4 layers82.8 × 33 mm
E ink watch
sandgum/Triangulate-ES_01-Watch
A 5mm thick smartwatch which uses an E-ink display and two OLEDs to display information while consuming very little power
162 parts22
2 layers100 × 60 mm
Electronics semester project 2
- Size
- 100 × 60 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 57
- Pads
- 151
- Tracks, vias
- 230, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 28 Mar 2025
- Updated
- 2 Jun 2025
Overview
SPRO2 is an open-source printed circuit board by milanovviktorio, from the milanovviktorio/SPRO2 repository on GitHub. It is a 2-layer board of 100 × 60 mm with 50 parts on 57 nets, routed with 230 tracks and 0 vias.
It is built around the MAX30102. Its parts include 21 resistors, 13 capacitors, 4 ICs, 4 diodes and 2 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdSPRO2
Electronics semester project 2
Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C1, C3, C4, C11, C13 |
| 4 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R11, R12, R14 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R4, R9, Rg1 |
| 4 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4 |
| 4 | 200k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16, R17, R18, R20 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 100u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C7, C8, C9 |
| 2 | 1.5u | Capacitor_THT:C_Rect_L13.0mm_W5.0mm_P10.00mm_FKS3_FKP3_MKS4 | C10, C12 |
| 2 | 240 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R13 |
| 2 | 4.7µF | Capacitor_THT:CP_Radial_D7.5mm_P2.50mm | C2, C5 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R19 |
| 1 | 150k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | Rf1 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 2.2u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C6 |
| 1 | 200 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 22k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 43k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15 |
| 1 | 91k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | Humidity sensor | SPRO_lib:connector_2p | J2 |
| 1 | LM35-LP | SPRO_lib:connector_3p | U1 |
| 1 | MAX30102 | SPRO_lib:connector_4p | J1 |
| 1 | OPA340P | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | TL074 | SPRO_lib:DIP794W53P254L1930H508Q14N | U3 |
| 1 | ~ | Package_DIP:DIP-8_W7.62mm | U4 |
Questions
How big is the SPRO2 PCB?
It measures 100 × 60 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SPRO2 use?
50 parts, built around the MAX30102. 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 SPRO2 KiCad files?
From the milanovviktorio/SPRO2 repository on GitHub, at the commit this page was made from: the board is Hardware/PCB/spro2/spro2.kicad_pcb and its schematic Hardware/PCB/spro2/hum_amp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SPRO2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask milanovviktorio before reusing the design.
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