8 layers120 × 60 mm
Jetson orin baseboard
antmicro/jetson-orin-baseboard
Baseboard targetting the NVIDIA Jetson Orin Nano and Jetson Orin NX
681 parts305Apache-2.0
2 layers27.2 × 48.2 mm
PAStoThrottle
vjapolitzer/PAStoThrottleAn intuitive e-bike controller that translates a simple PAS (Pedal Assist Sensor) signal into a smooth throttle output.
- Size
- 27.2 × 48.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 34
- Pads
- 85
- Tracks, vias
- 68, 27
- Pours
- 31
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 Jun 2026
- Updated
- 6 Jun 2026
Overview
PAStoThrottle is an open-source printed circuit board by vjapolitzer, from the vjapolitzer/PAStoThrottle repository on GitHub, published under the MIT licence. It is a 2-layer board of 27.2 × 48.2 mm with 26 parts on 34 nets, routed with 68 tracks and 27 vias.
It is built around the ESD9X5.0ST5G and RC0402FR-0710KL. Its parts include 9 resistors, 7 diodes, 3 capacitors and 3 connectors. It belongs with the audio and music and sensors and measurement boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2README
README.mdPAS to Throttle Converter
An Arduino Nano R4-based controller that converts a cadence-based PAS (Pedal Assist Sensor) signal into a smooth throttle output, giving a more responsive, torque-sensor-like feel on an e-bike without replacing the sensor hardware.
How it works
The PAS sensor produces pulses as you pedal — 14 per revolution on the supported sensor. The firmware measures pulse intervals to calculate cadence (RPM) in real time, applies asymmetric EMA smoothing to produce a natural acceleration/deceleration feel, and drives a 12-bit DAC output that feeds directly into the motor controller's throttle input.
Features
- 7 assist levels (0 = off, 1–6 = eco through overdrive) with RGB LED color coding
- Cadence-to-throttle mapping with configurable min/max RPM and power scale per level
- Asymmetric EMA smoothing — fast attack, slow decay for a natural pedal feel
- Walk mode — hold OK button for a low-speed assist output
- Calibration mode — trim the throttle floor (minDAC) live and save to EEPROM
- Serial plotter telemetry for tuning
Hardware
| Component | Detail |
|---|---|
| MCU | Arduino Nano R4 (Renesas RA4M1) |
| Throttle output | 12-bit DAC on pin A0 |
| PAS input | 14-magnet sensor on pin D2 (interrupt-driven) |
| Buttons | Up D4 / Down D3 / OK D5 |
| Protection | External pull-ups and TVS diodes on all inputs |
Repository structure
PCB/ KiCad schematic and PCB layout
FW/ PlatformIO firmware (Arduino framework)Firmware
The firmware is a PlatformIO project targeting the nano_r4 board. Open FW/PAStoThrottle/ in VS Code with the PlatformIO extension, or build from the CLI:
cd FW/PAStoThrottle
pio run
pio run --target uploadButton controls
| Action | Effect |
|---|---|
| Up / Down press | Change assist level |
| Hold OK (1 s) | Walk mode (active while held) |
| Hold Up + Down (2 s) | Enter calibration mode |
| In calibration: Up / Down | Adjust throttle floor ±10 DAC counts |
| In calibration: Hold OK (2 s) | Save to EEPROM and exit |
PCB
The KiCad project lives in PCB/PAStoThrottle/. It uses the arduino-kicad-library (included, CC-BY-SA-4.0) for the Nano R4 footprint and symbol. Fabrication outputs (gerbers, BOM, pick-and-place) are in PCB/PAStoThrottle/production/.
License
MIT — see LICENSE.
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | ESD9X5.0ST5G | Diode_SMD:D_SOD-923 | D1, D2, D3, D4, D5, D6, D7 |
| 5 | 220 | Resistor_SMD:R_0402_1005Metric | R5, R6, R7, R8, R9 |
| 4 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4 |
| 3 | 0.47μ | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3 |
| 2 | Conn_01x03 | Connector_PinHeader_2.00mm:PinHeader_1x03_P2.00mm_Vertical | J1, J2 |
| 1 | Arduino_Nano_R4 | arduino-library:Arduino_Nano_R4_Tile | A1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical | J3 |
The 23 most common of 26 parts.
Questions
How big is the PAStoThrottle PCB?
It measures 27.2 × 48.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PAStoThrottle use?
26 parts, built around the ESD9X5.0ST5G and RC0402FR-0710KL. 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 PAStoThrottle KiCad files?
From the vjapolitzer/PAStoThrottle repository on GitHub, at the commit this page was made from: the board is PCB/PAStoThrottle/PAStoThrottle.kicad_pcb and its schematic PCB/PAStoThrottle/PAStoThrottle.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PAStoThrottle design in my own project?
Its repository publishes it under the MIT 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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