115.5 × 96.2 mm
Closed deck x4
OpenLogicEFI/Hardware
Hardware is based off an open source project called Speeduino by Josh Stewart.
245 parts19
2 layers35 × 22 mm
IR UART
ADBeta/IR_UARTA Minimal cost, maximum flexibiity USB->UART->IR Converter PCB, with USB-C
- Size
- 35 × 22 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 18
- Pads
- 67
- Tracks, vias
- 98, 18
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 23 Mar 2026
- Updated
- 2 Apr 2026
Overview
IR UART is an open-source printed circuit board by ADBeta, from the ADBeta/IR_UART repository on GitHub. It is a 2-layer board of 35 × 22 mm with 18 parts on 18 nets, routed with 98 tracks and 18 vias.
It is built around the CH340N and AO3400A. Its parts include 7 resistors, 4 transistors, 2 capacitors, 1 IC and 1 diode. It belongs with the interfaces and adapters boards of this library.
Main components
2README
README.mdUSB IR UART Adapter
Converts USB to UART, then to Inverted or Normal IR Signalling.
Uses any generic IR LED and IR Phototransistor.
(c) ADBeta 2026
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 3K3 | Resistor_SMD:R_0603_1608Metric | R2, R3, R4, R5 |
| 3 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 2 | 5K1 | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 10nF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 120R | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | CH340N | Package_SO:JEITA_SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | IR_LED | LED_THT:LED_D3.0mm_Clear | D1 |
| 1 | IR_PHOTO | LED_THT:LED_D3.0mm_Clear | Q4 |
| 1 | RECEIVE_SELECT | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | TRANSMIT_SELECT | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | USB_C | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J1 |
Questions
How big is the IR UART PCB?
It measures 35 × 22 mm and has 2 copper layers, 1.6 mm thick.
What parts does the IR UART use?
18 parts, built around the CH340N and AO3400A. 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 IR UART KiCad files?
From the ADBeta/IR_UART repository on GitHub, at the commit this page was made from: the board is IR_UART.kicad_pcb and its schematic IR_UART.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the IR UART design in my own project?
Its repository states no licence, so its author keeps all rights: ask ADBeta before reusing the design.
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