4 layers80 × 50 mm
Sniff detector
AllenNeuralDynamics/harp.device.sniff-detector
0382: Signal conditioning board for an implanted thermistor
114 parts3MIT
4 layers80 × 100 mm
Harp treadmill
AllenNeuralDynamics/harp.device.treadmill-driver40326: a Harp-compatible device for controlling an instrumented mouse treadmill
- Size
- 80 × 100 mm
- Copper layers
- 4
- Thickness
- 1.57 mm
- Parts
- 173
- Nets
- 129
- Pads
- 580
- Tracks, vias
- 968, 242
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Apr 2023
- Updated
- 8 Sep 2025
Overview
Harp treadmill is an open-source printed circuit board by AllenNeuralDynamics, from the AllenNeuralDynamics/harp.device.treadmill-driver repository on GitHub. It is a 4-layer board of 80 × 100 mm with 173 parts on 129 nets, routed with 968 tracks and 242 vias.
It is built around the RP2040, AD8226BRZ and W25Q16JVUXIQ, with the 74LVCH2T45DC, ADUM4160BRW and LM27762DSS among its other parts. Its parts include 69 capacitors, 42 resistors, 18 diodes, 17 ICs and 7 connectors. It belongs with the RP2040 boards of this library.
Main components
10
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
AD8226BRZ
SOIC-8-40℃~+125℃ 0.4V/us 1 13mA 20nA 350uA 500nV/℃ 50uV 90dB Rail-to-Rail Output SOIC-8 Instrumentation Amplifiers ROHSAnalog DevicesInstrumentation Amplifiers
W25Q16JVUXIQ
USON-8-EP(2x3)-40℃~+85℃ 100,000 cycles 10uA 133MHz 16Mbit 2.7V~3.6V 20 Years 3ms SPI USON-8-EP(2x3) NOR FLASH ROHSWinbond ElecNOR FLASH
74LVCH2T45DC
VSSOP-8-0.5mm-40℃~+125℃ 1 1.2V~5.5V 1.2V~5.5V 2 420Mbps Bidirectional Power-Off Protection Tri-State VSSOP-8-0.5mm Translators, Level Shifters ROHSNexperiaTranslators, Level Shifters
ADUM4160BRW
SOIC16WFull/Low Speed 5 kV USB Digital IsolatorAnalog DevicesUncategorised
LM27762DSS
WSON-12-EP(2x3)-40℃~+85℃ -5V~-1.5V、1.5V~5V 2.5Ω 2.7V~5.5V 250mA 2MHz 390uA Inverted Support WSON-12-EP(2x3) Charge Pumps ROHSTexas InstrumentsCharge Pumps
LP2985-33DBV
SOT-23-5-40℃~+125℃@(Tj) 1 150mA 16V 3.3V 30uVrms 45dB@(1kHz) 575mV@(150mA) 850uA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control、Noise bypass terminal Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TPD2EUSB30DRT
SOT(9x3)-40℃~+85℃ 0.7pF 2 45W 5.5V 5A@8/20us 7V 8V ESD IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT(9x3) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)
1N4007FL
SOD-123FL-65℃~+150℃ 1.1V@1A 1A 1kV 30A 5uA@1kV Independent SOD-123FL Diodes - General Purpose ROHSSMCDiodes - General Purpose
BAT54AW
SOT-323(SC-70)1 Pair Common Anode 1V@100mA 200mA 2uA@25V 30V SOT-323(SC-70) Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
README
README.mdA Harp Device for controlling an instrumented variable-friction mouse treadmill
[!NOTE] This repository contains design files for the electronics assembly. For the mechanical assembly, design files, and bill-of-materials, see the OnShape project.
Features
- linear (no switching!) current control of 12V magnetic brake, Placid Industries B5ZD, datasheet.
- reads measurements from an RTS-10 torque transducer
- wheatstone bridge input for torque transducer
- quadrature encoder input for position/speed measurements
- Harp-protocol compliant over full-speed USB
- accepts Harp time synchronization input.
- reverse-polarity protected power supply.
Register Map
Credits
This board design was created in partnership with the team at Second Order Effects.
Parts
173| Qty | Value | Footprint | References |
|---|---|---|---|
| 35 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C12, C13, C14, C15, C16, C17, C18, C19, C23, C25, C28, C29, C30 +19 |
| 9 | 1uF | Capacitor_SMD:C_0402_1005Metric | C8, C9, C10, C44, C45, C54, C55, C56, C61 |
| 9 | 49.9 | Resistor_SMD:R_0402_1005Metric | R18, R19, R20, R21, R22, R23, R40, R41, R42 |
| 9 | D_TVS | Diode_SMD:D_SOD-882D | D5, D11, D12, D13, D14, D15, D17, D18, D19 |
| 7 | 10K | Resistor_SMD:R_0402_1005Metric | R8, R9, R28, R30, R31, R35, R39 |
| 7 | 10uF | Capacitor_SMD:C_0805_2012Metric | C11, C24, C26, C38, C57, C62, C69 |
| 4 | 100 | Resistor_SMD:R_0402_1005Metric | R16, R17, R24, R25 |
| 4 | 24 | Resistor_SMD:R_0402_1005Metric | R4, R5, R6, R7 |
| 3 | 2.2uF | Capacitor_SMD:C_0402_1005Metric | C49, C51, C60 |
| 3 | 22uF | Capacitor_SMD:C_0805_2012Metric | C39, C40, C52 |
| 3 | 5K1 | Resistor_SMD:R_0402_1005Metric | R2, R3, R26 |
| 3 | AD8615 | Package_TO_SOT_SMD:TSOT-23-5 | U10, U12, U16 |
| 3 | D_Schottky | Diode_SMD:D_SOD-123 | D7, D8, D10 |
| 3 | Fiducial | Fiducial:Fiducial_0.5mm_Mask1mm | FID1, FID2, FID3 |
| 2 | 1.5nF | Resistor_SMD:R_0402_1005Metric | C42, C48 |
| 2 | 100pF | Capacitor_SMD:C_0402_1005Metric | C20, C22 |
| 2 | 10nF | Capacitor_SMD:C_0402_1005Metric | C4, C46 |
| 2 | 10uH | Inductor_SMD:L_Vishay_IHLP-2525 | L2, L3 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R10, R11 |
| 2 | 300pF | Capacitor_SMD:C_0402_1005Metric | C27, C33 |
| 2 | 51K | Resistor_SMD:R_0402_1005Metric | R36, R37 |
| 2 | 680 | Resistor_SMD:R_0402_1005Metric | R12, R13 |
| 2 | ADS7049 | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U8, U9 |
| 2 | D_TVS | Diode_SMD:D_0402_1005Metric | D3, D4 |
| 2 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2 |
| 2 | TestPoint | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | TP1, TP2 |
| 1 | 0.08 | Resistor_SMD:R_1206_3216Metric | R27 |
| 1 | 10 | Resistor_SMD:R_0402_1005Metric | R38 |
| 1 | 1000pF | Capacitor_SMD:C_0402_1005Metric | C21 |
| 1 | 10nF | Capacitor_SMD:C_0603_1608Metric | C64 |
| 1 | 158K | Resistor_SMD:R_0402_1005Metric | R34 |
| 1 | 162K | Resistor_SMD:R_0402_1005Metric | R33 |
| 1 | 1K | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 1K82 | Resistor_SMD:R_0402_1005Metric | R32 |
| 1 | 1N4007FL | Diode_SMD:D_SOD-123F | D6 |
| 1 | 20K | Resistor_SMD:R_Array_Convex_2x0606 | RN1 |
| 1 | 4.7nF | Resistor_SMD:R_0402_1005Metric | C43 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C47 |
| 1 | 499 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15 |
| 1 | 715 | Resistor_SMD:R_0402_1005Metric | R29 |
| 1 | 74LVCH2T45DC | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U15 |
| 1 | 7K5 | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | AD8226 | Package_SO:MSOP-8_3x3mm_P0.65mm | U7 |
| 1 | ADUM4160 | Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm | U3 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ-3524-SMT_Horizontal | J2 |
| 1 | BAT54AW | Package_TO_SOT_SMD:SOT-323_SC-70 | D9 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_CUI_PJ-036AH-SMT_Horizontal | J6 |
| 1 | Conn_01x02_Female | Connector_Phoenix_MC:PhoenixContact_MC_1,5_2-G-3.5_1x02_P3.50mm_Horizontal | J4 |
| 1 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04_Female | Connector_Phoenix_MC:PhoenixContact_MC_1,5_4-G-3.5_1x04_P3.50mm_Horizontal | J7 |
| 1 | Conn_01x05_Female | Connector_Phoenix_MC:PhoenixContact_MC_1,5_5-G-3.5_1x05_P3.50mm_Horizontal | J3 |
| 1 | ECS-TXO-2016 | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | X1 |
| 1 | INA180A4 | Package_TO_SOT_SMD:SOT-23-5 | U11 |
| 1 | LM27762 | Package_SON:WSON-12-1EP_3x2mm_P0.5mm_EP1x2.65_ThermalVias | U13 |
| 1 | LOGO | LOGO | G*** |
| 1 | LP2985-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | LT3506 | Package_DFN_QFN:DFN-16-1EP_4x5mm_P0.5mm_EP2.44x4.34mm | U14 |
| 1 | LTC2641 | Package_SO:MSOP-8_3x3mm_P0.65mm | U17 |
| 1 | L_Coupled_1423 | kicad_component_library:L_CommonModeChoke_TDKCorporation_1210 | L1 |
| 1 | MountingHole_Pad | kicad_component_library:Terminal_Keystone_779x_EdgeMount_Horizontal | H1 |
| 1 | REF2033 | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | RP2040 | kicad_component_library:RP2040-QFN-56 | U4 |
| 1 | Si7336ADP | Package_SO:PowerPAK_SO-8_Single | Q2 |
| 1 | TPD2EUSB30 | Package_TO_SOT_SMD:Texas_DRT-3 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_JAE_DX07S016JA1R1500 | J5 |
| 1 | W25Q16JVUXIQ | kicad_component_library:Winbond-8USON-2x3mm | U5 |
| 1 | ~ | kicad_component_library:SW_Push_1P1T-SH_NO_Vertical_Wuerth_WS-TASV | SW1 |
The 167 most common of 173 parts.
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Questions
How big is the Harp treadmill PCB?
It measures 80 × 100 mm and has 4 copper layers, 1.57 mm thick.
What parts does the Harp treadmill use?
173 parts, built around the RP2040, AD8226BRZ, W25Q16JVUXIQ and 74LVCH2T45DC. 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 Harp treadmill KiCad files?
From the AllenNeuralDynamics/harp.device.treadmill-driver repository on GitHub, at the commit this page was made from: the board is hardware/board/harp_treadmill.kicad_pcb and its schematic hardware/board/encoder_5_to_3v3.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Harp treadmill design in my own project?
Its repository states no licence, so its author keeps all rights: ask AllenNeuralDynamics before reusing the design.