Finger strength dynamometer
Dyno is an open-source printed circuit board by drewradcliff, from the drewradcliff/dyno repository on GitHub, published under the MIT licence. It is a 2-layer board of 34 × 32.5 mm with 21 parts on 31 nets, routed with 123 tracks and 12 vias.
It is built around the HX711, CC0603KRX7R9BB104 and CL21A106KAYNNNE, with the B3U-1000P, S2B-PH-SM4-TB(LF)(SN) and KT-0603R among its other parts. Its parts include 7 capacitors, 7 resistors, 2 ICs, 2 connectors and 1 diode. It belongs with the ESP32 and RISC-V boards of this library.
KiCad design for the battery-powered Dyno finger-strength sensor. The board combines a Seeed Studio XIAO ESP32C3 with an HX711 ADC and an external load cell.
Status: early, unverified prototype. The schematic and PCB have not yet been validated on manufactured hardware.
The production directory contains the JLCPCB Gerbers, BOM, and
placement data generated by KiCad's Fabrication Toolkit.
Open dyno.kicad_pro with KiCad 10 or newer.
The original Dyno hardware design is licensed under the repository's MIT License.
The vendored Seeed Studio XIAO KiCad libraries were created by Seeed Studio and
community contributors and are licensed separately under CC BY-SA 4.0. See
libraries/README.md and
libraries/LICENSE-CC-BY-SA-4.0.md.
The design also uses symbols and footprints from the official KiCad libraries, which are distributed under CC BY-SA 4.0 with the KiCad libraries exception. That exception permits their use in electronic designs without requiring the design itself to adopt CC BY-SA.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C5, C6, C7 |
| 2 | 100 | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R4 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric | C3, C4 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 14k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 2.2k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | B3U-1000P | Button_Switch_SMD:SW_SPST_B3U-1000P | SW1 |
| 1 | Battery | Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal | J1 |
| 1 | HX711 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | Load cell (4-wire) | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J2 |
| 1 | MMBT3906LT1G | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | XIAO-ESP32-C3-SMD | Seeed_Studio_XIAO_Series:XIAO-ESP32-C3-SMD | U1 |
It measures 34 × 32.5 mm and has 2 copper layers, 1.6 mm thick.
21 parts, built around the HX711, CC0603KRX7R9BB104, CL21A106KAYNNNE and B3U-1000P. 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.
From the drewradcliff/dyno repository on GitHub, at the commit this page was made from: the board is hardware/dyno.kicad_pcb and its schematic hardware/dyno.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
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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