2 layers69.6 × 33.5 mm
2 layers215.3 × 96.5 mm
Test1
Gallan99/smart_gloveA compact smart-glove project for measuring finger bending with five piezoresistive strain sensors. The system combines a custom constant-current analog front end, Arduino data acquisition and a simple Python interface…
- Size
- 215.3 × 96.5 mm
- Copper layers
- 2
- Thickness
- 1.61 mm
- Parts
- 60
- Nets
- 40
- Pads
- 156
- Tracks, vias
- 333, 30
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 23 Aug 2026
- Updated
- 8 Sep 2026
Overview
Test1 is an open-source printed circuit board by Gallan99, from the Gallan99/smart_glove repository on GitHub. It is a 2-layer board of 215.3 × 96.5 mm with 60 parts on 40 nets, routed with 333 tracks and 30 vias.
It is built around the CA3140. Its parts include 22 capacitors, 14 resistors, 9 connectors, 6 ICs and 5 diodes.
Main components
1README
README.mdSmart Glove Strain Sensor System
A compact smart-glove project for measuring finger bending with five piezoresistive strain sensors. The system combines a custom constant-current analog front end, Arduino data acquisition and a simple Python interface for viewing and saving measurements.
Project overview
- Five strain-sensor channels connected to Arduino analog inputs A0-A4.
- Constant-current readout designed for sensors in the megaohm range.
- Resistance calculation, trimmed-mean sampling and IIR filtering on the Arduino.
- Serial data transmission at 115200 baud.
- Python desktop interface for live plotting and measurement logging.
Files
| File | Description |
|---|---|
stable_current_5sensors.ino | Arduino firmware for reading and filtering five strain sensors. |
gui_script_v2.py | Tkinter interface for serial measurements, live plotting and data logging. |
kicad/ | KiCad project containing the schematic and PCB layout of the five-channel board. |
images/ | Photos of the prototype and representative sensor measurements. |
Hardware
The custom board contains five independent sensor-readout channels, a voltage reference, voltage regulation and Bluetooth connectivity.
Open kicad/test1.kicad_pro in KiCad to inspect the complete schematic and PCB design.
Sensor response
The sensors produce a clear resistance change as the fingers bend from 0° to 135°.
Basic use
-
Open
stable_current_5sensors.inoin the Arduino IDE. -
Check the calibration constants
RSET_OHMS,VNODE_VOLTSandADC_REF_VOLTSfor the specific board. -
Upload the firmware to the Arduino and open the serial connection at 115200 baud.
-
Install the Python dependencies:
bash pip install pyserial matplotlib -
Start the desktop interface:
bash python gui_script_v2.py
Note: The Python interface is included in its original single-channel logging form. The Arduino file outputs five sensor channels, so the serial-field selection in the Python parser must be adapted when using the two files together.
Related publication
The complete smart-glove system is described in the following preprint:
Parts
60| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 1kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R6, R8, R10, R12, R13 |
| 6 | 330kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5, R7, R9, R11, R14 |
| 5 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C4, C9, C13, C17, C21 |
| 5 | 10nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C6, C10, C14, C18, C22 |
| 5 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C5, C8, C12, C16, C20 |
| 5 | 47pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C7, C11, C15, C19 |
| 5 | CA3140 | Package_DIP:DIP-8_W7.62mm_LongPads | U1, U3, U4, U5, U6 |
| 5 | Conn_01x02_Pin | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J2, J4, J5, J6, J7 |
| 5 | D_Zener | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5 |
| 4 | , , , | ||
| 1 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2 |
| 1 | 0.33uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 47kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | Conn_01x03 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J9 |
| 1 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J3 |
| 1 | Conn_01x06_Pin | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J8 |
| 1 | L78L05_TO92 | Package_TO_SOT_THT:TO-92_Inline | U2 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J1 |
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Questions
How big is the Test1 PCB?
It measures 215.3 × 96.5 mm and has 2 copper layers, 1.61 mm thick.
What parts does the Test1 use?
60 parts, built around the CA3140. 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 Test1 KiCad files?
From the Gallan99/smart_glove repository on GitHub, at the commit this page was made from: the board is kicad/test1.kicad_pcb and its schematic kicad/test1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Test1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Gallan99 before reusing the design.