2 layers72.1 × 78.5 mm
2 layers40 × 28.6 mm
Lever
Karpova-Lab/leverRetractable lever for rat behavior experiments
- Size
- 40 × 28.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 10
- Pads
- 45
- Tracks, vias
- 62, 8
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 Sep 2020
- Updated
- 25 Nov 2025
Overview
Lever is an open-source printed circuit board by Karpova-Lab, from the Karpova-Lab/lever repository on GitHub. It is a 2-layer board of 40 × 28.6 mm with 12 parts on 10 nets, routed with 62 tracks and 8 vias.
It is built around the ATTINY84-20SSU. Its parts include 3 connectors, 2 capacitors, 1 resistor, 1 IC and 1 diode. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
readme.mdRetractable Lever
This repository contains design files for a retractable lever used in behavioral neuroscience experiments.
Full documentation can be found at https://karpova-lab.github.io/lever/
Feedback and questions can be submitted to discussions.
License
This project is licensed under the Janelia open-source hardware license and Janelia 3-term BSD open-source software license.
Please contact innovation@janelia.hhmi.org if you have any questions about licensing or would like to use this project commercially.
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3 |
| 1 | 0.1µF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C1 |
| 1 | 10KΩ | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1 |
| 1 | 470 µF | Capacitor_SMD:CP_Elec_6.3x4.9 | C2 |
| 1 | ATtiny84-20SSU | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | AVR_ISP | asl_footprints:AVR_ISP | X1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | RJ45_pyControl | asl_footprints:RJ45_SMD_Vertical | J1 |
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Questions
How big is the Lever PCB?
It measures 40 × 28.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lever use?
12 parts, built around the ATTINY84-20SSU. 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 Lever KiCad files?
From the Karpova-Lab/lever repository on GitHub, at the commit this page was made from: the board is pcb/lever.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lever design in my own project?
Its repository states no licence, so its author keeps all rights: ask Karpova-Lab before reusing the design.