4 layers80 × 50 mm
Harp.device.lickety split
AllenNeuralDynamics/harp.device.lickety-split
0360: an ephys-compliant capacitive lick detector
193 parts5MIT
4 layers39.9 × 28 mm
Environment sensor
AllenNeuralDynamics/harp.device.environment-sensor0357: harp-compliant humidity, pressure, and temperature sensor
- Size
- 39.9 × 28 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 56
- Nets
- 61
- Pads
- 221
- Tracks, vias
- 336, 75
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 6 Sep 2023
- Updated
- 7 Nov 2025
Overview
Environment sensor is an open-source printed circuit board by AllenNeuralDynamics, from the AllenNeuralDynamics/harp.device.environment-sensor repository on GitHub, published under the MIT licence. It is a 4-layer board of 39.9 × 28 mm with 56 parts on 61 nets, routed with 336 tracks and 75 vias.
It is built around the RP2040, BME688 and W25Q16JVUXIQ, with the RT6150B-33GQW, TPD2EUSB30DRT and BAT54J among its other parts. Its parts include 21 capacitors, 10 resistors, 5 ICs, 5 diodes and 2 connectors. It belongs with the sensors and measurement boards and the RP2040 boards of this library.
Main components
6
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
BME688
SMD-8P-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 2.1uA I2C、SPI ±0.5℃ ±3%RH SMD-8P Temperature and Humidity Sensor ROHSBosch SensortecTemperature And Humidity Sensor
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
RT6150B-33GQW
WDFN-10(2.5x2.5)-40℃~+125℃@(TJ) 1 1.8V~5.5V 3.3V 60uA 800kHz~1.2MHz 800mA Buck-Boost Buck-Boost Built-in Fixed Yes WDFN-10(2.5x2.5) DC-DC Converters ROHSRichtek TechDC-DC Converters
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)
BAT54J
SOD-323F1 Independent 200mA 2uA@25V 30V 600mA 800mV@100mA SOD-323F Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.mdA self-contained, harp-compliant environment sensor
Features
- pressure sensing
- temperature sensing
- humidity sensing
- USB powered
- Harp synchronization input
Wiring Diagram
TODO
Device Pinout
TODO
Wiring Diagram
TODO
Theory of Operation
TODO: awesome diagram {here}
Harp Register Map
Parts
56| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 100nF | Capacitor_SMD:C_0402_1005Metric | C2, C6, C8, C13, C14, C15, C16, C17, C18, C19, C20, C24, C25 |
| 6 | Fiducial | Fiducial:Fiducial_0.5mm_Mask1mm | FID1, FID2, FID3, FID4, FID5, FID6 |
| 4 | 1uF | Capacitor_SMD:C_0402_1005Metric | C9, C10, C11, C26 |
| 2 | 100K | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C3, C12 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R9, R10 |
| 2 | 330 | Resistor_SMD:R_0402_1005Metric | R11, R12 |
| 2 | 5K1 | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | D_TVS | Diode_SMD:D_0402_1005Metric | D1, D2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3, D4 |
| 1 | 10K | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 10nF | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 1K | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 2.2uH | Inductor_SMD:L_0603_1608Metric | L2 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ-3524-SMT_Horizontal | J2 |
| 1 | BAT54J | Diode_SMD:D_SOD-323F | D5 |
| 1 | BME688 | Package_LGA:Bosch_LGA-8_3x3mm_P0.8mm_ClockwisePinNumbering | U5 |
| 1 | ECS-TXO-2016 | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | X1 |
| 1 | RP2040 | kicad_component_library:RP2040-QFN-56 | U3 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_B3U-1000P | SW1 |
| 1 | TPD2EUSB30 | Package_TO_SOT_SMD:Texas_DRT-3 | U1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_JAE_DX07S016JA1R1500 | J3 |
| 1 | W25Q16JVUXIQ | kicad_component_library:Winbond-8USON-2x3mm | U4 |
| 1 | rt6150b-33gqw | kicad_component_library:WDFN-10-1EP_2.5x2.5mm_P0.5_EP1.25x2.1mm | U6 |
The 52 most common of 56 parts.
Questions
How big is the Environment sensor PCB?
It measures 39.9 × 28 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Environment sensor use?
56 parts, built around the RP2040, BME688, W25Q16JVUXIQ and RT6150B-33GQW. 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 Environment sensor KiCad files?
From the AllenNeuralDynamics/harp.device.environment-sensor repository on GitHub, at the commit this page was made from: the board is hardware/board/environment_sensor/environment_sensor.kicad_pcb and its schematic hardware/board/environment_sensor/environment_sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Environment sensor 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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